能量法求均布载荷作用下梁桥体外力筋应力增量  

To Calculate the Stress Increment of Externally Prestressed Tendon for Girder Bridges using Energy Method under Uniform Loadings

作　　者：刘东燕[1] 朱正伟[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《沈阳建筑大学学报（自然科学版）》2006年第3期402-405,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：重庆市自然科学基金(102075120040022)

摘　　要：目的探讨均布载荷作用下简支、连续梁桥体外力筋应力增量的简便计算方法.方法运用小变形原理和能量法来建立计算模型和方法,并通过算例与力法、有限元法等方法进行对比验证.结果建立了简支、连续梁桥在正常使用载荷阶段体外力筋应力增量的计算方法,分析了三角函数和多项式函数作为变形曲线的应用.结论建立的体外力筋应力增量计算方法是合理的、可靠的.在计算中,简支梁桥用4次方多项式函数即可满足精度要求,连续梁桥则不宜采用多项式作为变形函数.This paper presents formulas derivation of externally prestressed tendon stress increment using energy method for simply supported, continuous girder bridges under uniform loadings. The derivation applies two deformation curves, i. e. trigonometric function and polynomial function. The accuracy of the proposed formulas is verified by comparison with the results of case study and those from other calculation methods, such as Force Method, Finite Element Method. Furthermore, the trigonometric function is feasible to both simply supported and continuous girder bridges. The polynomial function is not appropriate to continuous girder bridges, and the quartic can satisfy the precision to those simply supported.

关 键 词：能量法 体外预应力 梁桥 体外力筋 应力增量 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]