水平地震作用下不对称不规则结构抗扭设计方法研究

对水平地震作用下不对称不规则结构的抗扭设计进行了详细分析与研究。结果表明,设计这类结构时应主要考虑:由楼板(刚性隔板)的扭转角引起的竖向构件的扭转不超过许可值;边端框架或剪力墙的层间位移角应小于规范限值;控制不同烈度地震作用下的楼板平面内应力在许可范围内。从楼层扭转位移比的定义,楼层扭转角与楼层质心距端部框架或剪力墙距离之积,可以看出现行抗震规范仅采用扭转位移比来控制楼层的扭转是不够的。

Torsional Design Method of Asymmetric and Irregular Building Under Horizontal Earthquake Action

Based upon elaborate analysis on torsional design methods of asymmetric and irregular structure under horizontal earthquake action,it points out that the main design principles of an asymmetric building subjected to horizontal earthquake are:the torison of vertical members induced by the torsional angle of the floor (rigid diaphragm) can not exceed the allowable value,the inter-story displacement at outermost frame or shear wall should be less than that required by design code,stresses in plane of the slab should be controlled within acceptable extent under different intensity earthquakes.That current seismic design code only utilizes the torsional displacement ratio to control the floor torision,which seems not reasonable enough since its connotation is the multiple of the floor torsional angle and the distance of floor mass center to the edge frame or shear wall.