钢混叠合连续梁桥提载与抗震加固技术研究

Research on Enhance Load Grade and Seismic Strengthening Technology for Steel-Concrete Composite Continuous Girder Bridge

I形截面钢混叠合连续梁桥因其特殊的结构形式和受力特点,无法采取常规的增大截面、增设预应力等加固方式,并且连续梁负弯矩区混凝土开裂问题是这类桥梁的通病,一直未能很好解决。对此,论文以哥斯达黎加32号公路Rio Chirripo大桥加固改造项目为背景,介绍了I形截面钢混叠合连续梁桥提载及抗震加固方案设计情况,论述了各方案的优劣,总结归纳了桥梁加固施工技术要点,取得了良好的加固效果。

Due to its special structural form and stress characteristics, the I-section steel composite beam bridge cannot adopt conventional reinforcement methods such as increasing the section and adding prestress. The problem of concrete cracking in the negative moment area of the continuous beam is a common problem of this type of bridge. It has not been well resolved. In this regard, based on the reinforcement and reconstruction project of the Rio Chirripo Bridge on Highway 32 in Costa Rica, the paper introduces the design of the I-section steel composite composite girder bridge and the seismic reinforcement scheme, discusses the advantages and disadvantages of various schemes, and summarizes the technical points of bridge reinforcement construction have achieved good reinforcement effect.