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为研究钢与GFRP-混凝土空心组合板通过不同连接方式形成组合梁的受弯性能,对3根组合梁试件进行了静载试验研究。3个试件中钢梁与GFRP-混凝土组合板间的连接方式分别为环氧树脂胶结及栓钉连接。通过比较不同连接方式下组合梁截面应变、跨中挠度、界面相对滑移的变化规律,验证了环氧树脂胶层及抗剪栓钉分别作为组合梁界面连接件的可行性。基于不同连接方式下组合梁的破坏模式,给出了栓钉连接方式下组合梁抗弯承载力的简化计算方法。研究结果表明:环氧树脂胶结组合梁的破坏模式为剪弯段GFRP板沿纵向剪切破坏,栓钉连接组合梁的破坏模式为典型的弯曲破坏;栓钉连接件较环氧树脂胶层表现出更高的界面剪切刚度;栓钉连接组合梁的抗弯承载力约为环氧树脂胶结组合梁承载力的2倍。
In order to study the flexural behavior of composite beams made of steel and GFRP-concrete hollow plates by different connection methods, three composite beams were tested under static load. The connection between the steel beams and the GFRP-concrete composite panels in the three specimens was epoxy cement and peg connection respectively. By comparing the variation of cross-section strain, mid-span deflection and interfacial relative slip of composite beams under different connection modes, the feasibility of using epoxy resin layer and shear studs as the interface of composite beam was verified. Based on the failure modes of composite beams under different connection modes, a simplified method for calculating the flexural capacity of composite beams with peg-joints is given. The results show that the failure mode of epoxy composite cemented beam is longitudinal shear failure of the GFRP plate in the bent section, and the failure mode of the peg-connected composite beam is a typical bending failure. Compared with the epoxy resin layer A higher interfacial shear stiffness is obtained. The flexural capacity of bolted composite beam is about twice that of epoxy bonded cemented beam.