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钢管混凝土界面间的粘结应力是钢管与混凝土间一种重要的相互作用。目前国内外对钢管混凝土的粘结应力和常温下的粘结滑移本构关系研究较多,而高温后钢管混凝土的粘结滑移本构关系的研究由于必须依靠大量试验,相关研究相对较少。然而,高温后结构力学性能对结构承载力影响非常重要,本文基于大量试验,并采用数据拟合的方法修正了试验结果的离散性,得到了高温后钢管混凝土的粘结滑移本构关系,为钢管混凝土的有限元分析奠定了基础。
The bond stress between the concrete-filled steel tube and concrete surface is an important interaction between steel pipe and concrete. At present, there are many studies on the bond stress of CFST at home and abroad and the bond-slip constitutive relationship at room temperature. However, the research on the bond-slip constitutive relationship of CFST after high temperature depends on a large number of tests. less. However, the structural mechanics performance after high temperature is very important to the bearing capacity of the structure. Based on a large number of experiments and the data fitting method, the discreteness of the test results is corrected and the bond-slip constitutive relationship of CFST is obtained. It laid the foundation for the finite element analysis of CFST.