基础隔震结构屋面突出物的水平地震作用研究

Horizontal earthquake effects on small towers of a seismic-isolation building

根据《建筑抗震设计规范》(GB50011-2001)和《叠层橡胶支座隔震技术规程》(CECS126:2001),在理论分析基础上,得到采用等效侧力法时屋面突出物水平地震作用修正系数βn的表达式。指出βn的控制因素为突出物与主体结构的质量比α和突出物和隔震层间刚度比β。并仿照《高层建筑混凝土结构技术规程》(JGJ3-2002),得到基础隔震结构屋面突出物水平地震作用修正系数βn的实用表格。同时基于有限元理论的振型分解反应谱法建立模型计算,给出了修正系数。通过算例分析,可知结果可供工程中使用。

Based on code for a seismic design of buildings(GB50011-2001)and technical specification for rubber isolation bearing(CECS 126:2001),the correction coefficient formulas was deduced by using theoretical analysis adopting equivalent lateral analysis methods.It was pointed out that the controlling factors of correction coefficient include the mass ratio between the tower and the main structure,and the story stiffness ratio between the isolation layer and the tower.A correction coefficient table was supplied for design according to technical specification for concrete structure of tall building(JGJ3-2002).Mode superposition method based on finite element model was used to compute seismic effects,a correction coefficient table was presented.The result was applicable for practical design.