高速铁路大跨度钢箱叠合拱桥理论研究与实桥试验

发布时间：2018-11-03 21:21

【摘要】：随着桥梁设计理论的进步、施工技术的提高,人们对于桥梁设计的要求,不再仅仅是从安全与适用的角度,而是从桥梁美学的角度提出更高的期望,叠合拱桥因跨越能力强、刚度大、造型美观、桥下净空较大等特点,在高速铁路桥梁得以应用。叠合拱桥是一种将组成主拱肋的上、下拱肋部分分离,且拱脚分设在不同墩台上或同一墩台上的拱桥体系。本文在总结国内外大跨度钢拱桥发展与研究成果的基础上,以哈大高速铁路新开河桥为工程背景,对高速铁路钢箱叠合拱桥结构的设计、实桥试验以及吊杆锈蚀损伤的结构安全评估等关键问题进行了系统的研究。首先,对新型的叠合拱桥结构体系的梁拱协作机理与简化实用计算进行了研究。通过对均布荷载作用下叠合拱桥结构连接杆与吊杆的有限元分析结果进行归纳分析,做出吊杆内力大小相等、连接杆内力大小相等的假定,将吊杆与连接杆内力假定为膜张力,将叠合拱桥结构分为梁拱组合体、吊杆与连接杆三种构件,基于变形协调方程,求解出了均布荷载作用下叠合拱桥结构体系的吊杆与连接杆均布膜张力以及拱肋与主梁挠度的简化公式,并对公式进行误差分析与修正。其次,针对高速铁路钢箱叠合拱桥结构体系进行了全面的研究。以哈大新开河桥为工程背景,采用有限元数值方法系统地研究了高速铁路钢箱叠合拱桥结构动静力力学行为与稳定性能。分析了矢跨比、拱肋内倾角、横撑布置形式、吊杆布置形式与拱肋系梁刚度比等结构设计参数对钢箱叠合拱桥结构力学行为的影响。考虑设计中对于梁端转角的验算,基于改善的响应面法,对高速铁路钢箱叠合拱桥梁端转角进行了可靠性评估。再次,基于哈大高速铁路新开河桥的实桥试验,对高速铁路钢箱叠合拱桥施工阶段进行计算分析,结合倒拆分析法,分析吊杆的施工阶段的内力,保证最终的成桥状态满足设计要求。由于对主桥的全面有效的实桥测试,不仅保证施工的安全,更得到大量很有价值的数据,为进一步分析和研究创造了有利条件。最后,计算分析了吊杆损伤对高速铁路钢箱叠合拱桥结构动静力力学行为与稳定性能的影响。基于区间概率可靠度分析理论,建立锈蚀损伤钢构件失效模式的分析模型,计算分析该构件各失效模式的区间失效概率,证明了区间概率在钢结构的锈蚀损伤安全评估中的适用性。基于吊杆锈蚀损伤的模型,计算分析了新开河桥在运营阶段的结构安全性能。通过本文的研究,对高速铁路钢箱叠合拱桥结构体系、结构形式、简化计算、实桥试验、吊杆损伤的结构安全评估等方面进行了较为系统的分析研究,为叠合拱桥的设计、施工与运营阶段结构的安全评估提供依据和参考。
[Abstract]:With the development of bridge design theory and the improvement of construction technology, the requirement of bridge design is not only from the angle of safety and applicability, but also from the point of view of bridge aesthetics. Large stiffness, beautiful shape, large clearance under the bridge and so on, which can be used in high speed railway bridge. Superimposed arch bridge is a kind of arch bridge system in which the upper and lower arch ribs are separated and the arch feet are divided on different piers or the same pier abutment. On the basis of summing up the development and research results of large-span steel arch bridge at home and abroad, taking Xinkai River Bridge of Harbin and Dalian High Speed Railway as the engineering background, this paper designs the structure of superimposed arch bridge of steel box in high-speed railway. Some key problems, such as bridge test and structural safety assessment of Derrick corrosion damage, are systematically studied. Firstly, the beam-arch cooperation mechanism and simplified practical calculation of a new type of composite arch bridge system are studied. Through the induction and analysis of the finite element analysis results of the connecting rods and suspenders of the superimposed arch bridges under uniform load, the assumption that the internal force of the suspenders is equal and the internal forces of the connecting rods are equal, the internal forces of the suspenders and the connecting rods are assumed to be the membrane tension. The structure of superimposed arch bridge is divided into three kinds of components: beam and arch combination, suspender and connecting rod, and based on the deformation coordination equation, A simplified formula for the uniform membrane tension of the suspenders and the connecting rods and the deflection of the arch rib and the main beam under uniform load is obtained, and the error analysis and correction of the formula are carried out. Secondly, the structure system of high-speed railway steel box composite arch bridge is studied. Taking the Hada Xinkai River Bridge as the engineering background, the static and dynamic mechanical behavior and stability of the high speed railway steel box composite arch bridge are systematically studied by using the finite element numerical method. The influence of structural design parameters such as rise-span ratio, inclination angle of arch rib, arrangement form of transverse braces, arrangement form of suspension rod and stiffness ratio of arch rib beam on structural mechanical behavior of steel box superimposed arch bridge is analyzed. Based on the improved response surface method, the reliability of the end angle of the steel box composite arch bridge in high-speed railway is evaluated based on the checking calculation of the beam end rotation angle in the design. Thirdly, based on the actual bridge test of Xinkaihe Bridge of Hada High Speed Railway, this paper calculates and analyzes the construction stage of the steel box superimposed arch bridge in high-speed railway, and analyzes the internal force of the suspender in the construction stage by combining the inverted disassembly analysis method. Ensure the final completion of the bridge to meet the design requirements. Because of the comprehensive and effective test of the main bridge, not only the safety of the construction is guaranteed, but also a large number of valuable data are obtained, which creates favorable conditions for further analysis and research. Finally, the influence of suspension damage on dynamic and dynamic behavior and stability of steel box composite arch bridge in high speed railway is calculated and analyzed. Based on the theory of interval probabilistic reliability analysis, an analytical model of failure mode of corroded steel member is established, and the interval failure probability of each failure mode of the member is calculated and analyzed. The applicability of interval probability in the safety assessment of corrosion damage of steel structures is proved. Based on the rusting damage model of suspension rod, the structural safety performance of Xinkai River Bridge in operation stage is calculated and analyzed. Through the research of this paper, the structural system, structure form, simplified calculation, real bridge test and structural safety assessment of suspension damage of high speed railway steel box superimposed arch bridge are analyzed and studied systematically, so as to design the superimposed arch bridge. The construction and operation stage structure safety evaluation provides the basis and the reference.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U448.22

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