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Download full-text PDF ResearchGate has not been able to resolve any references for this publication. The self-cleansing intrusion tolerant system (SCITS) is a typical application of this technology. Through quantifying the redundancy of SCITS, a conclusion that a specific SCITS has an optimal redundancy which can maximize its intrusion tolerant performance is obtained in this paper. Lastly some notes about the design of SCITS are given based on the simulation. Read more Conference Paper Quasi-static finite-element analysis for MEMS transmission lines February 1999 Wang Ying Zhu Shouzheng Lai Zongsheng Microelectromechanical systems (MEMS) technology is considered to be one of key technologies in the coming century. In this paper, the quasi-static finite element method (FEM) is applied to analyze a kind of MEMS microwave transmission line, the finite-grounded coplanar waveguide. The capacitance per unit length and intrinsic impedance of the line are derived. Considering the AC current ripple, this study introduced a general DC-link current real-time prediction method for three-phase two-level voltage inverters (three-phase 2L-VSI) using the pulse width modulation. Meanwhile, accurate calculation of RMS current on the DC-link capacitor has been provided. Simulation results and experimental results are provided to support the analysis and proposed method. Read more Discover more Download citation What type of file do you want. RIS BibTeX Plain Text What do you want to download. Citation only Citation and abstract Download ResearchGate iOS App Get it from the App Store now. Install Keep up with your stats and more Access scientific knowledge from anywhere or Discover by subject area Recruit researchers Join for free Login Email Tip: Most researchers use their institutional email address as their ResearchGate login Password Forgot password. Keep me logged in Log in or Continue with LinkedIn Continue with Google Welcome back. http://detalinternational.com/userfiles/brother-ml-300-manual-espa-ol.xml
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Keep me logged in Log in or Continue with LinkedIn Continue with Google No account. All rights reserved. Terms Privacy Copyright Imprint. If the branch determines that products or systems provide efficiencies and meet stringent performance requirements, those components are incorporated into the Forest Service Bridge Design and Construction Manual as acceptable ministry standards. Where an unapproved structure or system is being considered for a project before the branch has completed its review and acceptance of such structures, contact the Ministry Engineer for input into the implementation requirements. Note that these rules of thumb are for completed in-place structures which consider both the materials and installation costs for the finished product. For example, materials for an application may be cheaper than some others, but the finished structure may cost more due to higher installation costs: They are particularly conducive where there are alignment issues such as skews or extra width is required to accommodate vehicle tracking on curves. Precast concrete slabs are extremely heavy, and as such are expensive to ship and difficult to launch. The equipment that will be used to launch and place them must be considered when selecting component size in the design phase. They can be set up to allow for bolted deck connections, providing for bridge removal and use elsewhere. Concrete composite deck panel installation involves grout work that requires attention to quality control, is labour-intensive and time-consuming, and the deck panels are not easy to dismantle. Generally, all steel portable superstructures are much more expensive than other options. All steel portables are recommended only where they are being utilized for temporary situations and moved from site to site. When determining the substructure options for a particular site, base the selection on the type of superstructure, operational requirements, and specific-site conditions. http://www.cheap-parceldelivery.com/userfiles/brother-model-fax-2820-manual.xml
The Forest Service Bridge Design and Construction Manual presents numerous permanent bridge substructures standards. The standard design drawings in the manual typically consist of precast concrete spread footings and are suitable where adequate soil bearing can be obtained. The standard drawings also provide for “T” footings, suited to concrete slab girder superstructures requiring shallow abutments; and steel pipe columns on precast footing standards, suited to steel girder superstructures and concrete slab superstructure requiring higher abutments. I can help you find COVID-19 related information. I'm still learning, so please be patient with my responses. Please don't enter personal information. Read more about Privacy. Questions about the collection of information can be directed to the Manager of Corporate Web, Government Digital Experience Division. Superstructures include: flat slabs, adjacent box beams, pretensioned beams, spliced and curved girders. Whereas substructures include: precast end bents, piles and pile bent caps, water line pile caps, and precast columns. Learn more about the specific precast components. Beam Sections and Properties. PCI has developed and proven common Super Structure systems and Beam Shapes and section properties:The below chart is a sample of those products. The charts can be accessed in Preliminary LRFD Design Charts which you can download below. The manual is based on the American Association of State Highway Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications Fourth Edition, 2007. Design examples and commentary throughout the manual are intended to serve as a guide to aid bridge structural design engineers with the implementation of the AASHTO LRFD Bridge Design Specifications, and is presented in both U.S. Customary Units and Standard International Units. This manual is comprised of four volumes. http://www.drupalitalia.org/node/76661
Volume 1 covers general steel and concrete superstructure design considerations including the history of bridge design, loads and load combinations, deck design, and bearing design. Volume 3 covers the design and construction of simple and continuous composite concrete bridge superstructures concentrating on precast pretensioned girders, girder continuity by means of reinforced concrete joints and post-tensioning, and cast-in-place post-tensioned superstructures. Volume 4 provides detailed superstructure design examples which support the text in Volumes 1 through 3. The four design examples covered in Volume 4 include: a straight steel girder superstructure with no skew, a straight steel girder superstructure with a skew, a steel tub girder superstructure, and a concrete I-girder superstructure. AASHTO references are provided throughout each volume. All Rights Reserved. Terms of Use and Privacy Statement. January 24, 2014CRC PressFebruary 9, 2014CRC PressWhere the content of the eBook requires a specific layout, or contains maths or other special characters, the eBook will be available in PDF (PBK) format, which cannot be reflowed. For both formats the functionality available will depend on how you access the ebook (via Bookshelf Online in your browser or via the Bookshelf app on your PC or mobile device). This extensive collection highlights bridge engineering specimens from around the world, contains detailed information on bridge engineering, and thoroughly explains the concepts and practical applications surrounding the subject. It offers design concepts, specifications, and practice, as well as the various types of bridges. The text includes over 2,500 tables, charts, illustrations, and photos. The book covers new, innovative and traditional methods and practices; explores rehabilitation, retrofit, and maintenance; and examines seismic design and building materials. http://artcustomdrums.com/images/bridge-engineering-manual.pdf
He earned his BS in civil engineering from the National Cheng-Kung University, Taiwan, in 1959, MS in structural engineering from Lehigh University in 1963, and PhD in solid mechanics from Brown University in 1966. His interests include constitutive modeling of engineering materials, soil and concrete plasticity, structural connections, and structural stability, and he has received several national engineering awards. In 1995, he was elected to the U.S. National Academy of Engineering. Dr. Chen has authored and coauthored more than 20 engineering books and 500 technical papers. He is editor-in-chief for the Civil Engineering Handbook, the Handbook of Structural Engineering, the Earthquake Engineering Handbook, and the Handbook of International Bridge Engineering (CRC Press). He earned his diploma in civil engineering in 1975, MS in structural engineering in 1981 from Taiyuan University of Technology, China, and PhD in structural engineering from Purdue University in 1990. His interests include inelastic behavior of reinforced concrete and steel structures, structural stability, seismic bridge analysis, and design. Dr. Duan has authored and coauthored more than 70 papers, chapters, and reports, and is the coeditor of the Handbook of International Bridge Engineering (CRC Press). He has received several awards, including the prestigious 2001 Arthur M. Wellington Prize from the American Society of Civil Engineers. Get started with a FREE account. The surprise is the only way to new discoveries. Be playful! ” ? Gordana Biernat Example of HS20-44.Part 2: Concrete Bridges (Designers' Guides to the Eurocodes) Part 2: Concrete Bridges ( Designers ' Guides.The manual is based on the AASHTO LRFD Bridge Design.Retooling manufacturing: bridging design, materials, and productio.Get books you want. To add our e-mail address ( ), visit the Personal Document Settings under Preferences tab on Amazon. The 13-digit and 10-digit formats both work. Please try again.Please try again. https://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/162876f6588ab0---caiman-mrap-manual.pdf
This extensive collection highlights bridge engineering specimens from around the world, contains detailed information on bridge engineering, and thoroughly explains the concepts and practical applications surrounding the subject. Published in five books: Fundamentals, Superstructure Design, Substructure Design, Seismic Design, and Construction and Maintenance, this new edition provides numerous worked-out examples that give readers step-by-step design procedures, includes contributions by leading experts from around the world in their respective areas of bridge engineering, contains 26 completely new chapters, and updates most other chapters. It offers design concepts, specifications, and practice, as well as the various types of bridges. The text includes over 2,500 tables, charts, illustrations, and photos. The book covers new, innovative and traditional methods and practices; explores rehabilitation, retrofit, and maintenance; and examines seismic design and building materials. The second book, Superstructure Design, contains 19 chapters, and covers information on how to design all types of bridges.Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Register a free business account He earned his BS in civil engineering from the National Cheng-Kung University, Taiwan, in 1959, MS in structural engineering from Lehigh University in 1963, and PhD in solid mechanics from Brown University in 1966. His interests include constitutive modeling of engineering materials, soil and concrete plasticity, structural connections, and structural stability, and he has received several national engineering awards. In 1995, he was elected to the U.S. National Academy of Engineering. Dr. Chen has authored and coauthored more than 20 engineering books and 500 technical papers. www.crossroadscounselingcenters.com/ckfinder/userfiles/files/came-gard-4000-manual.pdf
He is editor-in-chief for the Civil Engineering Handbook, the Handbook of Structural Engineering, the Earthquake Engineering Handbook, and the Handbook of International Bridge Engineering (CRC Press). Dr. Lian Duan is a senior bridge engineer and structural steel committee chair with the California Department of Transportation (Caltrans). He earned his diploma in civil engineering in 1975, MS in structural engineering in 1981 from Taiyuan University of Technology, China, and PhD in structural engineering from Purdue University in 1990. His interests include inelastic behavior of reinforced concrete and steel structures, structural stability, seismic bridge analysis, and design. Dr. Duan has authored and coauthored more than 70 papers, chapters, and reports, and is the coeditor of the Handbook of International Bridge Engineering (CRC Press). He has received several awards, including the prestigious 2001 Arthur M. Wellington Prize from the American Society of Civil Engineers. Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness. Sorry, we failed to record your vote. Please try again In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. We publish prepublications to facilitate timely access to the committee's findings. You can pre-order a copy of the book and we will send it to you when it becomes available. We will not charge you for the book until it ships. Pricing for a pre-ordered book is estimated and subject to change. All backorders will be released at the final established price. If the price decreases, we will simply charge the lower price. Applicable discounts will be extended. {-Variable.fc_1_url-
The eBook is optimized for e-reader devices and apps, which means that it offers a much better digital reading experience than a PDF, including resizable text and interactive features (when available). It also explores procedures that can be used to estimate the expected remaining life of reinforced concrete bridge superstructure elements and to determine the effects of maintenance and repair options on their service life. NCHRP Web-Only Document 88 contains the data used in the development and validation of the service life model described in NCHRP Report 558. Also, the computational software (Excel spreadsheet) for the service life estimation process is available. Washington, DC: The National Academies Press. You may request permission to: Terms of Use and Privacy Statement. The last is often the most challenging. This chapter discusses the practical challenges associated in the selection of highway bridge types, the bridge types that are available for use and their range of applicability, the methods of analysis used, the dominant design method in use today, and finally, an example based on the Eurocodes of a bridge design following the practical considerations given here. A source for an in-depth, step-by-step design example of a highway bridge design based on the Eurocode is also included. View chapter Purchase book Read full chapter URL: Loads on bridges A. Nowak, A. Pipinato, in Innovative Bridge Design Handbook, 2016 2.2.2 Traffic loads: AASHTO Highway bridge design loads are established by the American Association of State Highway and Transportation Officials (AASHTO). For many decades, the primary bridge design code in the United States has been the AASHTO “Standard Specifications for Highway Bridges” (Specifications), as supplemented by agency criteria as applicable. During the 1990s, AASHTO developed and approved a new bridge design code, entitled “AASHTO LRFD Bridge Design Specifications” ( AASHTO, 2014 ). http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/162876f7ff0034---cain-u0026-abel-manual-download.pdf
It is based upon the principles of load and resistance factor design (LRFD). Section 3 deals with Loads and Load Factors and includes information on permanent loads (dead load and earth loads), live loads (vehicular load and pedestrian load), and other loads (wind, temperature, earthquake, ice pressure and collision forces). The live load is assumed to occupy 10.0 ft width within a design lane. The total live load effect resulting from multilane traffic can be reduced for sites with lower ADTT using the multilane reduction factors. The live load model, consisting of either a truck or tandem coincident with a uniformly distributed load, was developed as a notional representation of a group of vehicles routinely permitted on highways in various states under “grandfather” exclusions to weight laws. The vehicles considered to be representative of these exclusions were based on a study conducted by the Transportation Research Board ( Cohen, 1990 ). The load model is called “notional” because it is not intended to represent any particular truck. The weights and spacing of axles and wheels for the design truck is as specified in Figure 4. A dynamic load allowance is to be considered by increasing the static effects of the design truck or tandem, other than centrifugal and braking forces, by 33 of the truck load effect. That percentage is 75 for deck joints and 15 for fatigue and fracture limit state. The spacing between two 32.0-kip axles can vary between 4,3 m(14.0 ft) and 9 m (30.0 ft) to produce the extreme force effect. Transversely, the design lane load is assumed to be uniformly distributed over a 3.05 m (10.0 ft) width. The force effects from the design lane load are not be subject to a dynamic load allowance. Figure 2.4. Characteristics of the design load ( AASHTO 2014 ). The definition of the bridge design process, the various steps required, and the bureaucratic procedures involved are unnecessary to explain in this context. www.crea-solution.com/ckfinder/userfiles/files/came-garage-door-manual.pdf
Instead, it should be stated that the bridge is a complex structure that introduces into the surrounding landscape relevant variations, dealing with a number of specialist fields: for example, hydraulic, geotechnical, landscaping, structural, architectural, economic, and socio-political. For this reason, before starting the design of a bridge, a concept should be developed, with the realization of a scaled model, as a simulation of the three-dimensional (3D) overview of the construction and of all the considered alternatives. From this initial concept, some parametric considerations need to be performed to estimate the costs. This preliminary analysis is the basis for an open discussion with the client, the managing agencies, and any relevant local government agency on the most suitable solution. Only when the costs and the concept will be shared can the design stage start: the successive steps of the preliminary plan, finally culminating in a construction project that deals with the actual erection of the bridge. For large-scale projects, the preliminary stage includes economic and financial studies as well. It should be known that the large number of variables included in the design stage are mostly not fixed, as they depend on the precise place and time of the realization: e.g., there is not the best finite element method (FEM); rather, the FEM software most suitable for the specific bridge design must be chosen, and the same applies to codes and standards, the amount of human resources, and the hardware instrumentation required. The best project is a perfect mix of these various components. Surely, a good project must include an architectural consciousness, the structural engineering knowledge, the professional experience, and a strong informatic infrastructure. View chapter Purchase book Read full chapter URL: Life cycle assessment (LCA) of ultra high performance concrete (UHPC) structures T. Stengel, P. Schie? l, in Eco-efficient Construction and Building Materials, 2014 22.5.3 Precast single span bridge girder (bridge design model) Two traffic bridge design models having one 45 m single span were analysed (see Almansour and Lounis, 2008 ). The deck slab is made of normal concrete in both cases. The bridge design was performed according to the Canadian Highway Bridge Design Code ( Almansour and Lounis, 2008 ). The requirements include no cracking (i.e., fully prestressed) at serviceability limit state (SLS). One model was designed for the use of normal concrete with a compressive strength of 40 MPa for the girders, whereas the second model was designed for the use of UHPC with a compressive strength of 175 MPa for the girders. In both cases, low-relaxation strands grade 1,860 with a nominal diameter of 12.7 mm and a nominal cross-sectional area of 98.7 mm 2 were used ( Almansour and Lounis, 2008 ). About 55 of the strands were arranged in straight tendons, whereas the remaining 45 were conventional deflected strand pattern groups ( Almansour and Lounis, 2008 ). The deck slab thickness was 175 mm for both bridges. A normal concrete with a compressive strength of 30 MPa was used for the deck slab ( Almansour and Lounis, 2008 ). It was found that in the case of normal concrete, five so-called CPCI-1600 girders with a height of 1.6 m and a cross-sectional area of 0.499 m 2 are needed (see Almansour and Lounis, 2008 ). A mean ratio of 11.5 was chosen for this study. No information on normal reinforcement was provided in Almansour and Lounis (2008). A mean composition of the 40 MPa normal concrete as listed in Table 22.20 was taken into account. A total amount of 110.98 m 3 concrete is necessary for the five girders. A total amount of 10,135.6 kg strands was used for the five girders. A haulage distance of 30 km to the construction site was taken into consideration for the precast girders. A distance of 30 km to the construction site was taken into consideration for the ready-mix concrete. For the bridge made of UHPC, only four CPCI-1200 girders are needed (see Almansour and Lounis, 2008, and Fig. 22.14 ). The height of a girder is 1.2 m, the cross-sectional area is 0.320 m 2 (see Almansour and Lounis, 2008 ). No information on normal reinforcement was provided in Almansour and Lounis (2008). A mean composition of UHPC as mentioned above was taken into account. A total amount of 56.19 m 3 concrete is necessary for the four girders. The distance to the prefabrication plant was chosen to be 20 km for silica sand and quartz flower, 150 km for Portland cement and silica fume and 300 km for superplasticizer and micro steel fibres. A 28 t lorry was considered to perform all the haulage. A total amount of 11,077.9 kg of strands was used for the four girders. The strands were modelled as given above. 22.14. Cross section of the UHPC traffic bridge design model. The normal concrete deck slab was modelled as described before. The results obtained by the LCA for the two bridge design models are given in Table 22.21. The normalized ecological fingerprint of the two bridge design models is shown in Fig. 22.15. To normalize the diagram, the results of the normal concrete bridge design model were set to 1. Despite the fact that in the case of the UHPC bridge design model only half the amount of concrete was needed for the girders, it can be seen that using a mean UHPC results in a significantly higher ecological impact compared to normal concrete. The impact categories for the UHPC used in this study are between 1.5-fold and 2.4-fold higher with respect to the normal concrete design model. The ecological impact of the normal concrete bridge design model is mainly (between 65 and 92) due to the girders. In the case of GWP, POCP, AP and NP, the normal concrete together with the prestressing strands account for more than 50 of the impact of the girders. Haulage of raw materials and the girders is only important for ODP. The haulage of ready-mix concrete for the deck slab is less than 10 of the overall impact. Within the girders, the highest contribution comes from the UHPC. The POCP is mainly caused by the production of PCE based high-performance superplasticizer. The use of UHPC with a high cement and a high micro steel fibre content as in this study did not yield a more environmentally friendly bridge construction. The ecological impact of the UHPC could be lowered significantly by reducing the amount of Portland cement as in Gerlicher et al. (2008) and Stengel (2008) and by reducing or exchanging the micro steel fibres as far as possible. A reduction of 50 of the UHPC’s ecological impact would lead to an overall ecological impact of the UHPC bridge design model in the range of the normal concrete design model. However, it should be kept in mind that according to the current literature, UHPC shows a better durability when compared to normal concrete. Denarie et al. (2009) assumed a service life of a bridge rehabilitation using UHPC at least twice that of normal concrete. Therefore a longer service life of the structure can be expected when using UHPC. This may compensate the higher ecological impact of the raw materials used. Besides this, the girders are designed according to current design codes and methods. Using a design method appropriate for the material involved may also result in a more efficient structure. View chapter Purchase book Read full chapter URL: Bridge Planning and Design Weiwei Lin, Teruhiko Yoda, in Bridge Engineering, 2017 2.7.5 Bridge Specifications in China Two series of bridge design specifications are used in China, including design specifications for highway bridges and design specifications for railway bridges. Six parts are included in the design specifications for highway bridges in 1989. In the specifications, both load and resistance factor design (LRFD) theory for reinforced prestressed concrete members and ASD theory for steel and timber members are adopted. ( Li and Xiao, 2000 ). In 1999, the national standard for Reliability Design of Highway Engineering Structures was published in China. These codes have also been revised for several times, and the LFRD design code was also adopted in the design of Ground Base and Foundation of Highway Bridges and Culvert. ( Qin et al., 2013 ). View chapter Purchase book Read full chapter URL: Rapid Bridge Insertions Following Failures Mohiuddin Ali Khan Ph.D., M.Phil., DIC, P.E., in Accelerated Bridge Construction, 2015 6.11.5 Review of AASHTO LRFD bridge design specification (2007) and other key specifications There are several bridge design codes that specify requirements for curved I-girders during construction. The following paragraphs discuss the stated requirements of several codes and include the preferred practices for the state of Texas. 1. Section 2.5.3 discusses the design objectives during construction. “Constructibility issues should include, but not be limited to, consideration of deflection, strength of steel and concrete, and stability during critical stages of construction.” 2. Chapter 4 is dedicated to the structural analysis of bridges, and Section C 4.6.1.2.1 states: “Bracing members are considered primary members in curved bridges since they transmit forces necessary to provide equilibrium.” “ Curved I-girders are prone to deflect laterally when the girders are insufficiently braced during erection. This behavior may not be well recognized by small-deflection theory. Classical methods of analysis usually are based on strength of materials assumptions that do not recognize cross-section deformation. The extra width for curved girders enhances handling stability and helps keep lateral bending stresses within reason. ” The Preferred Practices also state that “flange width affects girder stability during handling, erection, and deck placement. This report, titled Steel Bridge Erection Practices: A Synthesis of Highway Practices, documents a survey sent to state departments of transportation, contractors, and fabricators. Top flange bracing: Structural analysis should be performed to make sure that the girder does not translate a significant amount when the lifting crane is released. View chapter Purchase book Read full chapter URL: Bridge Noise David Thompson, in Railway Noise and Vibration, 2009 11.5.6 Closed structures Figure 11.26 compares two bridge designs. On the left is an open girder consisting of a deck plate and two webs, while on the right a box girder is shown which is closed by a bottom plate and also by plates at either end. For a closed structure, such as this box girder, the sound radiation from the inner surfaces is contained within the structure. This has the effect of reducing the effective radiating area by up to a factor 2, and hence the radiated sound power by 3 dB. The structure must be completely closed, however, as otherwise the noise from the inner surfaces could escape through any gaps. FIGURE 11-26. Typical open and closed girder designs View chapter Purchase book Read full chapter URL: Modular Bridge Construction Issues Mohiuddin Ali Khan Ph.D., M.Phil., DIC, P.E., in Accelerated Bridge Construction, 2015 5.4.1 Introduction There are several types of rapid construction technologies currently used in the United States. For bridges above waterways, the construction time is also reduced; thus the amount of debris that falls from the construction site is reduced, which in turn reduces the environmental impact. FIGURE 5.1. View of a semitrailer traveling to the site for erection by crane. The widely used PCI Bridge Design Manual provides concrete girder shapes with standard dimensions and properties of typical sections.
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