钢 砼混合梁桥行车平顺性研究-桥梁与隧道工程专业论文.docxVIP

摘 要 i 随着国民经济和桥梁建设的发展，钢-砼混合结构越来越多的出现在大跨桥梁中， 在结构性能得到发挥的同时出现了行车不平顺问题，其主要是因为在混合梁的钢-砼结 合段处，刚度过渡突变的量值过大，出现了主梁竖向变形凹凸不顺滑，进而导致车辆过 桥时将对桥梁产生较大的冲击力，车辆所产生的动力效应会激起较大的车桥振动，从而 影响行车的平顺性。因此，进行钢-砼混合梁桥行车平顺性的研究具有重要的实际意义。 本文针对混合梁钢-砼结合段的整体设计问题，系统地介绍了钢-砼结合段位置的合 理设置、钢-砼结合段的构造形式、钢-砼结合段结构受力特性的对比及钢-砼结合段的 组成及其作用，并依托渭河特大桥的钢-砼结合段，对渭河特大桥钢-砼结合段的刚度优 化和行车平顺性进行了深入研究。为了实现钢-砼结合段各梁段刚度的平稳过渡、主梁 竖向变形连续光滑的目的，建立了十种不同形式的刚度配置方案，并对各种刚度方案进 行了静、动力特性对比分析，从而选出刚度过渡均顺、变形值满足要求、位移曲线较顺 滑、应力最小、振感不明显、行车平顺性和舒适性最好的最优方案。最后，本文给出了 渭河特大桥钢-砼结合段刚度平稳过渡的建议，其研究可为同类桥梁设计提供参考。 关键词：混合梁； 钢-砼结合段； 钢箱梁； 混凝土箱梁； 刚度过渡； 行车平顺 性； 汽车荷载 Abstract ii As the development of the national economy and the bridge construction, the steel- concrete mixed structure is more and more appearing in the Long-span bridge, the problem of uneven driving appeared at the same time that the structure performance can be fulfilled. The reasons of the driving unevenly are as follows: the stiffness had the large quantity of mutation in the steel-concrete joint section of the mixed beam owing to the improper design, so that vertical deformation of the primary beam was not smooth, which would further lead to that HYPERLINK /vehicle  vehicles produced larger impact force and further aroused greater vibration of vehicle-bridge. Therefore, the stiffness of the smooth transition in the steel-concrete joint section of the mixed beam based on the driving comfort is of important and practical significance to study. Aiming at the overall design of the steel-concrete joint section of the mixed beam , this paper introduces the reasonable setting of the steel-concrete joint sections position, structural form of the steel-concrete joint section ,stress characteristics of the steel-concrete joint section and composition and function of the steel-concrete joint section, and relying on the steel-concrete joint section of the Weihe Bridge, focuses on the stiffness optimizations research in the steel-concrete joint section of the Weihe Bridge. In order to fulfill the purpose on the smo