弹性阶段体外预应力钢束二次效应研究  

The Second-Effect Analysis of External Tendons in Elastic Stage

作　　者：张锋[1] 徐栋[1] 席广恒[2] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]辽宁省交通勘测设计院,沈阳110005

出　　处：《结构工程师》2006年第6期19-24,共6页Structural Engineers

基　　金：交通部西部交通建设项目(项目编号:2004ZB07)

摘　　要：结合交通部2004年度西部交通建设项目《体外预应力桥梁设计施工技术研究》,利用体外预应力混凝土桥梁结构弹性阶段非线性分析程序,对体外预应力混凝土桥梁的二次效应进行了分析。分析中选择等截面预应力混凝土简支梁、等截面连续梁和大跨径变截面连续刚构桥等代表性桥梁结构形式,以结构跨径、跨高比、转向块间距、体外预应力钢束布置形式等为主要研究参数,研究体外预应力钢束二次效应的影响程度。计算了工程实例的二次效应。研究表明在弹性阶段体外预应力混凝土桥梁的二次效应均较小,在设计中可不予考虑。By using a nonlinear computer program for externally prestressed concrete bridges, the secondeffect of external tendons in externally prestressed concrete beam bridges was analyzed. We analyzed three typical kinds of bridges： simply supported bridges, continuous bridges with constant section, continuous frame bridges with variable sections. The influence of span, span depth ratio, the spacing between deviators, the layout of external tendons was investigated. The second-effect in a practical bridge was also calculated at last. The results show that the second-effect of external tendons in elastic stage is so small that it can be neglected.

关 键 词：体外预应力 二次效应 非线性 

分 类 号：TU394[建筑科学—结构工程]