体外预应力索加固预应力混凝土连续箱梁桥方案比较  

SCHEME COMPARATION OF STRENGTHENING CONTINUOUS PRESTRESSED CONCRETE BOX GIRDER BRIDGE BY EXTERNAL PRESTRESSED CABLE

作　　者：周建民 何余良[2] 吴旭东[2] 高越青[2] 项贻强 

机构地区：[1]柯桥区政府投资项目建设管理中心,浙江绍兴312000 [2]绍兴文理学院,浙江绍兴312000 [3]浙江大学,杭州310058

出　　处：《工业建筑》2017年第3期182-187,共6页Industrial Construction

摘　　要：以某预应力混凝土连续箱梁桥为背景,建立有限元模型,采用空间分析方法分别计算了成桥恒载效应(包括预应力)、温度效应、车道荷载效应以及组合效应,然后分析其对箱梁开裂的影响。基于分析结果,针对背景工程已有的裂缝和存在的问题,提出了体外预应力加固设计方案,并通过空间有限元模型分析了加固后桥梁的受力特性,并与加固前比较,说明此加固方案效果显著。A finite element model was set up according to the background of a continuous prestressed concrete box girder bridge. The effects of dead load,temperature,lane load and associated ones were calculated by spatial analysis method,and then their influence on the crack of the box girder was analyzed. The reinforcement design scheme of external prestressed cable was proposed based on the analysis result. The mechanical characteristics of the reinforced girder were analyzed,which showed that the reinforcement method was good.

关 键 词：连续箱梁桥 裂缝 有限元模型 体外预应力 加固 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]