混凝土箱梁大悬臂模型桥极限状态试验研究  

Non Linear Analysis of Transverse Long Cantilever for Continuous Box Girder on Model Bridge

作　　者：张岗[1] 谢功元[1,2] 周勇军[1] 高香龙 

机构地区：[1]长安大学桥梁与隧道陕西省重点试验室,西安710064 [2]湖北省交通基本建设工程质量监督站,武汉440030 [3]陕西交通建设集团,西安710064

出　　处：《武汉理工大学学报（交通科学与工程版）》2008年第5期830-833,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家西部交通建设科技项目(批准号:200531881215)资助

摘　　要：以某实桥联混凝土箱梁横向大悬臂为原型,根据相似原理,建立模型非线性准则,设计制作了1∶10缩尺模型.研究了混凝土箱梁大悬臂模型桥的极限状态受力性能和变形、破坏形态、破坏机制、裂缝宽度及发展规律.研究表明:集中荷载作用在跨中,模型桥承载力达到极限状态时,荷载作用处变形相对其他部位较大;集中荷载作用在大悬臂横梁两端,横梁上缘顶板顺桥向开裂长度过大,裂缝过宽而导致模型桥极限承载能力下降;由于混凝土箱梁大悬臂模型桥宽跨比较大,双向受力明显,最终表现为局部承载.Limit state tests are conducted on a 1 ： 10 scaled model of transverse long cantilever concrete box girder in Xi＇an to investigate the failure mode,failure mechanism and shape,deflection, variation of crack propagation such as crack width and length. Meanwhile, model nonlinear criterion is presented. Experimental results indicate that while concentrated loads acting on mid-span approach to limit state the deflection near the load location is bigger than other＇s, crack is distributed ovally as the loads center of a circle, the structure fails when the crack on concrete at web plate is cut through; Concentrating loads acting on the transverse sides of long cantilever beam will lead to cracks length and width on the upper plate big, which it cause the limited bearing capacity low; because of the ratio of width to length is large, hi-direction stress is obvious, which shown as the partial bearing capacity finally.

关 键 词：桥梁工程 相似原理 混凝土箱梁 缩尺模型 极限状态 

分 类 号：U448.14[建筑科学—桥梁与隧道工程] TU378.2[交通运输工程—道路与铁道工程]