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为了探明截面形状不同对带有加劲肋钢箱型截面短柱弱轴方向最大承载力N-M关系曲线的影响,为该类结构设计提供科学的理论依据和基础。本文采用有限元分析方法,对带有加劲肋钢箱型截面构件在轴压和弱轴方向弯矩共同作用下的弹塑性性能进行研究。研究中,变化箱型截面宽厚比RR和长宽比L/B设计参数,建立20个有限元模型。为了探明各设计参数对钢箱型截面短柱弱轴方向最大承载力N-M关系曲线的影响,加载时考虑轴压和弯矩加载速率比β为0,1/3,1,3,∞等5种加载工况。研究表明:宽厚比RR对钢箱型截面短柱弱轴方向压弯最大承载力N-M相关曲线影响较大,RR越小结构的压弯最大承载力越大;L/B对压弯构件弱轴方向的N-M相关曲线也有一定的影响,随着L/B的增加,结构压弯最大承载力变小。
In order to find out the effect of different cross-sectional shapes on the N-M curve of maximum bearing capacity in the direction of the weak axis of stiffened steel box-sectioned short columns, it provides a scientific theoretical basis and foundation for the design of such structures. In this paper, the elasto-plastic properties of stiffened steel box section members subjected to bending moment in axial direction and weak axis are studied by using finite element method. In the study, 20 finite element models were established by varying the design parameters of aspect ratio RR and aspect ratio L / B. In order to find out the influence of each design parameter on the relationship between the maximum bearing capacity (NM) of the short axis of the steel box section and the load rate ratio β of the axial compression and bending moment is 0,1 / 3,1,3 and ∞ 5 kinds of loading conditions. The results show that the width-to-thickness ratio (RR) has a significant effect on the NM curve of the maximum bending bearing capacity (NM) in the direction of the weak axis of the steel box-section short column. The smaller the RR, the larger the maximum bending bearing capacity The NM correlation curve in the direction also has a certain influence. With the increase of L / B, the maximum bearing capacity of the structure buckling decreases.