钢-超薄UHPC组合桥面板界面抗剪性能研究

发布时间：2018-11-04 15:21

【摘要】：针对正交异性钢板-超薄超高性能混凝土(Ultra High Performance Concrete,UHPC)(厚度为35mmUHPC板+20mm磨耗层)组合桥面板中,UHPC层过薄而无法采用常规抗剪连接件形式的问题,提出一种新型钢筋网局部焊接抗剪连接件.通过推出试验测得了焊接抗剪件的荷载-滑移关系曲线和抗剪承载力,以某长江大桥为背景,对焊接抗剪件的布置方式进行了研究.试验结果表明:焊接抗剪件的推出试验破坏过程属于脆性破坏,破坏前界面相对滑移较小,焊缝长度为50mm的焊接抗剪件极限抗剪承载力为119kN.与栓钉相比,相同荷载比值下采用焊接抗剪件的界面相对滑移小,焊接抗剪件的抗剪刚度大于栓钉.计算结果表明:钢-超薄UHPC组合桥面板在布置抗剪件时,需关注UHPC层底部受力.加大抗剪连接件布置密度可减小UHPC层底部横、纵桥向拉应力,降幅可达36.3%.
[Abstract]:In view of the problem that the UHPC layer is too thin to adopt the form of conventional shear joint in the composite deck slab of orthotropic steel plate and ultra-thin ultra-high performance concrete (Ultra High Performance Concrete,UHPC) (the thickness of which is the 20mm wear layer of 35mmUHPC slab), A new type of local welded shear joint of steel mesh is proposed. The load-slip relationship curve and shear bearing capacity of welded shear-resistant parts were measured by deducing tests. The arrangement of welded shear-resistant parts was studied on the background of a Yangtze River bridge. The test results show that the failure process is brittle, the relative slip of the interface before the failure is relatively small, and the ultimate shear strength of the welded shear parts with 50mm length is 119kN. Compared with the bolt, the interface slip of the welded shear parts is smaller than that of the studs under the same load ratio, and the shear stiffness of the welded shear parts is greater than that of the bolts. The calculation results show that the stress at the bottom of the UHPC layer should be paid attention to when the steel / ultra-thin UHPC composite deck is arranged. Increasing the arrangement density of shear joint can reduce the tensile stress in the bottom of the UHPC layer and in the longitudinal bridge, and the decrease can reach 36.3%.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178177)~~
【分类号】：U443.31

【共引文献】