连续刚架-拱桥三角刚架模型试验研究  

Model Test Study of Triangle Frame of a Continuous Rigid-Framed Arch Bridge

作　　者：罗甲生 赵灿晖[2] 古松[2] 李乔[2] 

机构地区：[1]广州新光快速路有限公司,广东广州510100 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《桥梁建设》2008年第1期26-29,共4页Bridge Construction

基　　金：建设部科技计划项目(05-K5-15)

摘　　要：三角刚架是连续刚架拱桥最为重要的结构之一,通过广州新光大桥1∶10缩尺模型试验,研究三角刚架在施工及运营荷载作用下的应力发展和分布规律、抗裂性及承载能力。试验结果表明三角刚架在施工阶段以斜腿顶部拉应力控制设计,运营阶段以斜腿根部压应力控制设计,在正常使用荷载作用下三角刚架具有足够的抗裂安全性和承载力储备。The triangle frame is one of the most important structures of a continuous rigidframed arch bridge. On the basis of the 1 ：10 scale-down model tests for Xinguang Bridge in Guangzhou, this paper makes a study of the stress development, stress distribution laws, cracking resistance performance and carrying capacity of the triangle frame of the bridge subjected to construction load and service load. The results of the tests reveal that at the construction stage, the tensile stress in the tops of the slant legs of the triangle frame governs the design while at the service stage, the compressive stress in the base of the legs governs the design. Under the condition of normal service load, the triangle frame has sufficient safety of cracking resistance and reservation of carrying capacity.

关 键 词：拱桥 连续刚架拱桥 三角刚架 模型试验 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U446[交通运输工程—道路与铁道工程]