渭河大桥钢-混结合段设计

为减轻自重,增大桥梁跨越能力,渭河大桥主桥第一联采用钢-混混合连续梁桥方案。第一联90m边跨为钢-混混合梁,其中混凝土段长36m,钢-混结合段长2.5m,钢箱梁段长51.18m。采用ANSYS 10.0建立钢-混结合段模型,进行受力性能分析。分析结果表明:全桥及钢-混结合段的破坏荷载较高,结合段的安全储备很大;钢-混结合段在最不利荷载作用下应力均较小,材料在弹性范围内;通过钢-混结合段的设计,能保证结构刚度的平稳过渡和内力平顺传递。

Design of Steel-Concrete Joint Section of Weihe River Bridge

To reduce the deadweight and increase the crossing ability of bridge,the first continuous unit of the main bridge of Weihe River Bridge is designed as steel-concrete hybrid continuous beam structure.The 90 m side span of the first continuous unit is of steel-concrete hybrid beam structure,of which the lengths of the concrete section,the steel-concrete joint section and the steel box section are 36 m,2.5 m and 51.18 m,respectively.The ANSYS 10.0 was adopted to establish the model of the steel-concrete joint section to carry out stress analysis.The results of the analysis indicate that the failure load of the full bridge and the steel-concrete joint section is high,the joint section owns great safety margin;the stress of the steel-concrete joint section is little under the action of the most unfavorable load and the materials are within elastic range;and through the design of steel-concrete joint section,the smooth transition of stiffness and the smooth transmission of internal force of the structure can be guaranteed.