包神铁路混凝土桥梁横向刚度加固设计方案

Strengthening Design Schemes for Transverse Rigidity of Concrete Bridges on Baotou-Shenmu Railway

在分析包神铁路混凝土桥梁检定报告、按现行规范检算和动力计算结果的基础上,得出桥梁横向刚度不足的结论,制定了6种不同类型T形梁桥的加固方案,即:对短跨低高度混凝土T梁采用增设钢筋混凝土横隔板、对16 m以上混凝土T梁采用增设预应力混凝土横隔梁的方案。通过加固前后动力计算结果对比,证明该方案加固效果显著,加固后桥梁符合现行规范要求。

On the basis of analysis of the inspection reports, the checking calculation according to the present specifications and the calculation of the dynamic load of concrete bridges on Baotu-Shenmu Railway, it was concluded that the transverse rigidity of the bridges was not sufficient. The strengthening design schemes for the six kinds of different T-girder bridges were formulated, i. e., for the short span and shallow T-girders of the bridges, the girders would be strengthened by way of adding reinforced concrete diaphragm plates while for the T-girders with span length longer than 16 m, they would be strengthened by way of adding prestressed concrete diaphragm beams. The comparison of the calculation of the dynamic load of the bridges before and after they were strengthened prove that the strengthening effect according to the schemes is significant and the bridges after they were strengthened can meet the requirements in the present specifications.