基于下部支承分离式设计的大跨度网壳结构抗震性能研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (3) : 237-242.

论文

杨大彬1，云超光1，吴金志2，张毅刚2

作者信息 +

Aseismic performance of large span latticed domes with separated substructures

YANG Dabin1, YUN Chaoguang1, WU Jinzhi2, ZHANG Yigang2

Author information +

文章历史 +

摘要

大跨空间结构的历次震害表明，上部屋盖和下部混凝土支承连接处的破坏是其主要震害类型之一，为了降低该种震害的可能性，提出了将下部支承结构分为可承受屋盖水平及竖向荷载的部分和只承受屋盖竖向荷载部分的分离式设计方法，前一部分下部支承宜采用弹性变形较大的钢结构，后一部分下部支承和屋盖通过水平滑动支座相连，由于水平剪力的释放而使该部分支座震害可能性降低。基于该设计思路建立了典型的单层网壳及下部支承模型，基于现行规范对其进行了小震和大震下的计算分析，结果表明：网壳及承担网壳水平和竖向荷载的下部支承部分可独立于只承受屋盖竖向荷载的下部支承部分单独计算，其计算结果和包含所有下部支承的整体模型结果相同；结构的温度应力可有效得到释放，小震及大震下抗震性能良好，用钢量较低。

Abstract

Damage of connecting place between upper roofs and bottom substructures are one of the main earthquake damages, as is shown in many earthquakes. To reduce the probability of this kind of damage, a separated substructure design method was proposed. The substructures were divided into two parts: one part sustaining horizontal and part vertical loads of the roof and the other part only sustaining the rest of vertical loads of the roof. The former substructure was connected with the roof using steel structures with larger elastic deformation. The latter substructure was connected with the roof using horizontal sliding bearings, so horizontal shear force was released to reduce the damage probability of bearings. FE models for a typical single-layer latticed dome and its bottom substructures were built based on this design idea. Their dynamic performances were computed under smaller and stronger earthquakes based on contemporary design codes, the results showed that the dome and the part of its bottom substructures sustaining horizontal and part vertical loads of the roof can be computed independently, and the dome’s temperature stress can be released effectively; the aseismic performances of the structure are good under smaller and stronger earthquakes; it costs less steel to be used.

导出引用

杨大彬1，云超光1，吴金志2，张毅刚2. 基于下部支承分离式设计的大跨度网壳结构抗震性能研究[J]. 振动与冲击, 2018, 37(3): 237-242

YANG Dabin1, YUN Chaoguang1, WU Jinzhi2, ZHANG Yigang2. Aseismic performance of large span latticed domes with separated substructures[J]. Journal of Vibration and Shock, 2018, 37(3): 237-242

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