CFRP筋体外加固铁路预应力混凝土简支梁桥设计及试验研究  

THE DESIGN AND TEST STUDY ON PRESTRESSED RAILWAY CONCRET BEAM BRIDGE STRENGTHENED BY EXTERNALLY DRAPED CFRP TENDONS

作　　者：徐礼华[1] 许锋[1] 曾浩[1] 秦文科 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]武汉武大巨成加固实业有限公司,武汉430072

出　　处：《工程力学》2013年第2期89-95,111,共8页Engineering Mechanics

基　　金：国家高技术研究发展计划项目(2009AA11Z102-2);中央高校基金科研业务费专项资金项目(210275569)

摘　　要：采用自主研发的CFRP筋体外预应力加固桥梁锚具装置(包括锚固装置和张拉装置),对铁路预应力混凝土简支梁桥进行加固设计和现场试验。针对CFRP筋体外预应力加固特点,计算预应力损失和CFRP筋配筋面积,验算加固桥梁的反拱、正截面强度、抗裂性、抗剪性以及挠度等;在此基础上,对大秦铁路线某16m预应力混凝土简支梁桥进行了现场加固试验。结果表明:该文提出的加固方法适用于实际铁路桥梁加固,加固后符合现行铁路相关规范和混凝土结构加固设计规范要求,且桥梁的受力性能得到明显改善。Regarding to the reinforcement of the prestressed railway concrete beam bridge, an anchor device developed by the authors is adopted and applied in both the design and field test. The device is composed of anchors and tensioning devices, which is designed to strengthen the bridge by externally draped CFRP tendons. According to the characteristics of CFRP tendon prestressed reinforcement, prestress losses and CFPR reinforcement area are calculated, while the antiarch, normal section strength, crack resistance, shear resistance and deflection are checked, etc. Then, filed test was carried on a 16-m long prestressed railway concrete beam bridge of Daqin railway. The results show that the reinforcement method is suitable for practical railway bridge reinforcement, while the requirements of current railway codes and design codes for strengthening concrete structures are fulfilled and the mechanical behavior is improved significantly after reinforcement.

关 键 词：预应力混凝土简支梁桥 CFRP筋 体外预应力加固 预应力损失 加固设计 现场试验 

分 类 号：U24[交通运输工程—道路与铁道工程]