锈蚀对网壳结构抗连续性倒塌性能的影响

Effect of Corrosion on Continuous Collapse Resistance of Reticulated Shell Structures

发生在水泥生产线建(构)筑物空间网格结构节点、支座处的锈蚀易导致相关的杆件失效,引发建(构)筑物空间网格结构连续性倒塌。通过有限元数值模拟,研究了实际服役结构在不同锈蚀年限下抗连续性倒塌性能的变化情况。动力响应过程中单层网壳结构最大应力达到静力作用下的1.5倍,部分杆件屈服,相邻节点位移达结构跨度的1/500~1/300。双层球面网壳结构冗余度高,抗连续性倒塌性能较好。

Corrosion on the node or support of the spatial grid structure in cement production lines can easily lead to the failure of the related rods,causing the continuous collapse of the spatial grid buildings(structures).Finite element numerical simulation is used to study the continuous collapse resistance of structures in service under different corroded years.In the dynamic response process,the maximum stress of single-layer reticulated shell reaches 1.5 times of that under static action,some members yield,and the displacement of adjacent joints reaches 1/500 to 1/300 of structural span.The double-layer spherical reticulated shell structure has higher redundancy and better resistance to continuous collapse.