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通过钢管混凝土单圆管拱架模型的面内加载试验,基于试验结果对拱架模型的变形、应变、承载特性及可缩节点增阻规律进行了研究。试验结果表明:由于钢管和混凝土协同工作,钢管混凝土支架具有较好的弹塑性和承载能力;支架初始缺陷或局部弱化往往是造成支架失稳破坏的重要原因;可缩节点增阻曲线可以分为3阶段,支架滑移后承载力出现波动,应根据现场监测适时对可缩节点进行紧固增阻。最后采用ABAQUS有限元软件对拱架模型的承载和变形特性进行了模拟分析,计算结果与试验值比较接近。
Through the in-plane loading test of CFST single-tube arch model, the deformation, strain and bearing characteristics of the arch model and the rules of the drag reduction of the node were studied based on the test results. The test results show that the concrete-filled steel tube supports have good elasto-plasticity and bearing capacity due to the cooperation of the steel pipe and concrete. The initial defects or local weakening of the supports are often the main reasons for the instability of the supports. In stage 3, the bearing capacity fluctuates after the sling slides, and the shrinking point should be tightened and dragged according to the on-site monitoring. Finally, the load-bearing and deformation characteristics of the arch frame model were simulated by ABAQUS finite element software. The calculated results are close to the experimental values.