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为研究Q690高强钢焊接箱形轴心受压构件的整体稳定性能,给出适合该类构件的设计建议,通过对3根Q690焊接箱形截面试件的残余应力试验,得到了箱形截面的残余应力分布模型。设计并制作了5根Q690焊接箱形柱,并对其两端铰支条件下进行了轴压试验研究,试验前分别对试件的几何初始缺陷和初始偏心均进行了测量。轴压试验中,所有试件破坏形式均为整体失稳破坏。基于试验结果,分析了该试件的整体稳定性能,采用直接分析法建立了数值模型,并校验了数值模型的准确性。同时,采用该数值模型对箱形轴压构件进行了参数分析,基于试验和参数分析结果,给出了Q690焊接箱形轴压构件的一阶弹性设计建议。
In order to study the overall stability of Q690 high-strength steel welded box-shaped axial compression member, the design recommendations for this kind of member are given. Through the residual stress tests of three Q690 welded box-shaped cross-section specimens, Residual stress distribution model. Five Q690 welded box-shaped columns were designed and fabricated. The axial compression tests were carried out on both ends of the box. The geometric initial imperfections and initial eccentricities of the specimens were measured before the test. In the axial compression test, the failure modes of all the specimens are all destabilized. Based on the test results, the overall stability of the specimen was analyzed. The numerical model was established by direct analysis and the accuracy of the numerical model was verified. At the same time, this numerical model was used to analyze the parameters of the box-axis compression member. Based on the experimental and parametric analysis results, the first-order elastic design suggestion of the Q690 welded box-shaped axial compression member was given.