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在单调轴向荷载作用下使用9个焊接方形截面内填混凝土箱形柱模型进行测试。用有限元分析软件ABAQUS模拟荷载试验,并证实了有限元模型的可行性。根据试验和有限元模型的模拟结果可得出如下结论:明确箱形柱内填混凝土的混凝土约束机能的发展过程;混凝土破碎发生后,由水平拱提供的混凝土约束变得显著;柱壁发生屈曲后,由垂直拱提供给混凝土更多的额外约束;水平拱和垂直拱的共同作用提供了重要的混凝土约束,以获得并修复混凝土的强度;柱壁较大的宽厚比会导致垂直拱的初期发展;从混凝土约束机能来看,荷载-轴向应变曲线中,混凝土构件将会有强度降低和强度修复的过程;Mander混凝土约束模型和Sakino混凝土分析模型并不能合理地预测箱形柱内填混凝土的混凝土应力-应变性能。
In the monotonic axial load of 9 welded square cross-section filled concrete box column model for testing. The finite element analysis software ABAQUS was used to simulate the load test and the feasibility of the finite element model was verified. According to the simulation results of the experiment and the finite element model, the following conclusions can be drawn: The development process of concrete confinement function of concrete filled with box column is clarified; the concrete confinement provided by horizontal arch becomes significant after the concrete is broken; After the vertical arch provides more additional constraints on the concrete; the combination of horizontal arch and vertical arch provides important concrete constraints to obtain and repair the concrete strength; larger wall thickness ratio will lead to the initial vertical arch In the load-axial strain curve, the concrete members will have strength reduction and strength restoration process. The Mander concrete confinement model and the Sakino concrete analysis model can not reasonably predict the concrete filled box column Concrete Stress-Strain Properties.