摘要
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。
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 CML 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.
出处
《广东土木与建筑》
2013年第2期30-32,共3页
Guangdong Architecture Civil Engineering
关键词
连续梁
体系转换
悬臂施工
应力分布
continuous beam
system transformation
cantilever construction
stress distribution
