单层球面网壳与支承结构整体强震失效特征

于志伟, 支旭东, 范峰, 沈世钊

哈尔滨工业大学土木工程学院



摘要:

为了研究支承结构对单层球面网壳在强震作用下失效特征的影响,建立了更为精细化的数值模型.采用动力荷载域全过程分析方法研究了单层球面网壳与支承结构整体在强震作用下的特征响应,得到了考虑下部支承结构的单层球面网壳在强震作用下两种不同的失效特征,并建立了网壳结构极限承载力的判别准则,研究了下部支承结构、矢跨比、屋面质量等参数对网壳结构在强震作用下动力响应的影响.结果表明:下部支承对网壳结构在强震作用下的失效特征有显著的影响;随网壳矢跨比和屋面质量减小,结构的极限承载力显著提高,并且塑性程度加深,延性增强.

关键词:  网壳结构  支承结构  失效特征  极限承载力  强震作用

DOI：10.11918/j.issn.0367-6234.2010.10.002

分类号:TU399

基金项目:国家自然科学基金重大研究计划重点资助项目(90715034);哈尔滨工业大学优秀青年教师培养计划资助项目(HITQNJS.2007.029)



Failure behavior of reticulated domes with substructures subjected to the severe earthquake

YU Zhi-wei, ZHI Xu-dong, FAN Feng, SHEN Shi-zhao

School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China

Abstract:

In order to investigate the influence of substructures on the failure behavior of steel reticulated domes subjected to severe earthquake,this paper built a more accurate numerical model.Applied on the fullrange dynamic response analysis method,two typical failure modes of reticulated domes with substructures were illustrated according to the rigidity of substructures.A Failure criterion was proposed to estimate the ultimate load of the single layer reticulated dome.It is observed that reticulated domes with rigid and flexible substructures have higher ultimate load compared with those with medium rigidity of substructures.The ultimate load increases with the decrease of the rise-span ratio and roof load.

Key words:  reticulated dome  substructure  failure characteristic  ultimate load  severe earthquake