腊芒大桥体外预应力加固分析与设计  

Analysis and Design of Lamang Bridge Strengthened with External Prestressing

作　　者：张柳煜[1] 陈偕民[1] 邬晓光[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《筑路机械与施工机械化》2009年第10期55-57,共3页Road Machinery & Construction Mechanization

摘　　要：通过有限元模型仿真分析,研究了大跨径连续刚构桥设计荷载等级发生变化时的受力特性,发现箱梁抗裂性不符合规范要求。根据计算分析结果和连续刚构桥的特点,提出了体外预应力加固方案,并对加固后的结构进行了计算分析。结果表明采用体外预应力进行加固,可以明显改善其承载能力和抗裂性能。The mechanical characteristics of long-span continual rigid frame bridge under different design value of load are studied by finite element model. The simulation analysis＇ results show that the box girder＇s cracking resistance performance can not satisfy the requirement of the design code. According to the analysis＂ results and the continual rigid frame bridge＇s characteristics, it put forward the strengthening method with external prestressing, and analyzed the strengthened structure. The results indicate that the strengthening method with external prestressing can obviously increase the bearing capacity and cracking resistance performance of the bridge structure.

关 键 词：连续刚构桥 有限元 仿真分析 体外预应力 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]