Download or read book Seismic Response of Precast Bridge Columns with Energy Dissipating Joints written by Sarira Motaref and published by . This book was released on 2011 with total page 707 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Precast Bridge Columns with Energy Dissipating Joints written by Sarira Motaref and published by . This book was released on 2011 with total page 707 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Concrete Bridges written by Kosalram Krishnan and published by . This book was released on 1999 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precast Segmental Post tensioned Concrete Bridge Columns for Seismic Regions written by Yu-Chen Ou and published by . This book was released on 2007 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simplified analytical model for static pushover analysis and a three-dimensional detailed finite element model for cyclic analysis of the proposed bridge columns are developed in this research. In addition, a stiffness degrading hysteretic model is proposed for response-history analysis. With the analytical models, a parametric study is conducted to examine the seismic performance of the proposed columns with different design parameters.

Download or read book Seismic Performance of Precast Concrete Dual shell Steel Columns for Accelerated Bridge Construction written by Gabriele Guerrini and published by . This book was released on 2014 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents an innovative bridge column technology for application in seismic regions. The proposed technology combines a precast post-tensioned composite steel-concrete hollow-core column with supplemental energy dissipation, in a way to reduce on-site construction burdens and minimize earthquake-induced residual deformations, damage, and associated repair costs. The column consists of two steel cylindrical shells, with high-performance concrete cast in between. Both shells act as permanent formwork; the outer shell substitutes the longitudinal and transverse reinforcement, as it works in composite action with the concrete, whereas the inner shell removes unnecessary concrete volume from the column, prevents concrete implosion, and prevents buckling of energy dissipating dowels when embedded in the concrete. Large inelastic rotations can be accommodated at the end joints with minimal structural damage, since gaps are allowed to open at these locations and to close upon load reversal. Longitudinal post-tensioned high-strength steel threaded bars, designed to respond elastically, in combination with gravity forces ensure self-centering behavior. Internal or external steel devices provide energy dissipation by axial yielding. This dissertation reviews the main principles and requirements for the design of these columns. The experimental findings from two quasi-static reversed cyclic tests are then presented, and numerical simulations of the experimental response are proposed.

Download or read book Seismic Performance of Stainless and Conventional Steel Energy Dissipation Bars in Precast Segmental Bridge Columns written by Yihui Zhou and published by . This book was released on 2011 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of stainless steel reinforcing bars in seismic applications has recently attracted much attention in the civil engineering community due to its superior material properties, including high corrosion resistance and high specific strength. However, as with all new materials, a number of shortcomings are unavoidable, such as high initial costs, unknown low-cycle fatigue behavior, uncertain ductility properties and unidentified bond-slip behavior between the embedded bar and grouted duct in precast concrete element for use in segmental bridge members. The performance of precast segmental post-tensioned concrete bridge columns in seismic regions has been investigated by many other researchers. Mild steel energy dissipation bars (ED bars) that were continuous across the column segment joints were added into the columns to increase the hysteretic energy dissipation capacity.^In phase Iexperimental study, mechanical properties and low-cycle fatigue behavior of Talley S24100, Talley 316LN, Talley 2205 and Arminox UNS S32304 stainless reinforcing steel, A706 carbon black reinforcing steel, and MMFX II high strength, corrosion resistant reinforcing steel were investigated. Talley S24100 was found to obtain the highest ductility and the best low-cycle fatigue performance among the steels investigated. Therefore, compared to A706, Talley S24100 was considered to be the superior substitute material for ED bars. Succeeding phase II and phase III study on the bond-slip response of stainless steel reinforcing bars in grouted ducts of precast concrete element was then carried out with a focus on the influence of various duct/bar diameter ratios and different embedment lengths.^A seriesof monotonic pull-out and tension cyclic tests were conducted to investigate the constitutive bond-slip relationship between the bar and duct confined grout and their further applications under seismic loadings. Results showed that for A706 and Talley S24100 steels, both the duct/bar diameter ratio and embedment length influenced the bond-slip behavior in the monotonic pull-out tests. A one-dimensional nonlinear bond spring model exhibited a good performance in simulating the test results. In addition to the conventional bond-slip model, an "end-slip model" is also proposed in this study to describe the loaded end slip behavior of a bar anchored in grouted duct with a relatively deep embedment (12,16and 24 db). Each bond-slip and end-slip model has a five segment structure (each segment is linear). Recommended design equations were developed for development lengths for A706 and Talley S24100 reinforcing steels, respectively.^The local ED bar strains at different column top drift levels were investigated.

Download or read book Seismic Response of Unbonded Post tensioned Precast Concrete Segmental Bridge Columns written by Joshua Tyler Hewes and published by . This book was released on 2000 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Analysis and Design of Precast Concrete Segmental Bridges written by Petros Sideris and published by . This book was released on 2012 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, the concept of hybrid sliding-rocking (HSR) precast concrete post-tensioned segmental members for seismic applications in bridges is introduced and investigated experimentally and numerically. The HSR members lie into the framework of accelerated bridge construction techniques (ABC) and are primarily intended for applications in moderate and high seismicity areas. The HSR members combine two fundamental components, namely the HSR segmental joints, and the internal unbonded post-tensioning. The HSR joints utilize relative segment-to-segment sliding (joint sliding) and gap opening (joint rocking) to mitigate the applied seismic loading. Joint sliding offers high energy dissipation with minor structural damage as well as moderate self-centering. On the other hand, joint rocking offers low energy dissipation and high self-centering capabilities that deteriorate at larger rocking rotations due to the resulting concrete crushing.^The response of HSR joints is affected by the geometry of the post-tensioning (PT) system along the member length. Hence, linear or nonlinear PT geometry may be used to control joint and member response properties. Two distinct types of HSR members were further studied: (i) HSR members with slip-dominant joints and linear PT geometry (abbreviated as HSR-SD members), and (ii) HSR members with rocking- dominant joints and nonlinear PT geometry (abbreviated as HSR-RD members). The concept of HSR bridges was evaluated through a two-stage experimental study. The first stage included shake table testing of a large-scale (~ 1:2. 39) single-span bridge specimen incorporating a HSR-RD superstructure and two HSR-SD single-column piers. Nearly 150 seismic tests were conducted including far-field and near-fault input motions scaled to different seismic hazard levels.^The second stage included quasi-static testing of the HSR-SD piers with a sequence of displacement-controlled loading cycles of increasing amplitude that eventually reached a drift ratio of approximately 15%. The experimental findings from the large-scale seismic and quasi-static testing programs were complemented by two additional experimental studies; one focusing on the identification of the frictional properties of the HSR joint interface, and another investigating the response of the strand-anchor systems (i.e., unbonded monostrands with their anchorage setups at their ends). Numerical predictions for the quasi-static testing were provided by a model of the HSR-SD pier generated with the ABAQUS general-purpose finite element software, while numerical predictions for the seismic testing were provided by a model of the HSR bridge specimen generated in SAP2000. Comparisons between numerical and experimental results are presented.^This dissertation is concluded with an investigation of the response properties of flexibility-based (or force-based) beam-column elements in the presence of softening section constitutive relations. This study identified and explained critical numerical instability problems observed during the development of force-based elements for HSR members.

Download or read book Seismic Behavior and Retrofit of Older Reinforced Concrete Bridge T joints written by Laura N. Lowes and published by . This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experimental tests investigating the seismic response of reinforced concrete beam-column T-joints was recently completed at the University of California, Berkeley. The evaluated connection was representative of an interior beam- column joint from a multi-column bridge frame built in the late 1950's. Three one-third scale models, representing the as-built connection and two retrofit connections, were tested. The results of this research project are an improved understanding of the seismic behavior of lightly reinforced bridge T-joints as well as verification of a design procedure for retrofitting this type of connection.

Download or read book Seismic Evaluation and Retrofit of Concrete Bridge Columns and Joints written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Earthquakes written by Taher Zouaghi and published by . This book was released on 19?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Based Seismic Engineering Vision for an Earthquake Resilient Society written by Matej Fischinger and published by Springer. This book was released on 2014-07-15 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bled workshops have traditionally produced reference documents providing visions for the future development of earthquake engineering as foreseen by leading researchers in the field. The participants of the 2011 workshop built on the tradition of these events initiated by Professors Fajfar and Krawinkler to honor their important research contributions and have now produced a book providing answers to crucial questions in today’s earthquake engineering: “What visible changes in the design practice have been brought about by performance-based seismic engineering? What are the critical needs for future advances? What actions should be taken to respond to those needs?” The key answer is that research interests should go beyond the narrow technical aspects and that the seismic resilience of society as a whole should become an essential part of the planning and design process. The book aims to provide essential guidelines for researchers, professionals and students in the field of earthquake engineering. It will also be of particular interest for all those working at insurance companies, governmental, civil protection and emergency management agencies that are responsible for assessing and planning community resilience. The introductory chapter of the book is based on the keynote presentation given at the workshop by the late Professor Helmut Krawinkler. As such, the book includes Helmut’s last and priceless address to the engineering community, together with his vision and advice for the future development of performance-based design, earthquake engineering and seismic risk management.

Download or read book Seismic Response of Unbonded Post tensioned Precast Concrete Walls with Ductile Vertical Connections written by James Roland Conley and published by . This book was released on 2000 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Precast Segmental Bridge Superstructures written by Marc John Veletzos and published by . This book was released on 2006 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Evaluation of Bridge Columns with Energy Dissipating Mechanisms written by Mehdi Saiidi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Research Report 864: Seismic Evaluation of Bridge Columns with Energy Dissipating Mechanisms, Volume 1: Research Overview and Volume 2: Guidelines describes the evaluation of new materials and techniques for design and construction of novel bridge columns meant to improve seismic performance. These techniques include shape memory alloy (SMA), engineered cementitious composite (ECC), fiber-reinforced polymer (FRP), and rocking mechanisms. The guidelines contained in Volume 2 explore a quantitative evaluation method to rate novel columns as well as design and construction methods for SMA-reinforced ECC columns, SMA-reinforced FRP-confined concrete/columns, and FRP-confined hybrid rocking columns. The project explores the behavior of the selected columns and develops proposed design guidelines according to the AASHTO LRFD Bridge Design Specifications and the AASHTO Guide Specifications for LRFD Seismic Bridge Design. Appendices A-I are available online.

Download or read book Seismic Evaluation of Bridge Columns with Energy Dissipating Mechanisms written by Mehdi Saiidi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Research Report 864: Seismic Evaluation of Bridge Columns with Energy Dissipating Mechanisms, Volume 1: Research Overview and Volume 2: Guidelines describes the evaluation of new materials and techniques for design and construction of novel bridge columns meant to improve seismic performance. These techniques include shape memory alloy (SMA), engineered cementitious composite (ECC), fiber-reinforced polymer (FRP), and rocking mechanisms. The guidelines contained in Volume 2 explore a quantitative evaluation method to rate novel columns as well as design and construction methods for SMA-reinforced ECC columns, SMA-reinforced FRP-confined concrete/columns, and FRP-confined hybrid rocking columns. The project explores the behavior of the selected columns and develops proposed design guidelines according to the AASHTO LRFD Bridge Design Specifications and the AASHTO Guide Specifications for LRFD Seismic Bridge Design. Appendices A-I are available online.

Download or read book Next Generation of Bridge Columns for Accelerated Bridge Construction in High Seismic Zones written by Mostafa Tazarv and published by . This book was released on 2014 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Longitudinal bar debonding allowed spread of yielding and prevented premature failure of reinforcements in UHPC-filled duct connections and grouted coupler column pedestal. The SMA-reinforced ECC column showed superior seismic performance compared to a conventional column in which the plastic hinge damage was limited to only ECC cover spalling even under 12% drift ratio cycles. The column residual displacements were 79% lower than CIP residual displacements on average due to the superelastic NiTi SMA longitudinal reinforcement, and higher base shear capacity and higher displacement capacity were observed. The analytical modeling methods were simple and sufficiently accurate for general design and analyses of precast components proposed in the present study. The proposed symmetrical material model for reinforcing NiTi superelastic SMA was found to be a viable alternative to the more complex asymmetrical model.