波形钢腹板导梁局部承压的加强构造与试验  

EXPERIMENT AND STRENGTHEN CONFIGURATION ON CORRUGATED STEEL-WEB-NOSE GIRDER UNDER LOCAL COMPRESSION

作　　者：苏庆田[1] 林航[1] 杜霄[1] 曾明根 

机构地区：[1]同济大学土木工程学院桥梁工程系,上海200092

出　　处：《工程力学》2017年第B06期78-83,共6页Engineering Mechanics

摘　　要：直接使用组合梁中的波形腹板钢梁作为顶推导梁,在局部压力作用下钢梁的承载力较弱,而且钢梁与桥梁支座之间存在间隙,为此提出提高波形腹板钢导梁局部承压的加强构造。为进一步研究波形钢腹板导梁在承受局部压力作用时的受力特性,设计制作3组缩尺模型试验,测试了不同加强构造下导梁在局部压力作用下破坏形态和极限承载力。研究表明:试件破坏形态均为支座范围内波形腹板局部压溃,设置钢靴能够明显提高波形腹板导梁的局部承压性能和结构延性,特别是设置箱形钢靴的效果要优于工字形钢靴,二者分别使导梁极限承载力提高了58%和12%。While directly using the corrugated steel-web beam of a composite girder as an incremental launching nose girder, the bearing capacity of a steel beam under local pressure is weak, and there is a gap between a steel beam and bridge supports. So strengthening configurations to improve the local bearing performance of a corrugated steel-web guide-beam is proposed. In order to further analyze the stress characteristics of corrugated steel-web guide-beam under local compression, 3 groups of scale model test were designed and tested to measure the failure model and ultimate bearing capacity of the guide-beam with different strengthening structures. The results show that all failure modes of the specimens are local buckling of corrugated web within the bearing rage and steel boots significantly improve the local bearing performance of corrugated web guide-beam as well as structural ductility. Box type boot functions better than 1-shape boot, and they respectively increase the ultimate bearing capacity of a guide beam by 58% and 12%.

关 键 词：波形钢腹板导梁 局部承压 缩尺模型试验 钢靴 极限承载力 

分 类 号：TU317[建筑科学—结构工程]