高速铁路PC槽形连续梁结构设计与分析研究

Structural Design and Analysis of PC Trough Continuous Beam for High-speed Railway

摘要:

漳汕高铁韩江特大桥桥梁与路基交界处需跨越市政道路，因此主梁采用了对于桥下净空具有优势的32 m+48 m+32 m预应力混凝土槽型连续梁。介绍了槽形梁断面设计、构造细节，对比了单梁模型、梁格法模型、环框模型、板单元模型、实体模型分析结果。结果表明：单梁模型能较好地反映结构在自重作用下的受力和变形；环框+梁格模型无法进行横向设计分析；设计荷载作用下，槽形梁能满足列车行驶的安全性和平稳性要求；横梁处应力集中较为明显，宜采用实体模型进行分析。

Abstract:

The Hanjiang Bridge of Zhangshan High-speed Railway crosses the municipal road near the junction of the bridge and the roadbed. Therefore， the main beam adopts 32 m+48 m+32 m prestressed concrete trough continuous beam, which has advantages for the headroom under the bridge. The section design and structural details of the trough beam are introduced. The results of the single beam model, grillage model, ring frame model, plate element model and solid model are compared. The results show that the single beam model can better reflect the stress and deformation of the structure under the action of self-weight. The ring frame model + grillage model cannot be used for transverse design analysis. Under the design load, the trough beam can meet the running safety and stability requirements of the train. The stress concentration at the cross beam is more obvious, and the use of solid model is suitable for analysis.