简支梁桥体外预应力筋受活载作用的应力变化  

Stress Variation Research of External Tendons under Live Load in Simple Beam Bridges

作　　者：徐栋[1] 刘超[1] 金卫兵[2] 吴国民[2] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]江苏省交通规划设计院,江苏南京210005

出　　处：《同济大学学报（自然科学版）》2004年第3期291-295,共5页Journal of Tongji University:Natural Science

摘　　要：利用研发的体外预应力混凝土桥梁结构弹性阶段非线性分析专用程序 ,对几种典型跨径体外预应力混凝土简支梁桥的体外预应力钢束在汽车活载作用下的应力变化进行分析 ,研究了结构跨高比、体外预应力钢束与结构的粘结关系、转向块间距等参数对计算结果的影响 .同时也与相同条件下的传统体内预应力结构的预应力钢束的应力变化幅度进行比较 .By using a computer program especially developed for ex ternally prestressed concrete bridges,the stress variation of external tendons u nder live load in several typical spans of an externally prestressed concrete si mple beam bridge was analyzed.The influences of span depth ratio,the different b ondings between external tendons and the bridge structure,the spacing between de viators to the calculation results were discussed.The comparison was also made t o the result of similar traditional internally prestressed concrete bridges.The research is a part of a research program for evaluation on fatigue of external p restressing tendon systems.

关 键 词：桥梁 体外预应力 预应力混凝土桥梁 疲劳 应力变幅 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]