双向速度脉冲地震下偏心重力柱核心筒结构的弹塑性地震响应研究

研究速度脉冲地震和结构质量偏心综合不利条件下新型重力柱-核心筒结构体系的弹塑性反应规律。选取速度脉冲和非速度脉冲地震加速度记录各10条，进行地震动双向输入，采用结构非线性分析软件CANNY进行有限元数值分析，研究脉冲型地震和结构质量偏心对新型体系弹塑性地震反应的影响。分析结果表明，速度脉冲型地震作用下各结构的层间位移角、层间剪力和层间扭转角显著高于非速度脉冲地震下的相应值。质量偏心对结构弹塑性抗震需求影响显著，层间位移角和层间扭转角都随着偏心率的增大而增大，而层间剪力则随偏心率的增大呈减小趋势。建议在重力柱-核心筒结构设计中应重视速度脉冲地震和结构偏心的耦合不利影响。

Elastoplastic seismic response of an eccentric gravity column core tube structure subjected to bidirectional pulse like ground motion

The elastoplastic response of a new type of gravity column core tube structure system was studied by considering comprehensive adversary conditions of pulse like ground motion and structural mass eccentricity. Ten pulse like and ten non pulse like ground motion acceleration records were selected as bidirectional seismic input. The structural nonlinear analysis software CANNY was used to conduct a finite element numerical analysis, and the effects of pulse like ground motion and structural mass eccentricity on the elastoplastic seismic response of the new structure were investigated. The analysis results indicate that the story drift ratio, shear force, and inter story torsion angle under pulse like ground motions are remarkably higher than those under non pulse like ground motions. Besides, mass eccentricity apparently affects the elastic plastic seismic demand of the structure. With the increase in eccentricity, the story drift ratio and inter story torsion angle increase while the inter story shear decreases. It is recommended that attention should be paid to coupling adversary influence of pulse like ground motion and structural mass eccentricity during the design of the gravity column core tube structure.