地震中砌体填充墙和RC框架梁柱协同作用机理
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摘要
系统地介绍了汶川地震灾区填充墙框架结构的震害特征,分析了震害原因。研究表明,填充墙能显著增大结构的侧向刚度和侧向承载力,填充墙的强度越高或框架越弱,填充墙对结构刚度和承载力的提高程度越大;填充墙在平面内的布置不均造成局部刚度集中,导致地震中出现应力集中或结构整体发生扭转;填充墙在竖向布置不连续形成软弱层时,结构的变形和破坏在软弱层集中发生。当实心砖填充墙与框架梁柱连接较强且框架较弱、填充墙相对较强时,两者形成组合体共同承受地震作用;地震中填充墙对框架梁柱的约束作用、挤压作用以及填充墙局部失效会改变框架梁柱的约束条件和受力状态,形成短柱、极短柱、短梁,甚至会发生某些非常规的破坏。
The seismic damage characteristics of infilled wall frame structure in Wenchuan Earthquake zone were systematically introduced and the reasons were analyzed. Research shows that the infilled wall can significantly increase lateral stiffness and lateral bearing capacity of the structure. The higher the strength of the infilled wall or weaker the frame,the higher is the development degree of structural stiffness and bearing capacity by infilled wall. The uneven arrangement of the infilled wall in plane causes the local stiffness concentration,which leads to the stress concentration or the whole structural torsion in earthquake. The discontinuous arrangement of the infilled wall in vertical plane causes weak layer,and structural deformation and failure occurre in the weak layer. When the solid brick infilled wall and frame have strong connections and infilled wall frame is relatively stronger than frame,the two members form a combination to withstand earthquake. The constraint condition and the stress state of the beam and column of the frame can be changed by constraint,extrusion and local failure of infilled wall to form the short column,super-short column,short beam or even some non-conventional damage.
The seismic damage characteristics of infilled wall frame structure in Wenchuan Earthquake zone were systematically introduced and the reasons were analyzed. Research shows that the infilled wall can significantly increase lateral stiffness and lateral bearing capacity of the structure. The higher the strength of the infilled wall or weaker the frame,the higher is the development degree of structural stiffness and bearing capacity by infilled wall. The uneven arrangement of the infilled wall in plane causes the local stiffness concentration,which leads to the stress concentration or the whole structural torsion in earthquake. The discontinuous arrangement of the infilled wall in vertical plane causes weak layer,and structural deformation and failure occurre in the weak layer. When the solid brick infilled wall and frame have strong connections and infilled wall frame is relatively stronger than frame,the two members form a combination to withstand earthquake. The constraint condition and the stress state of the beam and column of the frame can be changed by constraint,extrusion and local failure of infilled wall to form the short column,super-short column,short beam or even some non-conventional damage.
引文
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[8]SCHULLER M,MEHRABI A B,NOLAND J L,et al.Performance of masonry-infilled R/C frames under inplane lateral loads:experiments[C]//Proceedings,NCEER Workshop on Seismic Response of Masonry Infills(SectionⅠ).San Francisco,1994:27-32.
[9]MEHRABI A B,SHING P B.Performance of masonryinfilled R/C frames under in-plane lateral loads:analytical modeling[C]//Proceedings,NCEER Workshop on Seismic Response of Masonry Infills(SectionⅠ).San Francisco,1994:45-50.
[2]LI BIXIONG,WANG ZHE,MOSALAM K M.Wenchuan Earthquake filed reconnaissance on reinforced concrete framed buildings with and without masonry infill walls[C]//Proceedings of 14th World Conference on Earthquake Engineering.Beijing,2010:S31-035.
[3]李碧雄,谢和平,邓建辉,等.汶川地震中房屋建筑震害特征及抗震设计思考[J].防灾减灾工程学报,2009,29(2):224-230.
[4]GNAY S,MOSALAM K M.Structural engineering reconnaissance of the April 6,2009,Abruzzo,Italy,earthquake,and lessons learned[R].Pacific Earthquake Engineering Research Center,PEER 2010/105,UC Berkeley,2010.
[5]HASHEMI S A,MOSALAM K M.Seismic evaluation of reinforced concrete buildings including effects of infill masonry walls[R].Pacific Earthquake Engineering Research Center,PEER 2007/100,UC Berkeley,2007.
[6]MOSALAM K M,WHITE R N,AYALA G.Response of infilled frames using pseudo-dynamic experimentation[J].Earthquake Engineering and Structural Dynamics,1998,27(6):589-608.
[7]李碧雄,雷涛,邓建辉.汶川地震中学校建筑震害研究[J].四川大学学报:工程科学版,2009,41(3):172-179.
[8]SCHULLER M,MEHRABI A B,NOLAND J L,et al.Performance of masonry-infilled R/C frames under inplane lateral loads:experiments[C]//Proceedings,NCEER Workshop on Seismic Response of Masonry Infills(SectionⅠ).San Francisco,1994:27-32.
[9]MEHRABI A B,SHING P B.Performance of masonryinfilled R/C frames under in-plane lateral loads:analytical modeling[C]//Proceedings,NCEER Workshop on Seismic Response of Masonry Infills(SectionⅠ).San Francisco,1994:45-50.
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