方钢管框架钢板剪力墙核心筒结构抗倒塌分析

Collapse resistance analysis of steel shear wall core tube structure with square steel tube frame

为研究方钢管混凝土框架-钢板剪力墙核心筒结构的抗连续倒塌性能,建立一栋15层原型结构,在不同初始损伤模型下采用拆除构件法对结构进行非线性动力分析,得到失效节点竖向位移时程曲线以及失效柱范围内梁、柱内力变化情况。研究表明:底层内柱失效后节点竖向位移最大,底层筒体柱失效后节点竖向位移最小;底层柱失效后,内力重分布主要发生在失效柱相邻跨范围内,梁柱内力均增大,荷载传递遵循就近原则;结构在不同抽柱工况下均未发生倒塌,其中内柱属于最不利位置。

In order to study the progressive collapse resistance of concrete filled square steel tubular frame-steel plate shear wall core tube structure,a 15-story prototype structure is established. Under different initial damage models,the non-linear dynamic analysis of the structure is carried out by demolition component method,and the vertical displacement time history curve of the failure joint and the change of the internal force of the beam and column in the failure column range are obtained. The results show that the vertical displacement of the joint is the largest after the failure of the bottom inner column and the smallest after the failure of the bottom cylinder column.The redistribution of the internal force mainly occurs in the adjacent span of the failure column,the internal force of the beam and column increases,and the load transfer follows the principle of proximity after the failure of the bottom column. The structure has not collapsed under different pulling-out conditions,and the inner column is the most disadvantageous position.