预应力混凝土—钢槽梁结合梁梁桥构造研究

发布时间：2018-04-04 07:45

本文选题：钢槽梁结合梁　切入点：滑移效应　出处：《武汉理工大学》2014年硕士论文

【摘要】：预应力混凝土-钢槽梁结合梁是在混凝土梁和钢梁的基础上，经过结构的不断优化下提出并在实际工程中初次得以应用的一种新的组合结构形式，该形式解决了钢筋混凝土箱梁自重过大，相对预应力钢箱梁体系，其简化了钢材的焊接，节省了造价；尤其是钢槽梁可与桥面形成结合梁，解决了钢箱梁桥面易破损的难题。国内外部分桥梁中已经得到应用。该桥梁形式符合大跨径桥梁的发展方向，适应国际先进技术发展趋势，极具应用前景。因此，有必要对预应力混凝土-钢槽梁结合梁进行研究。本文结合实际工程项目：G318国道长桥大桥以及二七长江大桥汉口侧引桥6×90m钢槽梁结合梁桥，，对预应力混凝土-钢槽梁结合梁桥的构造展开研究，主要研究了以下几个方面：首先，横向分析：预应力混凝土钢槽梁结合梁桥的构造既是混合梁桥又是结合梁桥，为了进一步研究这种新型桥梁的构造，分别对混合梁和结合梁两种结构进行研究。纵向分析：通过系统的对比了三种体系结构：钢箱梁体系、钢筋混凝土箱梁体系、预应力混凝土-钢槽梁结合梁桥，得出预应力混凝土钢槽梁结合梁体系的优势之所在。此外，系统的介绍了钢-混凝土组合梁桥设计和计算，分别从钢梁、钢筋混凝土桥面板和剪力键三部分进行。其次，结合318国道长桥工程实例，利用有限元软件MIDAS对预应力钢混组合连续箱梁建立模型，参照二七长江大桥汉口侧引桥的钢槽梁结合梁截面形式对预应力混凝土钢槽梁桥桥进行设计，建立出对比的钢槽梁结合梁有限元模型。通过对计算数据加以分析，得出预应力混凝土钢槽梁结合梁桥受力特点及其优良性能。最后，通过分别建立考虑滑移和不考虑滑移效应的midas钢槽梁结合梁模型，通过对比模型计算结果。研究了滑移效应对预应力混凝土钢槽梁结合梁桥力学行为的影响。结果表明，滑移值随着弯矩值大小变化而变化；考虑滑移效应的结构挠度增大，尤其是跨中区域；滑移效应使得钢槽梁上缘压应力以及下缘拉应力变大。因此在在设计的过程需要保障钢槽梁和混凝土桥面板之间的粘结强度。
[Abstract]:The composite beam of prestressed concrete and steel slot beam is a new type of composite structure, which is put forward by the continuous optimization of the structure on the basis of concrete beam and steel beam and is applied in practical engineering for the first time.This form solves the problem that the reinforced concrete box girder has too much self-weight and relative prestressing steel box girder system, which simplifies the welding of steel and saves the cost, especially the steel slot beam can form a combined beam with the bridge deck, and solves the difficult problem that the steel box girder bridge deck is easy to be damaged.Some bridges at home and abroad have been applied.The bridge form accords with the development direction of the long span bridge, adapts to the international advanced technology development trend, and has the extremely application prospect.Therefore, it is necessary to study the prestressed concrete-steel slot beam.First of all, transverse analysis: the structure of prestressed concrete steel groove beam combined beam bridge is not only a hybrid beam bridge but also a combined beam bridge. In order to further study the structure of this new bridge, the hybrid beam and the composite beam structure are studied separately.Longitudinal analysis: through systematic comparison of three kinds of system structures: steel box girder system, reinforced concrete box girder system, prestressed concrete-steel slot beam combined beam bridge, the advantages of prestressed concrete steel groove beam composite beam system are obtained.In addition, the design and calculation of steel-concrete composite beam bridge are introduced systematically, including steel beam, reinforced concrete deck slab and shear key.Secondly, the model of prestressed steel-concrete composite continuous box girder is established by using finite element software MIDAS with the example of 318 national highway long bridge project.According to the section form of steel groove beam combined beam of Hankou side approach bridge of Erqi Yangtze River Bridge, the prestressed concrete steel groove beam bridge is designed, and the comparative finite element model of steel slot beam composite beam is established.Based on the analysis of the calculated data, the stress characteristics and excellent performance of prestressed concrete steel slot beam combined beam bridge are obtained.Finally, the combined beam model of midas steel slot beam with and without slip effect is established, and the results are compared.The influence of slip effect on the mechanical behavior of prestressed concrete steel groove girder bridge is studied.The results show that the slip value varies with the bending moment value, the deflection of the structure with the slip effect increases, especially in the mid-span region, and the slip effect increases the compressive stress at the upper edge and the tensile stress at the lower edge of the steel slot beam.Therefore, the bond strength between steel slot beam and concrete deck slab should be guaranteed in the design process.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.5

【参考文献】