GFRP肋式剪力连接件受力性能对比试验研究  

Comparative analysis of push-out tests for two kinds of GFRP shear connectors

作　　者：黄海林[1] 李遨 祝明桥[1] 郭原草[1] 曾垂军[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《土木建筑与环境工程》2016年第5期34-42,共9页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(51308207;51378202);湖南省教育厅项目(14C0439)~~

摘　　要：剪力连接件是保证GFRP混凝土组合梁/板中两种不同材料共同工作的重要构造,设计了矩形肋和T形肋两类GFRP肋式剪力连接件,进行了3组共8个GFRP肋式剪力连接件的推出试验,包括:矩形肋开孔、T形肋开孔、T形肋不开孔3组GFRP肋式剪力连接件,得到了其破坏形态、极限承载力、荷载滑移曲线及荷载应变变化规律,重点研究肋内开孔及肋的截面形式对GFRP肋式剪力连接件受力性能的影响。试验结果表明:GFRP肋式剪力连接件的破坏形态均为混凝土劈裂破坏;对比矩形肋开孔试件,T形肋开孔试件强度高、延性好;对比T形肋不开孔试件,T形肋开孔试件强度与延性均能提高。基于试验结果,建立了考虑肋内开孔及肋截面形式影响的GFRP肋式剪力连接件极限承载力计算公式,拟合得到了GFRP肋式剪力连接件的荷载滑移曲线上升段的理论模型,建立了其抗剪刚度计算公式。Shear connectors are the important detailings affecting the mechanical properties of GFRPconcrete composite beams/decks.Rectangular rib and T-type rib GFRP shear connectors are put forward to improve the interfacial bond properties between GFRP and concrete.Eight push-out tests are conducted to evaluate the mechanical behaviors of two rectangular perforated rib GFRP shear connectors and three Ttype perforated rib GFRP shear connectors,as well as three T-type rib GFRP shear connectors.The failure patterns,ultimate bearing capacities,load-slip behaviors and load-strain regularities are obtained by contrast tests.Results show that T-type perforated rib GFRP shear connectors show higher strength and better ductility than rectangular perforated rib GFRP shear connectors,and T-type perforated rib GFRP shear connectors show higher strength and better ductility than T-type rib GFRP shear connectors.An empirical equation to predict the ultimate shear resistance is proposed and validated by the experimentaldata.Idealized load-lip models and equations to predict the load versus slip relationship for all specimens are proposed.Curve fittings are performed to find fitting parameters for all tested specimens and the results show a very good correlation with those of the experiments.An empirical equation to predict the shear rigidity is proposed.

关 键 词：组合结构 肋式剪力连接件 推出试验 破坏机理 粘结滑移 

分 类 号：U443[建筑科学—桥梁与隧道工程] TU398[交通运输工程—道路与铁道工程]