设计参数对双钢板混凝土偏压构件受力性能的影响

Effects of design parameters on mechanical properties of eccentrically loaded double-steel-plate-concrete members

为探究管幕预筑结构受力机理,对双钢板混凝土偏压构件受力性能进行研究。完成了4根双钢板-混凝土组合构件的偏压试验,建立有限元模型,通过计算结果与试验结果的对比,验证了模型的正确性和可靠性。以端部约束形式、界面连接形式、偏心距为参数进行数值分析,结果表明:钢板混凝土偏压构件中,当端部约束足够强(看作刚臂)时,混凝土与两侧钢板共同参与受力,截面应变基本符合平截面假定,不存在界面滑移,在不考虑屈曲的前提下,连接件的设置对构件承载力没有影响,承载力最高;当端部约束不够强,外荷载不能同时作用在混凝土和两侧钢板上时,在钢板与混凝土间设置连接件可提高构件的承载力,钢板与混凝土界面设置为合并重合结点时,构件承载能力最高。

To investigate the stress mechanism of pipe-roof pre-construction structure,the force performance of the double-steel-plate-concrete biased members was explored.The test of four double-steel-plate-concrete composite members was completed,and the finite element model was established.The correctness and reliability of the model were verified by comparing the calculation results with the test results.The numerical analysis took the form of end restraint,the form of interface connection,and eccentricity as parameters.The results show that in the steel-steel-concrete eccentric compression member,when the end restraint is strong enough,concrete and steel plates on both sides participate in the force work together,and there is no interface slip.Without considering the buckling,the setting of the connector does not affect the bearing capacity of the member,and the bearing capacity is the highest at this time.When the end restraint is not strong enough and the external load cannot act on the concrete and the steel plates on both sides at the same time,setting a connector between the steel plate and concrete can improve the bearing capacity of the member.When the coincident nodes on the interface between steel plate and concrete are combined into the same node,the bearing capacity is the highest.