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考虑钢-混凝土界面完全粘结和自由滑移2种极限状态,研究矩形钢管混凝土构件受弯过程的截面中和轴平移规律,并基于平截面假定,分别给出2种界面状态下构件抗弯承载力、抗弯刚度的理论计算方法。同时,针对钢管与核心混凝土界面平均粘结强度,分析抗弯构件在界面脱粘时的有效受压区高度。研究结果表明:矩形钢管混凝土的界面脱粘导致核心混凝土的抗弯承载力过早失效,构件的整体抗弯刚度和承载力降低;高宽比越大,钢管混凝土梁的整体钢管与混凝土之间的界面状态性能对构件抗弯承载力的影响越明显;实际中核心混凝土在未达到极限受压强度前与钢管发生脱粘,为充分利用核心混凝土的材料强度,应对矩形钢管混凝土的界面粘结进行构造加强。
Considering the two kinds of ultimate states of complete bonding and free sliding of the steel-concrete interface, the law of the neutral axis of the section of the CFST member under bending is studied. Based on the assumption of the flat section, the bending behavior of the members under two kinds of interface states Bearing capacity, bending stiffness of the theoretical calculation method. At the same time, according to the average bond strength between the steel pipe and the core concrete, the effective compression zone height of the flexural members at the interface debonding is analyzed. The results show that the interfacial debonding of rectangular CFST leads to the premature failure of the core concrete flexural capacity and the decrease of the overall flexural rigidity and bearing capacity of the CFST. As the aspect ratio increases, Of the interface state performance of the more obvious impact on the flexural capacity of the component; in fact, the core concrete does not meet the ultimate compressive strength before debonding with the steel pipe, in order to make full use of the core concrete strength of the material, to deal with the rectangular steel pipe concrete interface bonding To strengthen the structure.