中文摘要：

界面脱粘是钢-混凝土组合结构中的一种常见破坏方式，而一些研究结果表明钢．混凝土界面的脱粘可能是由能量控制的．本文将组合结构构件抽象为具有内部摩擦界面的弹性体，并将界面脱粘过程视为界面裂缝的扩展过程，基于断裂力学中的能量原理，得到了钢．混凝土界面脱粘过程中的能量关系，进而建立了基于能量的界面脱粘准则．用此准则进行了型钢混凝土拉拔试件的界面脱粘分析，分别建立了不考虑界面软化和考虑界面软化两种情况的界面脱粘模型，得到了两种情况下基于能量分析和基于强度分析的直接联系．结果表明，通过恰当的定义钢-混凝土界面等效粘结强度，基于强度的模型和基于能量的模型可以得到一致的结果．研究成果为钢．混凝土组合结构界面脱粘分析及其有限元模拟提供了理论依据．

英文摘要：

Debonding between steel and concrete is a common failure mode in composite structures, and it is indicated interfacial failure may be energy governed. Steel-concrete composite structural member is considered as a generalized elastic body with both the applied load and the interracial shear stress acting as boundary stresses, and the debonding process is modeled as crack propagation along the interface. According to energy principle, the energy relationship is discussed in the process of debonding and an energy-based criterion for steel-concrete composite structure is proposed. Debonding process is analyzed through energy-based criterion. The analysis is performed for special case with constant shear stress along debonded interface, and for the general case with shear stress softening respectively. A direct correspondence between energy-based and strength-based analyses can be established for arbitrary softening behavior along the interface. Through the proper definition of effective interracial shear strength, the strength-based approach can be employed to give the same results as the energy-based analysis.