地震多点输入下K8单层球面网壳结构响应研究

地震动经过长距离传播到达结构场地时会存在空间变化,考虑地震动空间变化性的多点输入比一致输入更符合实际。采用时程分析法,计算不同屋面质量、不同矢跨比和不同杆件截面尺寸的90m K8单层球面网壳结构在多点输入下和一致输入下的地震响应,研究网壳结构地震空间相关性效应与结构参数的关系。分析结果表明:结构参数变化对多点输入下结构的拟静力响应和动力响应影响不同,致使地震动空间变化性对不同参数结构的影响有较大差异。通过系统的参数分析表明:轻质屋面、小矢跨比、大杆件截面尺寸网壳结构受地震空间变化影响较大。

Structural response analysis of K8 single-layer reticulated shell structures under multiple support excitations

Ground motion varies spatially after long distance propagation to the site,so multiple support excitation is more practical than uniform excitation.Using the time history analysis method,seismic response of 90m K8 single-layer reticulated shell structures,with different roof qualities,different rise-span ratios and different frame member sections,was calculated under multiple support excitation and uniform excitation,in order to study the relationship of seismic spatial correlation effect and structural parameters.The results show that: variations of structural parameters have different influences on quasi static response and dynamic response of the structures under multiple support excitation,so the influence of the spatial variation of ground motion on the structures with different parameters is greatly different.The reticulated shell structures with light-weight roof,small rise-span ratio and large frame member section,are greatly influenced by the spatial variation of ground motion.