多层框架结构利用铅芯叠层橡胶支座加层减震分析
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摘要
结合一幢多层框架结构应用铅芯叠层橡胶支座进行加层改造的工程实例,在对隔震层的抗侧刚度和阻尼比基于能量准则进行优化的基础上,利用Matlab语言编制了弹塑性时程分析程序,输入两条实际地震动记录和一条人工波.计算结果表明:各层位移和加速度响应以及最大层间剪力和最大层间位移均较加层前有所减少,特别是位移响应减少更为明显;同时也验证了该能量优化准则的合理性与有效性.这种加层减震技术既增加了使用面积,又提高了抗震能力,在中低层建筑的改造中具有良好的应用前景,值得推广.
More stories are added to a multi-storey RC frame using lead laminated rubber bearings.A program is developed with MATLAB language to conduct elastic-plastic time history analysis,according to the optimization results of lateral rigidness and damping ratio of isolation layer based on energy criterion,and two real ground motion records and a synthetic record are input.The results show that displacement and acceleration response,interstorey shear force and story drift of each storey decrease compared to those results prior to adding-storey,and displacement response decrease significantly.This numerical example also demonstrates the effectiveness and rationality of proposed energy-based optimization criterion.This adding-storey technique increases usable area and improve the seismic capacity of existing building,which has good application prospect in the upgrading of medium and low-rise buildings.
More stories are added to a multi-storey RC frame using lead laminated rubber bearings.A program is developed with MATLAB language to conduct elastic-plastic time history analysis,according to the optimization results of lateral rigidness and damping ratio of isolation layer based on energy criterion,and two real ground motion records and a synthetic record are input.The results show that displacement and acceleration response,interstorey shear force and story drift of each storey decrease compared to those results prior to adding-storey,and displacement response decrease significantly.This numerical example also demonstrates the effectiveness and rationality of proposed energy-based optimization criterion.This adding-storey technique increases usable area and improve the seismic capacity of existing building,which has good application prospect in the upgrading of medium and low-rise buildings.
引文
[1]谢军龙,周福霖.多层房屋结构TMD“加层减震”试验研究和应用[J].世界地震工程,1998,14(4):57-60.
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[2]牛金龙,施卫星.房屋建筑顶层采用橡胶支承的消能减震[J].建筑结构,2002,32(6):63-65.
[3]施卫星,王群.地震区既有建筑物增层中的结构控制方法[J].结构工程师,1996,13(4):37-42.
[4]李奉阁,赵根田,田志昌.利用结构增层聚集和耗散能量[J].地震工程与工程振动,2002,22(5):152-155.
[5]Roberto Villaverde.Aseismic roof isolation system:feasibility study with 13-story building[J].Journal of Structural Engineering,2002,128(2):188-196.
[6]祁皑,林云腾,郑国琛.层间隔震结构工作机理研究[J].地震工程与工程振动,2006,26(4):239-243.
[7]郑国琛,祁皑,阎维明.加层减震结构振动台试验分析[J].地震工程与工程振动,2007,27(2):164-170.
[8]马万成,加层减震结构的理论分析与振动台试验研究[D].广东:广州大学,2006.5.
[9]刘礼君.基于能量的轻钢加层“TMD减震”参数优化研究[D].江西:华东交通大学,2008.6.
[10]周云.粘弹性阻尼减震结构设计[M].武汉:武汉理工大学出版社,2006.
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