型钢混凝土结构粘结滑移性能试验研究

进行了20榀试件的实腹式型钢混凝土粘结滑移性能的拉拔试验,分析了型钢与混凝土的粘结滑移机理、影响粘结滑移性能的主要因素以及沿锚固长度粘结应力和滑移量的分布规律,建立了型钢混凝土粘结强度和滑移量的计算公式,提出了型钢混凝土局部粘结破坏和整体粘结破坏极限荷载的计算原理与方法,根据混凝土板的冲切破坏理论,提出了确定临界保护层厚度的方法。研究成果为改进型钢混凝土结构的强度、刚度、变形、裂缝宽度计算理论以及进行这种结构的有限元分析提供了试验依据。

EXPERIMENTAL STUDY OF BOND-SLIP PERFORMANCE BETWEEN STEEL AND CONCRETE IN SRC STRUCTURES

Based on the experimental study of the bond-slip behavior between steel and concrete in SRC structures, the bond-slip mechanism between steel and concrete is analyzed and several important parameters are discussed. The distribution mode of bond stress and slip along the embedment length of steel and concrete interface, as well as the bond-slip relationship between the bond force and slip are also studied, and their equations are provided. The calculating method of bond strength, slip value and bond failure load are presented. Good agreement with the experimental results is reached. According to the punching failure principle of concrete slab, a determining method for critical thickness of concrete cover is proposed. The present results are believed to be useful for further study of bond-slip relationship and bond failure criterion between steel and concrete as well as the improvement of calculating theory of strength, stiffness, deformation, crack width and finite element analysis of SRC structures.