折线形钢箱柱受力性能试验研究

Experimental research on load-carrying behavior of zigzag welded box column

为研究折线形钢箱柱的受力性能,对其进行了设计验证和受压极限承载力的缩尺模型试验研究和有限元分析。试验结果表明:折线形钢箱柱在设计荷载作用下,始终处于弹性状态;在受压极限承载力试验中,折线形钢箱柱的破坏形态为钢箱柱折线相交部分的内折点处发生局部屈曲,导致试件变形过大而丧失承载能力。结合试验结果与有限元计算结果,分析了折线形钢箱柱的受力变形特征和内力分布规律。通过对比分析折线形钢箱柱的破坏形态及位置、荷载-位移曲线、极限承载力等,试验结果与有限元计算结果吻合良好,验证了理论分析与原型结构设计的正确性。

In order to investigate the mechanical performance of zigzag welded box columns,a scaled model test and FEA were carried out to validate the design and the ultimate bearing capacity.Experimental results show that the test specimen under the design loads is in elastic state.In the ultimate bearing capacity test,the failure mode of the column is that local buckling occurred in the inner corner of specimen which led to great deformation and the lost of load-carrying capacity.According to the results of the test and the FEA,the force distribution,deformation characteristics and ultimate bearing capacity of the specimens were analyzed.The analysis shows that the experimental results match well with the finite element analysis results.The test results demonstrate the correctness and reliability of the theoretical analysis and the original model of structural design.