整体式无缝桥梁新技术初步试验研究  

Preliminary Research on the New Technologies of Integral-Abutment Bridges

作　　者：金晓勤[1] 邵旭东[1] 陈华辉[1] 林辉[1] 

机构地区：[1]湖南大学桥梁工程研究所,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2006年第4期1-5,共5页Journal of Hunan University:Natural Sciences

基　　金：高校博士点基金项目(20040532018);广东省交通厅科研基金项目(粤交科(99)40号);广东省公路管理局科研项目(粤公科(2004)667号)

摘　　要：传统的无缝桥梁搭板末端常出现路面裂缝或路面接缝。针对这个问题,在某一采用沥青混凝土铺装的中小整体式无缝桥梁,我们提出了采用斜置搭板和加筋接线路面结构等两项新措施,取消了搭板末端的路面接缝,而梁体的伸缩变形在接线路面以下被安全吸纳.有限元模型计算揭示了斜置搭板与接线路面的相互作用问题;室内小尺寸模型试验初步验证了加筋路面的受力变形机理,并探讨了加筋材料的选择问题,推荐使用土工格栅.我国第一座整体式无缝实验桥梁4年安全运营和长期监测结果均表明这种设计思路的有效和可行.The traditional integral abutment bridge with asphalt pavement has the common problems of surface cracks or expansion joints at the end of approach slabs. Two special treatments, i.e. the sloping approach slabs and reinforcing approach pavement, have been proposed to avoid these problems for short or medium integral abutment bridges, thus absorbing the bridge thermal movement. Finite element model of the approaches demonstrates the interaction between the sloping approach slabs and the approach pavement, i.e. the sloping approach slab anchored to the integral abutment will push against the pavement structure and pull away with the bridge＇s cyclic thermal movements. A small scale tension test of the reinforcing pavement shows the mechanism of its tension-deformation and a biaxial geogrids is recommended, The successful operation of the first medium test integral bridge using these new technologies in China in the past four years proves the feasibility and effectiveness of these new technologies,and the field-survey is presented.

关 键 词：整体式桥台 裂缝 斜置搭板 加筋接线路面 土工格栅 

分 类 号：U443.21[建筑科学—桥梁与隧道工程] U443.3[交通运输工程—道路与铁道工程]