无伸缩缝桥梁荷载横向分布系数研究  

Research on Transverse Load Distribution Factors for Jointless Bridges

作　　者：彭大文[1] 陈朝慰[2] 林志平[2] 李秀芳[2] 

机构地区：[1]上海应用技术学院土木建筑与安全工程学院,上海200235 [2]福州大学土木建筑工程学院,福建福州350002

出　　处：《公路交通科技》2007年第9期51-56,共6页Journal of Highway and Transportation Research and Development

基　　金：上海教委重点资助项目(040A01);上海自然科学基金资助项目(05ZR14113)

摘　　要：考虑土体-结构的相互作用,应用通用程序ANSYS建立无伸缩缝桥梁有限元模型,研究了不同荷载形式对跨中截面荷载横向分布的影响规律,分析了荷载横向分布系数沿桥跨的变化情况;与相应的简支梁荷载横向分布系数进行比较,并进行主要影响参数的分析,为无伸缩缝桥梁荷载横向分布系数的简化计算提供理论依据。编制了可供工程设计参考的荷载横向分布系数的实用表格,并进行实例验证。研究结果表明:对于无伸缩缝桥梁,可采用单个集中荷载的加载形式,通过挠度的横向分布影响线来研究荷载横向分布规律,且可以取跨中横向分布系数m值作为全桥的计算值;无伸缩缝桥梁的边梁荷载横向分布系数比相应的简支梁小,但两者内梁的荷载横向分布系数非常接近;实例证明实用表格是准确可行的。The FEM of jointless bridge are established with the program ANSYS considering the soil-strueture interaction.The pattern of different loads influencing on the transverse load distribution of the middle seetion and the ehange of transverse load distribution factors along longitudinal direetion are studied. Different transverse load distribution factors are eompared with the simple beam bridge, and the influence of structure parameters is analyzed. The practieal tables ealeulating transverse load distribution faetors are provided and validated by the example. The researching results indieate that, transverse load distribution factors earl be studied by the transverse distribution influence line of the defleetion with the loading format of the single eoneentrated load adopted for jointless bridge, the transverse load distribution factors of the middle seetion earl be adopted as the one of the all span, that the transverse load distribution factors of the side beam of joinfless bridge is less than the one of the simple beam bridge but the factors of middle of two bridges are very near, and the practical tables are eorreet for ealeulating transverse load distribution factors.

关 键 词：桥梁工程 横向分布系数 有限元法 无伸缩缝桥梁 整体式桥台 实用表格 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]