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Study on the effect of the infill walls on the seismic performance of a reinforced concrete frame

Earthquake Engineering and Engineering Vibration 2011年第4期10卷 507-517页

作者： Zhang Cuiqiang Zhou Ying Zhou Deyuan Lu Xilin Research Institute of Structural Engineering and Disaster Reduction Tongji University Shanghai 200092 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

Motivated by the seismic damage observed to reinforced concrete （RC） frame structures during the Wenchuan earthquake, the effect of infill walls on the seismic performance of a RC frame is studied in this paper. infill walls, especially those made of masonry, offer some amount of stiffness and strength. Therefore, the effect of infill walls should be considered during the design of RC frames. In this study, an analysis of the recorded ground motion in the Wenehuan earthquake is performed. Then, a numerical model is developed to simulate the infill walls. Finally, nonlinear dynamic analysis is carried out on a RC frame with and without infill walls, respectively, by using CANNY software. Through a comparative analysis, the following conclusions can be drawn. The failure mode of the frame with infill walls is in accordance with the seismic damage failure pattern, which is strong beam and weak column mode. This indicates that the infill walls change the failure pattern of the frame, and it is necessary to consider them in the seismic design of the RC frame. The numerical model presented in this paper can effectively simulate the effect of infill walls on the RC frame.

关键词： infill walls RC frame structure strong column and weak beam strong beam and weak column nonlinear time history analysis

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An effective simplified model of composite compression struts for partially-restrained steel frame with reinforced concrete infill walls

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 403-415页

作者： Sun Guohua Chuang-Sheng Walter Yang Gu Qiang Reginald DesRoches School of Civil Engineering Suzhou University of Science & Technology School of Civil and Environmental Engineering Georgia Institute of Technology

To resolve the issue regarding inaccurate prediction of the hysteretic behavior by micro-based numerical analysis for partially-restrained（PR）steel frames with solid reinforced concrete（RC）infill walls,an innovative simplified model of composite compression struts is proposed on the basis of experimental observation on the cracking distribution,load transferring mechanism,and failure modes of RC infill walls filled in PR steel *** proposed composite compression struts model for the solid RC infill walls is composed ofαinclined struts and main diagonal ***αinclined struts are used to reflect the part of the lateral force resisted by shear connectors along the frame-wall interface,while the main diagonal struts are introduced to take into account the rest of the lateral force transferred along the diagonal direction due to the complicated interaction between the steel frame and RC infill *** study derives appropriate formulas for the effective widths of theαinclined strut and main diagonal strut,*** example of PR steel frame with RC infill walls simulating simulated by the composite inclined compression struts model is *** maximum lateral strength and the hysteresis curve shape obtained from the proposed composite strut model are in good agreement with those from the test results,and the backbone curve of a PR steel frame with RC infill walls can be predicted precisely when the inter-story drift is within 1%.This simplified model can also predict the structural stiffness and the equivalent viscous damping ratio well when the inter-story drift ratio exceeds 0.5%.

关键词： PR connection steel frame infill walls shear connector hysteretic behavior strut

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Performance of masonry enclosure walls:lessons learned from recent earthquakes

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Earthquake Engineering and Engineering Vibration 2012年第1期11卷 23-34页

作者： Romeu Silva Vicente Hugo Rodrigues Humberto Varum Aníbal Costa Jos António Raimundo Mendes da Silva University of Aveiro Civil Engineering Department Campus Universitario de SantiagoAveiroPT3810-193Portugal University of Coimbra Civil Engineering Pinhal de MarrocosPolo ⅡCoimbraPT3030Portugal

This paper discusses the issue of performance requirements and construction criteria for masonry enclosure and infill walls. Vertical building enclosures in European countries are very often constituted by non-load-bearing masonry walls, using horizontally perforated clay bricks. These walls are generally supported and confined by a reinforced concrete frame structure of columns and beams/slabs. Since these walls are commonly considered to be nonstructural elements and their influence on the structural response is ignored, their consideration in the design of structures as well as their connection to the adjacent structural elements is frequently negligent or insufficiently detailed. As a consequence, nonstructural elements, as for wall enclosures, are relatively sensitive to drift and acceleration demands when buildings are subjected to seismic actions. Many international standards and technical documents stress the need for design acceptability criteria for nonstructural elements, however they do not specifically indicate how to prevent collapse and severe cracking, and how to enhance the overall stability in the case of moderate to high seismic loading. Furthermore, a review of appropriate measures to improve enclosure wall performance and both in-plane and out-of-plane integrity under seismic actions is addressed.

关键词： RC structures masonry enclosure walls infill walls in-plane out-of-plane cracking performanceimprovement

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An Innovative Seismic Protection System for Conventional RC Buildings

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Journal of Civil Engineering and Architecture 2017年第12期11卷 1077-1085页

作者： Zekirija Idrizi Isak Idrizi Faculty of Civil Engineering and Architecture Hasan Prishtina University Prishine 10000 Kosova Faculty of Civil Engineering and Architecture Mother Teresa University Shkup 1000 Macedonia

As capacity design philosophy suggests, the best way to achieve a safe seismic response of multistory buildings, under strong earthquakes, is to uniformly spread the inelastic deformation demands throughout the building structure. Unfortunately, this type of mechanism is difficult to be reached due to the abundant presence ofinfill wall panels on buildings, which under strong earthquakes show severe cracks and strength degradations, thus complicating the seismic response of buildings. In order to avoid these brittle mechanisms of failure, studies were made toward development of new seismic protection system which would completely protect the infill walls from any cracks and strength degradation manifestations and simultaneously improve the seismic response of the entire structure. Utilization of the ＂IDRIZI＂ seismic protection system, would greatly contribute to many important aspects, like the increase of structural seismic performance, drastic reduction of damages under strong earthquake events and avoiding any unpredictable local failure mechanisms on buildings.

关键词： infill walls IDRIZI seismic protection system passive control friction device

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