冷弯薄壁钢类椭圆截面轴压构件设计方法

Numerical simulation and design of cold-formed steel oval hollow section compression members

摘要:

为研究冷弯薄壁钢空心类椭圆截面轴心受压构件的有限元数值模拟及设计方法,考察了现行冷弯薄壁钢结构设计规范中的有效宽度法对该类型截面构件的适用性.采用Abaqus建立冷弯薄壁钢空心类椭圆该模型可以准确地模拟此类构件的力学性能截面轴心受压构件的非线性有限元数值模型.有限元模型计算结果与试验结果的比较表明,该模型可以准确地模拟此类构件的力学性能.利用此模型进行了包括100个轴心受压构件的参数分析,参考现行的GB 50018—2002《冷弯薄壁型钢结构技术规范》及北美钢结构设计规范中的直接强度法计算以上构件的轴压承载力,并与试验和数值计算结果进行比较.结果证明直接强度法计算结果较准确,适用于此类构件的设计.

Abstract:

A research was performed on the numerical simulation and design of cold-formed steel oval hollow section compression members to investigate the applicability of existing design specification to the new section.A non-linear finite element model was developed using Abaqus.The numerical results were compared with the test results and it is shown that the numerical model accurately predicted the structural behavior of the compression members.Parametric study was performed using the verified model including 100 members with different cross-section dimensions and lengths.The test and numerical strengths were compared with the design strengths calculated using the current Chinese Code and direct strength method,which is included by the North American Specification for cold-formed steel structures.It is shown that the direct strength method can be used for the design of cold-formed steel oval hollow section members under axial compression.