单层球面网壳与支承结构整体强震失效特征

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.

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

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.