预应力混凝土连续曲线箱梁桥模型试验  

Model Test of PC Continuous Curved Box Girder

作　　者：方淑君[1] 戴公连[1] 曾庆元[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《湘潭大学自然科学学报》2006年第4期115-120,共6页Natural Science Journal of Xiangtan University

基　　金：湖南省自然科学基金资助项目(03JJY3085)

摘　　要：曲线箱梁桥结构往往采用独柱单点支承方式.国内外有不少独柱单点支承曲线箱梁桥发生整体移位现象,或者发生支座脱空现象,更有甚者发生箱梁倾覆现象,单点支承体系和支座设置不当是其主要原因.通过比例缩尺为1∶5的三跨连续曲线箱梁桥的模型试验,探讨了该结构在预应力和使用荷载作用下的挠度、支座反力及径向位移.试验梁的计算跨度为6 m+9 m+6 m.中间支座为独柱单点支承,梁端为双支座支承,梁体曲线半径为120 m.试验梁细部尺寸根据几何相似原则及施工需要进行设计,采用支架现浇施工.试验为立交桥的安全设计提供理论依据,也为弯梁理论研究提供实践基础.Prestressed concrete continuous curved girder with unipivot support has been widely used in China. Many curved box girders with unipivot support was run - off from the original position ~ or took part null of supporting seat, even sometimes occurred overturning of the box girder in the last few years in China or in other foreign countries. The primary reason is the single - point supporting system and the wrong choice of location way of bearing. So a model test with ratio of 1：5 has been carried out on the 3 - span continuous curved box girder. In this paper, the flexibility, radical displacement and supporting force are investigated under tension prestressing and service loading. Its span of the model is 6 ＋ 9 ＋ 6 = 21 m. And the middle supporting brace employs unipivot support, and the either sides employs double-supporting system. Radius of the curved girder is 120 m. Model detail sizes are designed by the likelihood ratio method and the construction requirement. And the model is formed with support setting. The test provides a theoretical basis for designing in safety of the fly - over bridge as well as a practical basis for the theoretic study of curved girder.

关 键 词：模型试验 连续曲线箱梁 挠度 支座反力 

分 类 号：U446[建筑科学—桥梁与隧道工程]