摘要
针对小曲线半径普通钢筋混凝土桥,为减少钢筋用量且方便施工,以一既有小曲线半径等截面普通钢筋混凝土桥为研究对象,采用缓粘结预应力技术对其进行改造设计。参考相关桥梁设计规范,按A类部分预应力混凝土构件要求对所需预应力筋面积进行初步估算,并在箱梁腹板内按照弯矩图形状进行缓粘结预应力筋布筋设计。在此基础上,调用有限元软件MIDAS Civil中的PSC设计验算模块,对改造设计后的缓粘结预应力连续箱梁进行承载能力极限状态与正常使用极限状态验算。结果表明,改造后的桥梁状态良好,满足规范各项要求,改造后普通钢筋用量减少近30 t。
Aiming at the continuous beam bridge with small curve radius,an existing ordinary reinforced concrete bridge with a small curve radius and equal cross-section is taken as the research object,and the retard-bonded prestressed technology is adopted to carry out the reconstruction design to reduce the amount of reinforcement and facilitate the construction.First,referring to the relevant bridge design specifications,the required prestressed reinforcement area is preliminarily estimated according to the requirements of class A partially prestressed concrete members,and the retard-bonded prestressed reinforcement is arranged in the web of the box girder according to the shape of the bending moment diagram.On this basis,the PSC design checking module of the finite element software MIDAS Civil is called to check the bearing capacity limit state and serviceability limit state of the modified retard-bonded prestressed continuous box girder.The checking results show that the reconstructed bridge is in good condition,meets the specification requirements,and the amount of ordinary reinforcement is reduced by nearly 30 t.
作者
王广为
WANG Guangwei(China Railway Construction Group Co.Ltd.,Beijing 100040,China)
出处
《铁道建筑技术》
2024年第12期46-50,共5页
Railway Construction Technology
基金
中铁建设集团有限公司科技研发计划项目(LX21-36C)。
关键词
缓粘结预应力
小曲线半径桥
等截面梁
连续梁桥
retard-bonded prestress
small curve radius bridge
constant section beam
continuous beam bridge
