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Tri Directional Seismic Analysis Of An Unreinforced Masonry Building With Flexible Diaphragms
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Book Synopsis Tri-directional Seismic Analysis of an Unreinforced Masonry Building with Flexible Diaphragms by : Steven C. Sweeney
Download or read book Tri-directional Seismic Analysis of an Unreinforced Masonry Building with Flexible Diaphragms written by Steven C. Sweeney and published by . This book was released on 2004 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tri Directional Seismic Response of Unreinforced Masonry Building Systems by : Sarah Lynn Orton
Download or read book Tri Directional Seismic Response of Unreinforced Masonry Building Systems written by Sarah Lynn Orton and published by . This book was released on 2002 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of a Half-scale Masonry Building with Flexible Diaphragms by : Steven C. Sweeney
Download or read book Seismic Response of a Half-scale Masonry Building with Flexible Diaphragms written by Steven C. Sweeney and published by . This book was released on 2005 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Department of Defense. Tri-Service Seismic Design Committee Publisher : ISBN 13 : Total Pages :464 pages Book Rating :4.X/5 (2 download)
Book Synopsis Seismic Design for Buildings by : United States. Department of Defense. Tri-Service Seismic Design Committee
Download or read book Seismic Design for Buildings written by United States. Department of Defense. Tri-Service Seismic Design Committee and published by . This book was released on 1973 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Strengthening of Low-rise Unreinforced Masonry Structures with Flexible Diaphragms by : Franklin Lehr Moon
Download or read book Seismic Strengthening of Low-rise Unreinforced Masonry Structures with Flexible Diaphragms written by Franklin Lehr Moon and published by . This book was released on 2003 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a capstone to several Mid-America Earthquake Center (MAE Center) projects, a full-scale two story unreinforced masonry (URM) building was tested following the application of several retrofit techniques, which included the use of fiber reinforced polymer (FRP) overlays, near surface mounted (NSM) rods, vertical unbonded post-tensioning, and joist anchors. The test structure was composed of four URM walls, flexible timber diaphragms and interior stud walls, and was designed and built following construction practices consistent with those used in Mid-America prior to 1950. Initial testing subjected both the roof diaphragm and in-plane walls to slowly applied lateral load reversals in an unreinforced sate. Following this series of tests, each in-plane wall was retrofit and retested. Experimental results indicated that global issues such as flange participation and the effects of overturning moment substantially impacted the response of primary components both before and after retrofit. FRP retrofit techniques resulted in strength increases up to 32% and displayed a pseudo-ductile response caused by progressive debonding. For cases where such retrofits forced sliding failures, large increases in energy dissipation resulted. The use of vertical unbonded post-tensioning resulted in strength increases between 40%-60%; however, piers displayed a tendency to switch from a ductile rocking/sliding mode to a more brittle diagonal tension mode. In addition, results highlighted the need for retrofit schemes to employ both horizontal and vertical reinforcement to prevent progressive crack opening that can decrease wall displacement capacity. Based on the experimental results, the model implied by the "Prestandard for the Rehabilitation of Existing Structures," FEMA 356, for the analysis of in-plane URM walls was modified and extended to (1) include the effect of FRP pier retrofits and (2) consider the global effects of URM structures. The resulting model displayed reasonable estimates of measured response both before and after retrofit, with an average error of 14%. In addition, the proposed model displayed improvements over the current model from 14% to 66%. Based on the results of sensitivity analyses this improved accuracy was primarily attributed to the consideration of global effects.
Book Synopsis Seismic Response of Low-Rise Masonry Buildings With Flexible Roof Diaphragms by : Gregory L. Cohen
Download or read book Seismic Response of Low-Rise Masonry Buildings With Flexible Roof Diaphragms written by Gregory L. Cohen and published by . This book was released on 2001 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study compares the responses from shaking-table testing and analytical predictions evaluated in the context of geometric scaling, to provide a coherent description of the seismic response of low-rise masonry buildings with flexible roof diaphragms. Two half-scale, low-rise reinforced masonry buildings with flexible roof diaphragms are subjected to carefully selected earthquake ground motion on the Tri-axial Earthquake and Shock Simulator at the Construction Engineering Research Laboratory. Damage to the half-scale specimens is assessed using published protocols. Geometric scaling analysis relates response and damage of the half-scale specimens to those of the full-scale prototype structures. Linear elastic modeling is simplified to a generalized two-degrees-of-freedom idealization. Response-spectrum analysis of such an idealization is accurate and justified for prediction of dynamic response of the half-scale specimens and the corresponding full-scale prototype. It is shown that low-rise masonry buildings with flexible roof diaphragms can be designed for seismic loads as single-degree-of- freedom systems, using the degree of freedom associated with the in-plane response of the diaphragm in the building's transverse direction, rather than the degree of freedom associated with the in-plane responses of the shear walls.
Book Synopsis Seismic Evaluation of Low-Rise Reinforced Masonry Buildings with Flexible Diaphragms by : Steven C. Sweeney
Download or read book Seismic Evaluation of Low-Rise Reinforced Masonry Buildings with Flexible Diaphragms written by Steven C. Sweeney and published by . This book was released on 2008 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides an integrated approach to the seismic evaluation of low-rise reinforced masonry buildings with flexible roof diaphragms. The paper is divided into four phases. In Phase 1 (Behavior), results from shaking-table testing, quasi-static testing, and analytical predictions are integrated to provide a coherent description of the seismic response of low-rise reinforced masonry buildings with flexible roof diaphragms. Two half-scale, low-rise reinforced masonry buildings with flexible roof diaphragms are subjected to earthquake ground motions on the Tri-axial Earthquake and Shock Simulator at the United States Army Construction Engineering Research Laboratory, Engineer Research and Development Center. Following the shaking-table tests, diaphragms and top four courses of attached masonry walls are salvaged from the half-scale structures and tested quasi-statically in their own plane. A new index, the diaphragm drift ratio, is introduced to describe the potential for diaphragm damage. In Phase 2 (Analysis), coordinated analytical modeling is developed and implemented to corroborate and extend the results of that experimental work, and to examine the efficacy and accuracy of different analytical modeling approaches. Linear elastic finite-element models, simplified two-degree-of-freedom models, and nonlinear lumped-parameter models are developed; all agree well with measured responses. In Phase 3 (Seismic Evaluation), the first two phases are used to develop and verify a simple extension to FEMA 310, the predominant seismic evaluation methodology for low-rise reinforced masonry buildings with flexible diaphragms. In Phase 4 (Application and Verification), the proposed extension, applied to four existing buildings, is shown to be simple, useful, and necessary.
Author :Jocelyn Paquette Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612728202 Total Pages :362 pages Book Rating :4.7/5 (282 download)
Book Synopsis Seismic Testing of Unreinforced Masonry Building with Flexible Diaphragm [microform] by : Jocelyn Paquette
Download or read book Seismic Testing of Unreinforced Masonry Building with Flexible Diaphragm [microform] written by Jocelyn Paquette and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2002 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Response of Unreinforced Masonry Buildings with Flexible Diaphragms by : A. C. Costley
Download or read book Dynamic Response of Unreinforced Masonry Buildings with Flexible Diaphragms written by A. C. Costley and published by . This book was released on 1996 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Evaluation of Low-rise Reinforced Masonry Buildings with Flexible Diaphragms by :
Download or read book Seismic Evaluation of Low-rise Reinforced Masonry Buildings with Flexible Diaphragms written by and published by . This book was released on 2004 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NTIS Alert written by and published by . This book was released on 2005 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guidelines for Seismic Evaluation and Rehabilitation of Tilt-up Buildings and Other Rigid Wall/flexible Diaphragm Structures by :
Download or read book Guidelines for Seismic Evaluation and Rehabilitation of Tilt-up Buildings and Other Rigid Wall/flexible Diaphragm Structures written by and published by . This book was released on 2001 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings by : Federal Emergency Agency
Download or read book Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings written by Federal Emergency Agency and published by FEMA. This book was released on 2013-04-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the two damaging California earthquakes in 1989 (Loma Prieta) and 1994 (Northridge), many concrete wall and masonry wall buildings were repaired using federal disaster assistance funding. The repairs were based on inconsistent criteria, giving rise to controversy regarding criteria for the repair of cracked concrete and masonry wall buildings. To help resolve this controversy, the Federal Emergency Management Agency (FEMA) initiated a project on evaluation and repair of earthquake damaged concrete and masonry wall buildings in 1996. The ATC-43 project addresses the investigation and evaluation of earthquake damage and discusses policy issues related to the repair and upgrade of earthquake damaged buildings. The project deals with buildings whose primary lateral-force-resisting systems consist of concrete or masonry bearing walls with flexible or rigid diaphragms, or whose vertical-load-bearing systems consist of concrete or steel frames with concrete or masonry infill panels. The intended audience is design engineers, building owners, building regulatory officials, and government agencies. The project results are reported in three documents. The FEMA 306 report, Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings, Basic Procedures Manual, provides guidance on evaluating damage and analyzing future performance. Included in the document are component damage classification guides, and test and inspection guides. FEMA 307, Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings, Technical Resources, contains supplemental information including results from a theoretical analysis of the effects of prior damage on single-degree-of-freedom mathematical models, additional background information on the component guides, and an example of the application of the basic procedures. FEMA 308, The Repair of Earthquake Damaged Concrete and Masonry Wall Buildings, discusses the policy issues pertaining to the repair of earthquake damaged buildings and illustrates how the procedures developed for the project can be used to provide a technically sound basis for policy decisions. It also provides guidance for the repair of damaged components.
Book Synopsis Seismic Evaluation of Low-rise Reinforced Masonry Buildings with Flexible Diaphragms by : Gregory L. Cohen
Download or read book Seismic Evaluation of Low-rise Reinforced Masonry Buildings with Flexible Diaphragms written by Gregory L. Cohen and published by . This book was released on 2006 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Assessment of Timber Floor Diaphragms in Unreinforced Masonry Buildings by : Aaron W. Wilson
Download or read book Seismic Assessment of Timber Floor Diaphragms in Unreinforced Masonry Buildings written by Aaron W. Wilson and published by . This book was released on 2012 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: An integrated experimental and analytical study investigating the in-plane performance of timber floor diaphragms in URM buildings is presented. The research presented in this thesis was conducted with the primary aim of developing a revised procedure for the detailed seismic assessment of timber floor diaphragms in URM buildings. The deformation mechanics of timber floor diaphragms are presented and were used to develop an analytical model that can be used to predict diaphragm nonlinear performance. The analytical model was used to update the current idealisation of diaphragm behaviour in current seismic assessment documents. A three-phase experimental testing program is presented. Nail connection testing results indicated that connections in diaphragms contained within existing URM buildings have substantially lower initial stiffness, strength, and displacement capacity than do new connections. Small-scale diaphragm testing results proved that friction resistance between straight-edge or tongue and groove floorboards is negligible. Full-scale diaphragm testing results confirmed the highly flexible and orthotropic behaviour of timber floor diaphragms, and that a small stairwell penetration or the presence of discontinuous joists having a reliable mechanical connection do not significantly influence diaphragm performance. A finite element (FE) modelling method for timber floor diaphragms using the structural analysis software SAP2000 was appropriately validated using analytical modelling results and experimental data. Salvaged nail connection load-slip test data was used to program a diaphragm FE model to establish the representative performance of diaphragms in ~100 year old URM buildings in New Zealand. A comprehensive parametric analysis of diaphragm behaviour was subsequently undertaken. Finally, a revised assessment procedure for timber floor diaphragms was developed, which incorporates representative performance parameters, and provides suitable provisions to account for diaphragm orthotropic behaviour and for variations in key diaphragm configuration characteristics.
Book Synopsis Experimental Investigation and Numerical Simulation of an Unreinforced Masonry Structure with Flexible Diaphragms by : Tianyi Yi
Download or read book Experimental Investigation and Numerical Simulation of an Unreinforced Masonry Structure with Flexible Diaphragms written by Tianyi Yi and published by . This book was released on 2004 with total page 1268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unreinforced masonry (URM) construction, which has been widely used in the United States, presents a large threat to life safety and regional economic development because of its poor seismic resistance. In this research, the nonlinear seismic properties of URM structures were investigated via a quasi-static test of a full-scale two-story URM building and associated analytical and numerical studies. The tests of the 24ft. by 24ft. in plan 22ft. high URM building revealed that the damage was characterized by (1) the formation of large discrete cracks in the masonry walls and (2) the rocking and sliding of URM piers. Both of these results were consistent with the predictions based on individual component properties obtained in previous research. However, the tests also revealed significant global behavior phenomena, including flange effects, overturning moment effects, and the formation of different effective piers in a perforated wall. This global behavior greatly affected the response of the URM building tested. In order to understand the nonlinear behavior of the test structure, a series of analytical studies were conducted. First, at the material level, a mechanical key model was proposed to describe the failure of URM assemblages under a biaxial state of stress. Second, at the component level, an effective pier model was developed to illustrate the mixed failure modes of a URM pier and its nonlinear force-deformation relationship. Third, at the structure level, a nonlinear pushover model was built using the mechanical models at the material and component levels to describe the nonlinear properties of a URM building. This nonlinear pushover model and a three-dimensional finite element model were employed to analyze the test structure. Both gave results in good agreement with the test data. Improvements to current provisions for the evaluation of existing masonry structures were proposed.
Book Synopsis Seismic Strengthening of Unreinforced Masonry Buildings by : Kit M. Wong
Download or read book Seismic Strengthening of Unreinforced Masonry Buildings written by Kit M. Wong and published by . This book was released on 1987 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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