考虑强弱轴影响的矩形钢管网壳结构弹塑性稳定性分析OACSTPCD

In single-layer reticulated shell structures,rectangular steel tubes have advantages over circular and square steel tubes in terms of structural rationality and the utilization of material properties due to the presence of strong and weak axis.Firstly,the stability of four shell surfaces under internal and external biaxial compression bending is compared and analysed.These four shell surfaces are composed of four types of steel tubes independently,which are circular steel tubes,H-shaped tubes,square steel tubes,and rectangular steel tubes.Then,the rectangular steel tube is used into the finite element model of the spring element of the prefabricated joint,and compared with the rigid joint model to study the influence of parameters such as the effects of joint region,joint stiffness,initial defect amplitude,and span-to-depth ratio on the stable bearing capacity of the structure.The results show that the stable stress of the rectangular steel tubes can be balanced in both directions,and the stable stress in the strong axis direction is lower than that of circular and square steel tubes with the same cross-sectional area.For members with strong and weak axes in the cross-section and full utilization of materials in both directions,the influence of the flexural stiffness in the weak axis direction cannot be ignored.