大跨混合梁连续刚构桥设计要点研究

Research on Design Key Points of Continuous Rigid Frame Bridge withLong-Span Composite Beam

为解决大跨混合梁刚构桥总体设计的合理性、静动力作用下结构的安全性、钢-混结合段的传力性能等关键技术问题,采用大型有限元软件对主跨300 m混合梁刚构桥进行静动力计算分析。结果表明:在静动力荷载作用下,各项力学性能满足规范要求;结合段采用有格室的后承压板形式,刚度过渡良好,在荷载作用下有一定的承载能力安全储备,各项结果表明该桥总体设计合理。

In order to solve the key technical problems such as the rationality of the overall design of the long-span hybrid beam rigid frame bridge,the safety of the structure under static and dynamic action,and the force transmission performance of the steel-concrete composite section,the large finite element software was used to calculate and analyze the composite beam rigid frame bridge with a 300-meter.main span.The results show that the mechanical properties meet the requirements of the code under the action of static and dynamic load.The combined section adopts the form of latticed rear pressure plate with good stiffness transition and certain bearing capacity under the action of load.The overall design of the bridge is reasonable.