索撑单层球面网壳多点地震输入下的失效特征研究

张中昊1,2,支旭东2,范峰2,李玉刚3

振动与冲击 ›› 2021, Vol. 40 ›› Issue (22) : 60-65.

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (22) : 60-65.
论文

索撑单层球面网壳多点地震输入下的失效特征研究

  • 张中昊1,2,支旭东2,范峰2,李玉刚3
作者信息 +

Dynamic failure of a cable-stiffened single layer two-way grid dome under seismic multi-support excitations

  • ZHANG Zhonghao1,2,ZHI Xudong2,FAN Feng2,LI Yugang3
Author information +
文章历史 +

摘要

在双向网格型单层球面网壳的面内外布置拉索可有效地增强结构的刚度从而提高结构的承载能力,提出一种新型索撑网壳结构。本文针对60m跨度索撑单层球面网壳,采用位移时程分析方法,研究结构在一致输入下和考虑地震动空间变化性的多点输入下的地震响应及其失效特征。通过关键节点的荷载位移响应、网壳杆件进入塑性比例、网壳损伤程度等指标考察不同地震荷载幅值下网壳结构的破坏形式,揭示索撑单层球面网壳结构的动力失效机理。结果表明:拉索的布置有效地增强了网壳结构的延性,在网壳发生较大位移时,结构不但没有发生破坏并能继续承受更大的地震荷载。一致输入下网壳杆件是从球面四个端点区域开始进入塑性,多点输入下网壳杆件塑性发展从支座处外环开始逐渐向内环发展。对比一致输入,多点输入下网壳动力极限荷载大幅度降低,说明索撑网壳结构体系受地震动空间变化影响较大。网壳破坏形式为强度破坏,多点输入下结构的强度破坏特征更为显著。

Abstract

The arrangement of in-plane and out-of-plane cables effectively enhances the stiffness of the two-way grid dome structure and improves the bearing capacity. In this paper, the seismic response and failure characteristics of 60m span cable-stiffened single-layer spherical reticular shell under uniform and multiple-support excitations by considering the spatial variation of ground motion are analyzed. Based on the load displacement response of key nodes, the plastic proportion of the lattice shell member, and the damage degree of the latticed shell, the failure forms of the lattice shell structure under different seismic load amplitude were investigated, and the dynamic failure mechanism of the single-layer spherical lattice shell structure was revealed. The results show that the in-plane and the out-of-plane cables effectively enhances the ductility of the lattice shell structure. Even if the reticulated shell has a large displacement, the structure still not fail. The reticular shell members enters into plasticity from the four end areas under uniform excitation, and the members of reticular shell gradually enters into plasticity from the periphery support and develops to the inner ring under multi-support excitation. Compared with the uniform excitation, the critical load of the two-way grid shell under multi-support excitation is greatly reduced. The failure forms of reticular shell are all strength failure, and the failure characteristics under multi-support excitation strength are more obvious.

关键词

双向网格 / 拉索 / 一致输入 / 多点输入 / 动力失效

Key words

 two-way grid / cable / uniform excitations / multi-support excitations / dynamic failure

引用本文

导出引用
张中昊1,2,支旭东2,范峰2,李玉刚3. 索撑单层球面网壳多点地震输入下的失效特征研究[J]. 振动与冲击, 2021, 40(22): 60-65
ZHANG Zhonghao1,2,ZHI Xudong2,FAN Feng2,LI Yugang3. Dynamic failure of a cable-stiffened single layer two-way grid dome under seismic multi-support excitations[J]. Journal of Vibration and Shock, 2021, 40(22): 60-65

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