非一致性地震作用下跨越地裂缝结构的动力响应研究

摘要

The activity of ground fissures in Xi'an weakens gradually and tends to be stable.Taking the ground fissure f4 in Tangyan Road as the research object,the finite element type selection of the spanning ground crack structure was carried out.Various parameters of a refined model in the structure across ground fissure were analyzed quantitatively by using ABAQUS software.Then,the 3D solid refined models of the frame structure in common site and ground fissure site were established,which considered the position and quantity of rebar.The calculated results were compared with the results of shaking table test for ground fissure.Based on the quantitative analysis of the displacement and displacement angle of the frame,the influence of the ground fissure on the frame structure under excitation of the non-uniform seismic was obtained.Calculation results show that the existence of ground fissure aggravated the damage of the superstructure during earthquake,and the seismic response of the structure is related to the type of earthquake,the intensity of the earthquake,and the location of the floor.In addition,along with the increase of seismic intensity,the dynamic response of the ground fissure increased significantly.%在西安市地裂缝活动性逐渐减弱并趋于稳定的背景下,以西安唐延路地下人防工程处f4地裂缝为研究对象,进行了跨越地裂缝结构有限单元类型选择,利用有限元ABAQUS分析软件建立了普通场地和地裂缝场地上考虑配筋位置和数量的三维实体框架结构精细化模型,并将计算结果与地裂缝振动台模型试验结果进行了对比.通过框架结构层间位移及位移角定量分析,找出了非一致地震激励下地裂缝对上部框架结构的影响规律.计算结果表明,地震作用时地裂缝的存在加剧了上部结构的破坏,跨地裂缝结构的地震响应与地震类型、地震强度、楼层位置有关.随着地震强度的增大,跨地裂缝结构动力响应显著增大.