小宽厚比短角钢填板双拼十字组合角钢轴压试验与设计方法对比

对于弯曲长细比大于扭转长细比的小宽厚比短角钢填板双拼十字组合角钢而言,各规范采用不同方法来计算其稳定系数,构造规定也有所不同,有必要结合试验实测及有限元计算结果,检验不同方法的计算精度和构造规定的合理性。首先针对11根双拼十字组合角钢进行了轴压试验,记录并分析了轴力、应变和位移的关键数据;然后采用有限元模型模拟了构件的轴压过程。最后对比了试验测试、有限元模拟及现有规范的结果,分析结果表明:螺栓滑移对构件稳定系数的影响可以忽略;当构件侧向支撑点之间仅为1个填板或相邻两个填板边缘螺栓的距离大于40倍的分肢角钢回转半径时,试件均表现出了良好的承载能力;按缀板式构件计算小宽厚比短角钢填板双拼十字组合角钢长细比并按B类柱子曲线确定其稳定系数比较合理。

Comparison of axial compression test and design method for small width-thickness ratio closely star-battened angle column of short steel battens

For the small width-thickness ratio closely star-battened angle column of short angle battens whose flexural slenderness is more than that of torsion,each specification uses different methods to calculate its stability coefficient,and the structural requirements are also different.It is necessary to combine the test results and finite element calculation results to verify the calculation accuracy of the different methods and the rationality of the structural requirements.Firstly,the axial compression tests were carried out on 11 closely star-battened angle steels,and the key data of axial force,strain and displacement were recorded and analyzed.Then the axial compression process of the component was simulated by finite element model.Finally,the results of experimental tests,finite element simulations and existing codes were compared.The analysis results show that the effect of bolt slip on the stability coefficient of components can be ignored.When the distance between the lateral support points of the component is only one batten or the distance between the adjacent two batten flange bolts is greater than 40 times the radius of split angle,the specimens all show good load-bearing capacity.It is reasonable to calculate the slenderness ratio of small width-thickness ratio closely star-battened angle column of short steel battens according to the batten plate and determine the stability coefficient according to the B-type column curve.