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为探明桥梁用拉挤型玻璃纤维增强复合材料(GFRP)层合板螺栓连接破坏模式与承载性能,以螺栓直径与板件厚度比(1.0,1.2,1.4)、搭接板件组成(GFRP-GFRP,GFRP-钢板)及荷载作用方向(纵向:平行于拉挤方向;横向:垂直于拉挤方向)为变化参数,进行了共计36个单搭接单螺栓连接拉伸试验。根据连接荷载-位移曲线、应变及破坏模式的测试结果,比较分析了各变化参数对拉挤GFRP层合板螺栓连接力学性能的影响。研究结果表明:对于连接破坏模式,纵向连接中,除GFRP-GFRP连接直径14mm试件组为销承压破坏,其余GFRP-GFRP,GFRP-钢板连接均为螺栓破坏;横向连接中,GFRP-GFRP连接为净截面拉伸-弯曲破坏,GFRP-钢板连接为净截面拉伸破坏;随着螺栓直径与板件厚度比增加,连接强度及刚度提高;GFRP-钢板连接相比GFRP-GFRP连接能更好地减小单搭接螺栓连接的二次弯曲效应,提高连接刚度;对于以0°方向纤维为主的拉挤GFRP层合板,纵向连接的强度及刚度均高于横向连接,纵向连接的次弯曲效应小于横向连接。
In order to find out the failure mode and bearing capacity of bolt connection of pultruded glass fiber reinforced plastic (GFRP) laminates for bridge, the bolt-to-plate thickness ratio (1.0, 1.2, 1.4) GFRP, GFRP-steel) and load direction (longitudinal: parallel to pultrusion direction; transverse: perpendicular to pultrusion direction) as a parameter of variation, a total of 36 single lap single bolt connection tensile test. According to the test results of connection load - displacement curve, strain and failure mode, the influence of each parameter on the mechanical properties of pultruded GFRP laminates was analyzed. The results show that for the connection failure mode, the GFRP-GFRP and GFRP-steel plate connections are damaged by bolts in the longitudinal connection, except the 14mm diameter GFRP- The connection is net-section tensile-bending failure, GFRP-steel plate connection is net-section tensile failure; As bolt diameter to plate thickness ratio increases, the connection strength and stiffness increase; GFRP-steel plate connection can be more than GFRP-GFRP The flexural strength and stiffness of pultruded GFRP laminates mainly in the direction of 0 ° are higher than those of transverse and longitudinal connections Bending effect is less than lateral connection.