多层框架结构利用铅芯叠层橡胶支座加层减震分析

Seismic analysis of a multi-storey RC frame with adding-storey and lead laminated rubber bearings

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2条实际地震动记录和1条人工波对加层结构进行了抗震分析。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 with lead laminated rubber bearings. A program is developed with MATLAB language so as to conduct elasto-plastic time history analysis of the structure, 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 into the structure. The results show that displacement and acceleration response, interstorey shear force and story drift of each storey are all decreased for comparing to those results before adding-storey, and displacement response is decreased especially significantly. The numerical example also demonstrates the effectiveness and rationality of proposed energy-based optimization criterion. This adding-storey technique increases effective use area of floor and improves the seismic capacity of existing building, and then it has good application prospect in the upgrading of medium and low-rise buildings