Seismic Response Of A Half Scale Masonry Building With Flexible Diaphragms
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Seismic Response Of A Half Scale Masonry Building With Flexible Diaphragms
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Author : Steven C. Sweeney
language : en
Publisher:
Release Date : 2005
Seismic Response Of A Half Scale Masonry Building With Flexible Diaphragms written by Steven C. Sweeney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Buildings categories.
Seismic Response Of Low Rise Masonry Buildings With Flexible Roof Diaphragms
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Author : Gregory L. Cohen
language : en
Publisher:
Release Date : 2001
Seismic Response Of Low Rise Masonry Buildings With Flexible Roof Diaphragms written by Gregory L. Cohen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
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.
Tri Directional Seismic Analysis Of An Unreinforced Masonry Building With Flexible Diaphragms
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Author : Steven C. Sweeney
language : en
Publisher:
Release Date : 2004
Tri Directional Seismic Analysis Of An Unreinforced Masonry Building With Flexible Diaphragms written by Steven C. Sweeney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Buildings categories.
Seismic Evaluation Of Low Rise Reinforced Masonry Buildings With Flexible Diaphragms
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Author : Steven C. Sweeney
language : en
Publisher:
Release Date : 2008
Seismic Evaluation Of Low Rise Reinforced Masonry Buildings With Flexible Diaphragms written by Steven C. Sweeney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Flexible diaphragm categories.
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.
Seismic Analysis Of Multi Story Unreinforced Masonry Buildings With Flexible Diaphragms
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Author : Juan Aleman Hernandez
language : en
Publisher:
Release Date : 2014
Seismic Analysis Of Multi Story Unreinforced Masonry Buildings With Flexible Diaphragms written by Juan Aleman Hernandez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Studies regarding the regional seismicity of New York City (NYC) indicate that earthquakes of magnitude greater than or equal to 5 have a 20-40% probability of occurring in a 50 year period. Considering that more than 50% of the large population of the region (19.1 million) is living in an area where 80% of the buildings are of old Unreinforced Masonry (URM) construction, it is likely that even a moderate earthquake could have critical consequences on public safety and the economy of this area. The main goal of this study was to develop simulation capabilities supported by experimental testing to evaluate the seismic performance of typical unreinforced masonry buildings with flexible diaphragms located in NYC. Simplified nonlinear macro-models of wood diaphragms, masonry walls and floor-to-wall connections were developed and validated individually using data from past experiments. The models are implemented in both commercial and research software to demonstrate their practical use. In particular, a new approach for modeling flexible diaphragms is proposed that is shown to provide similar accuracy to detailed finite element models at a fraction of the computation cost. The models developed were also validated as at the system level, through shake table testing of two full-scale specimens conducted as part of this study. The specimens were designed and constructed to represent the expected loading conditions of a central portion of a one-story URM building and constructed of materials representative of older masonry construction. The tests provide a unique data set that captures the interaction between flexible floors, out-of-plane walls and their connections at, full scale.The validated macro-models can be used for performance-based seismic assessment of unreinforced masonry building in NYC and elsewhere. To demonstrate their use, preliminary studies were conducted to develop out-of-plane URM fragility curves, a building-specific collapse fragility function, and estimate the seismic response of the building when subjected to a ground shaking intensity similar to the 2011 Virginia Earthquake. The probabilistic framework and new performance definitions provided by the FEMA P58 project were used to conduct a performance-based seismic assessment for an archetype unreinforced masonry building in New York City with an emphasis on out-of-plane behavior. This preliminary study served to demonstrate the applicability of the proposed models for applications in performance-based design.
Dynamic Response Of Unreinforced Masonry Buildings With Flexible Diaphragms
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Author : A. C. Costley
language : en
Publisher:
Release Date : 1996
Dynamic Response Of Unreinforced Masonry Buildings With Flexible Diaphragms written by A. C. Costley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Building, Brick categories.
Seismic Strengthening Of Low Rise Unreinforced Masonry Structures With Flexible Diaphragms
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Author : Franklin Lehr Moon
language : en
Publisher:
Release Date : 2003
Seismic Strengthening Of Low Rise Unreinforced Masonry Structures With Flexible Diaphragms written by Franklin Lehr Moon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Composite materials categories.
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.
Seismic Behaviour And Design Of Irregular And Complex Civil Structures Iv
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Author : Rita Bento
language : en
Publisher: Springer Nature
Release Date : 2022-01-18
Seismic Behaviour And Design Of Irregular And Complex Civil Structures Iv written by Rita Bento and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-18 with Science categories.
This volume contains papers of the 9th European Workshop on the Seismic Behaviour of Irregular and Complex Structures (9EWICS) held in Lisbon, Portugal, in 2020. This workshop, organized at Instituto Superior Técnico, University of Lisbon, continued the successful three-annual series of workshops started back in 1996. Its organization had the sponsorship of Working Group 8 (Seismic Behaviour of Irregular and Complex Structures) of the European Association of Earthquake Engineering.This international event provided a platform for discussion and exchange of ideas and unveiled new insights on the possibilities and challenges of irregular and complex structures under seismic actions. The topics addressed include criteria for regularity, seismic design of irregular structures, seismic assessment of irregular and complex structures, retrofit of irregular and complex structures, and soil-structure interaction for irregular and complex structures. Beyond an excellent number of interesting papers on these topics, this volume includes the papers of the two invited lectures – one devoted to irregularities in RC buildings, including perspectives in current seismic design codes, difficulties in their application and further research needs, and another one dedicated to the challenging and very up to date topic in the area of seismic response of masonry building aggregates in historical centers. This volume includes 26 contributions from authors of 11 countries, giving a complete and international view of the problem.The holds particular interest for all the community involved in the challenging task of seismic design, assessment and/or retrofit of irregular and complex structures.
Earthquake Spectra
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Author :
language : en
Publisher:
Release Date : 2006
Earthquake Spectra written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Earthquake engineering categories.
Masonry
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Author : Brian Trimble
language : en
Publisher: ASTM International
Release Date : 2008
Masonry written by Brian Trimble and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Technology & Engineering categories.
Papers from a June 2006 symposium report on recent work in cement, lime, mortars for unit masonry, and manutactured masonry units. Some specific topics covered include investigation and repair of glazed brick cladding, the benefits and problems of ASTM C 1324 for analyzing hardened masonry mortars, time-of-cooling effects on mortar joint color, and the selection and use of natural and manufactured stone adhered veneer. Other subjects examined include defection criteria for masonry beams, the effect of void area on brick masonry performance, seismic evaluation of low-rise reinforced masonry buildings with flexible diaphragms, and greening of mortars. B&w photos and illustrations are included. Trimble is affiliated with the Brick Industry Association. Brisch is affiliated with Rockwell Lime Company. There is no subject index.