正交异性钢板-超薄RPC组合桥面板结构的抗弯疲劳性能试验  

Experiment on Flexural Fatigue Performance of Composite Deck System Composed of Orthotropic Steel Deck and Ultra-thin RPC Layer

作　　者：刘梦麟[1] 邵旭东[1] 张哲[1] 胡佳[1] 

机构地区：[1]湖南大学桥梁工程研究所,湖南长沙410082

出　　处：《公路交通科技》2012年第10期46-53,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178711);交通运输部重大科技专项项目(2011318494160);湖南省研究生科研创新项目(CX2011B150)

摘　　要：针对正交异性钢桥面的传统沥青混凝土铺装层经常出现各种病害的技术难题,提出了一种新型组合桥面体系,即通过剪力钉构成正交异性钢桥面板和活性粉末混凝土(RPC)板之间的可靠界面连接,形成2种板共同受力的组合桥面。以虎门大桥桥面改造为工程背景,对此种组合桥面进行了理论分析和桥面板条带足尺模型疲劳试验。研究结果表明:经过200万次疲劳试验后,RPC板未产生任何新的裂缝,初始裂缝未扩展,试验梁刚度无明显下降。当RPC最大控制应力σmax=9.6 MPa时,其剩余弯拉强度为42.8 MPa;σmax=14.4 MPa时,其剩余弯拉强度为25.6MPa。这证明了该组合桥面具有优良的抗弯疲劳性能,具备应用于虎门大桥的技术可行性。In order to solve the technical problem of conventional asphalt concrete pavement failure often occurring in orthotropic steel bridge deck, an innovative composite bridge deck system was proposed, which consists of an orthotropic steel deck stiffened with reactive-powder-concrete （RPC） layer through stud shear connectors. Theoretical analysis and full-scale bridge deck model fatigue tests were performed based on the engineering background of steel bridge deck transformation in Humen Bridge. The research result indicates that （ 1 ） no new crack occurs, initial cracks do not evolve and the stiffness of test beam does not decline obviously after bearing 2 x 106 load cycles; （2） the residual flexural-tensile strength of RPC is 42. 8 MPa when the RPC maximum stress trm,x is 9. 6 MPa and it is 25.6 MPa when the RPC maximum stress is 14.4 MPa. This shows the excellent flexural fatigue performance of the composite bridge deck system, it is technically feasible for Humen Bridge.

关 键 词：桥梁工程 抗弯疲劳性能 模型试验 组合桥面板 掺钢纤维配筋RPC 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]