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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 study the mechanical properties of the box-column steel columns, the design verification and the ultimate-bearing capacity of the model test and the finite element analysis were carried out. The experimental results show that the box-shaped steel box column is always in elastic state under the design load. In the ultimate ultimate bearing capacity test, the failure form of the box-shaped steel box column occurs at the inflection point of the intersection of the steel box column and the broken line Local buckling, resulting in specimen deformation is too large and loss of carrying capacity. Combined with the test results and the finite element calculation results, the stress-strain characteristics and internal force distribution of the polygonal column steel columns are analyzed. By comparing and analyzing the failure shape and position, the load-displacement curve and the ultimate bearing capacity of the polygonal column, the experimental results are in good agreement with the finite element analysis, which proves the correctness of theoretical analysis and prototype structure design.