形截面钢构件铰区模型及铰区长度

Hinge zone model of H-section steel members and hinge zone length

摘要:

将局部失稳的集中区域定义为铰区.提出了由局部失稳控制破坏模式的H形截面铰区平均曲率的计算公式.发现铰区长度主要依赖于截面构型及轴力大小，用归纳方法得到了考虑不同截面构型及加载条件影响的铰区长度计算方法.实现了从H形截面悬臂钢构件模型中提取扣除计算长度影响的截面层次的弯矩曲率关系.该弯矩曲率关系作为不同受力形式、不同构件长度及边界条件的构件非线性分析的基础，可提高结构体系非线性分析的分析效率，并满足工程研究的精度要求.

Abstract:

Characteristic properties of the hinge zone, defined as the concentration area of local buckling, were carefully investigated in this paper, based on which the calculation equation for the mean curvature of the hinge of Hsections failed by local buckling was proposed. Because the length of hinge zone is dependent on sectional configuration as well as axial force ratio, the calculation method for the hinge zone length considering the effects of sectional configuration and loading conditions was put forward by induction. Thus, the relationship of crosssectional momentcurvature eliminating the effect of member length of Hsections according to arbitrary cantilever beamcolumns was obtained. It is noted that such momentcurvature can be applied to nonlinear analysis of members with different loading conditions, lengths and boundary conditions, hence the nonlinear analysis efficiency of steel structures can be improved with satisfactory accuracy for engineering study.