(100+180+100)m大跨连续刚构桥设计

Design of(100+180+100)m Large Span Continuous Rigid Frame Bridge

大跨连续刚构桥采用墩梁固结的结构形式,取消了大吨位支座,节省了造价,方便施工,且结构动力性能优异,是大跨度桥梁中十分有竞争力的桥梁类型,在山区跨越深沟大壑或河流时广泛采用。某跨越黄河峡谷的铁路桥梁主桥采用预应力混凝土连续刚构,孔跨布置为(100+180+100) m。主梁采用单箱单室预应力混凝土箱梁,主墩采用薄壁空心桥墩,主墩基础采用明挖满灌基础。采用有限元分析法对主桥进行了整体静力、动力分析计算,并进行了车桥耦合动力分析。结果表明,该桥在施工和运营阶段各项指标均满足相关规范要求,结构安全可靠,具有良好的列车行车安全性和平稳性,动力性能符合要求。可为同类桥梁结构提供参考。

Thanks to the adoption of the consolidated structmre forpier and beam, large tonnage bearing is cancelled for large-span continuous rigid frame bridge, cost is also saved, and a convenient construction could be got. This bridge type is a verey competitive bridge style, and it is verey popular when bridge designer counters deep groove. A main railway bridge across the Yellow River valley adopts prestressed concrete continuous rigid frame type, and its span arrangement is （100 ＋ 180 ＋ 100）m. The upper main girder adopts a single concrete box girder with a single ventricular, the lower main pier adopts thin wall voided pier, and its abutments use open-cut foundation. Static and dynamic analyses and calculations are carried out for the main bridge by finite element analysis, and vehicle-bridge interaction analysis is also conducted. The results indicate that the bridge is safe and reliable, and everey index meet the relevant requirements of codes. It has sound security and riding quality, and the dynamic performances meet requirements. The design of the bridge could provide references for similar structmres.