曲线梁桥不同约束形式下的受力性能及其适用性分析  

Analysis of Load Bearing Capacity and Applicability of Curved Girder Bridge under Different Restrictions

作　　者：李翊策[1] 鞠三 徐秀丽[1] 李雪红[1] 李枝军[1] 朱俊朋[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009 [2]中交第二公路勘察设计院有限公司,湖北武汉430056

出　　处：《世界桥梁》2012年第6期43-46,72,共5页World Bridges

基　　金：江苏省交通科学研究计划项目(2010Y13)

摘　　要：为确定混凝土曲线梁桥不同固定约束形式下的受力性能及与墩高相适应的合理的固定约束形式,以某混凝土曲线梁桥为例,采用有限元法分析墩梁现浇固结和盆式固定支座2种边界形式对不同墩高曲线梁桥受力性能的影响。计算结果表明:与盆式固定支座形式相比,墩梁现浇固结使主梁受扭更加合理,且能很好地控制主梁径向位移;为了使桥墩受力更加合理,对于墩高较高的曲线梁桥(该研究为墩高8m以上)固定边界宜采用墩梁现浇固结,对于墩高较矮的曲线梁桥固定边界宜采用固定支座;为优化主梁扭矩和减小桥墩负担,建议在使用固定支座时设置径向外侧的预偏心。To identify the load bearing capacity of concrete curved girder bridge under various fixed restrictions and the rational type of fixed restraint suitable to the height of piers, against the background of a concrete curved girder bridge, the finite element method was used to analyze the effects of two boundary conditions of pier-girder cast-in-situ fixation and fixed pot bearing on the load bearing capacity of curved girder bridge with piers of various heights. The results of the cal- culation indicate that the pier-girder cast-in-situ fixation, compared with fixed pot bearings, givesrise to more rational torsion of the main girder and well controls the radial displacement of the main girder; in order to make the load bearing capacity of the bridge pier more rational, it is better to choose the fixed boundary of pier-girder cast-in-situ fixation for the curved girder bridge with high-rise piers （the height of pier for this study is above 8 m）, and the fixed boundary of fixed bearing to the curved girder bridge with low piers; to optimize the torsion of the main girder and abate the burden of piers, the lateral pre-eccentricity in the radial direction is suggested to be set when the fixed bearings are used.

关 键 词：曲线梁桥 固定边界形式 墩高 内力 有限元法 

分 类 号：U448.42[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]