预应力混凝土连续梁桥最终体系转换工序倒置影响分析

在采用悬臂施工的预应力混凝土连续梁桥的最终体系转换阶段,现场人员容易忽略拆除临时支座再张拉剩余预应力索的两关键工况的先后顺序。文中以某常见的变截面预应力混凝土连续箱梁桥为例,采取有限元软件MIDAS CIVIL分别计算了工序倒置后对成桥线形、应力分布和预应力损失的影响,结果表明对应力分布影响较大,易造成局部拉裂,应引起高度重视。

Influence Analysis of Final Process Inversion When System Transformation of Prestressed Continuous Concrete Beam

When the cantilever construction was adopted by the prestressed continuous concrete beam,the sequence of two key processes of removing temporary support and tensing remanent prestressed cable used to be ignored.This paper uses a common prestressed concrete continuous box girder bridge as an example,uses the finite element software MIDAS CIVIL to calculate the impact of bridges linear,stress distribution and prestress loss after the inversion process.The result shows that it has a great impact on stress distribution,it causes local crack easily.The problem should be attached great importance.