拉挤GFRP型材层合板螺栓连接试验  

Experiment on Bolted Joints of Pultruded GFRP Laminates

作　　者：刘玉擎[1] 都骜 辛灏辉[1] 左一泽[1] LIU Yu-qing DU Ao XIN Hao-hui ZUO Yi-ze(Department of Bridge Engineering, Tongji University, Shanghai 200092, Chin)

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《中国公路学报》2017年第6期223-229,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51578406);交通运输部建设科技项目(2013 318 822 370)

摘　　要：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 investigate the failure modes and load-carrying capacity of pultruded glass fiber reinforced polymer （GFRP） laminates used in the bridge engineering, tensile tests were conducted on 36 single-lap specimens with single bolt by regarding the bolt-diameter to plate- thickness ratio （1. 0, 1. 2, 1. 4）, splice plate configuration （GFRP-GFRP, GFRP-steel） and loading direction （longitudinal. parallel to the pultrusion direction, transverse, perpendicular to the pultrusion direction） as variable parameters. Based on the results of load-displacement, load- strain curves and failure modes, the influence of test parameters on the mechanical performance of bolted joints of pultruded GFRP laminates was analyzed. The results show that as for joint failure modes, in longitudinal joints, GFRP-GFRP specimens with connecting diameter of 14 mm suffer from the bearing failure, and other test groups, including GFRP-GFRP and GFRP-steel joints exhibit bolt failure. While in the transverse joints, GFRP-GFRP joints suffer from net-section tension-bending failure, but GFRP-steel joints exhibit net tension failure. Joint strength and stiffness increase with the raising bolt-diameter to plate-thickness ratio. Compared with GFRP- GFRP joints, GFRP-steel joints can better restrain secondary bending of the single-lap bolted joint and increase joint stiffness. For the zero-dominated pultruded GFRP laminates, longitudinal joints show higher strength and stiffness than transverse joints but present relatively poorer secondary bending effect.

关 键 词：桥梁工程 螺栓连接 模型试验 拉挤GFRP型材 承载性能 

分 类 号：U444[建筑科学—桥梁与隧道工程]