波形钢腹板PC连续刚构桥静动力特性分析及抗震研究
发布时间：2018-11-15 18:55
【摘要】：作为新型的钢-混复合结构,波形钢腹板PC组合箱梁桥完美的诠释了钢混组合结构的优良性能,腹板的波折形状与普通混凝土箱梁结构腹板相比,桥梁上部结构重量明显减小,也降低了下部结构的承重[1]。同时还具有较高的预应力效率、较短的施工周期和美观的外形等优势,在法国等欧洲国家发展尤其迅速,在日本也得到很好的应用与研究。目前,该类型的桥梁具有很好的实用性和发展前景,它的应用逐步由简支等截面箱梁向变截面大跨度连续钢构体系发展,结构更加美观,承载力也逐步加强[2]。现有的研究主要是分析该种结构的波形腹板在桥梁的抗弯能力、抗剪切能力及抗扭能力等方面的贡献,波形钢腹板桥梁的有限元分析大多针对于其静力和动力特性的分析,对其抗震性能分析的研究还不多[3]。本文以兰州市小砂沟大桥为工程背景,详细分析了该桥在静力荷载试验的情况下,试验测试结果与有限元计算结果,并通过有限元法评估了该桥梁的工作状况、安全性能及抗震性能,评判其是否符合桥梁运行和维护的设计标准和要求,为后续同类桥梁的建设提供参考依据[4]。本文主要研究的内容包括:(1)描述了波纹钢腹板桥梁的力学性能,并总结了波形钢腹板PC箱梁桥在抗弯性能、抗剪切性能以及抗扭转性能等方面的理论结果。(2)通过小砂沟大桥的静力荷载试验,得出大量桥梁关键部位相关的实验数据,并将其与有限元软件得出的结果进行对比分析,重点分析了小砂沟大桥主桥考核断面的挠度和应力分布,结果表明:小砂沟大桥主桥的变形在规范规定的小变形范围内,最大竖向位移与桥梁跨度比都均小于规范规定的1/600,位移校验系数满足一般不大于1的要求;控制截面实测应力值变化规律和理论分析基本吻合。(3)利用有限元软件对小砂沟大桥进行动力特性分析、模态分析和抗震分析,获得其自振频率、振型以及地震动效应。采用反应谱法和动态时程分析法对该桥在E1地震作用下的地震响应结果进行分析。其中,采用规范加速度反应谱法的输入桥谱曲线,分别就桥梁的顺桥向、横桥向及竖向作用下得到了该桥在位移及内力地震响应的一般规律;动态时程分析法则采用El-Centro波、Taft波以及由规范反应谱拟合而成的人工波对该桥进行时程反应分析,通过比较两种分析的结果进而得出该桥抗震设计的合理性。
[Abstract]:As a new type of steel-concrete composite structure, PC composite box girder bridge with corrugated steel webs perfectly interprets the excellent performance of steel-concrete composite structure. The corrugated shape of web plate is obviously smaller than that of ordinary concrete box girder structure web plate, and the weight of the superstructure of the bridge is obviously reduced. The bearing capacity of the substructure is also reduced [1]. At the same time, it has the advantages of high prestressing efficiency, short construction period and beautiful appearance, etc. It has developed rapidly in France and other European countries, and has also been applied and studied well in Japan. At present, this type of bridge has good practicability and development prospect. Its application is gradually developed from simply supported box girder with equal section to continuous steel system with variable section and large span. The structure is more beautiful and the bearing capacity is gradually strengthened [2]. The existing research is mainly to analyze the contribution of the corrugated web of this kind of structure to the bridge's bending, shear and torsion resistance, etc. The finite element analysis of the corrugated steel web bridge is mostly aimed at the static and dynamic analysis of the bridge. There are few studies on seismic performance analysis. Taking Xiaoshagou Bridge in Lanzhou City as the engineering background, the test results and the finite element calculation results of the bridge under static load test are analyzed in detail in this paper, and the working condition of the bridge is evaluated by the finite element method. Safety performance and seismic performance, judging whether they meet the design standards and requirements of bridge operation and maintenance, and providing a reference basis for the subsequent construction of similar bridges [4]. The main contents of this paper are as follows: (1) the mechanical properties of corrugated steel web bridge are described, and the bending behavior of corrugated steel web PC box girder bridge is summarized. Theoretical results of shear and torsion resistance. (2) through the static load test of Xiaoshagou Bridge, a large number of experimental data about the key parts of the bridge are obtained. The results obtained by finite element software are compared and analyzed, and the deflection and stress distribution of the checking section of the main bridge of Xiaoshagou Bridge are analyzed. The results show that the deformation of the main bridge of Xiaoshagou Bridge is within the range of small deformation specified in the code. The ratio of the maximum vertical displacement to the span of the bridge is less than 1 / 600 as stipulated in the code, and the displacement check coefficient meets the general requirement of less than 1. The variation law of the measured stress values of the control section is basically consistent with the theoretical analysis. (3) the dynamic characteristics modal analysis and seismic analysis of Xiaoshagou Bridge are carried out by using finite element software. The natural vibration frequency mode shape and ground motion effect of the bridge are obtained. Response spectrum method and dynamic time history analysis were used to analyze the seismic response of the bridge under E1 earthquake. Among them, the input bridge spectrum curve of the standard acceleration response spectrum method is used to obtain the general law of the bridge's displacement and internal force seismic response under the action of the bridge's forward, transverse and vertical direction, respectively. The dynamic time-history analysis method uses El-Centro wave, Taft wave and artificial wave fitting from the normative response spectrum to analyze the time-history response of the bridge. By comparing the results of the two kinds of analysis, the rationality of seismic design of the bridge is obtained.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.23
本文编号：2334154
[Abstract]:As a new type of steel-concrete composite structure, PC composite box girder bridge with corrugated steel webs perfectly interprets the excellent performance of steel-concrete composite structure. The corrugated shape of web plate is obviously smaller than that of ordinary concrete box girder structure web plate, and the weight of the superstructure of the bridge is obviously reduced. The bearing capacity of the substructure is also reduced [1]. At the same time, it has the advantages of high prestressing efficiency, short construction period and beautiful appearance, etc. It has developed rapidly in France and other European countries, and has also been applied and studied well in Japan. At present, this type of bridge has good practicability and development prospect. Its application is gradually developed from simply supported box girder with equal section to continuous steel system with variable section and large span. The structure is more beautiful and the bearing capacity is gradually strengthened [2]. The existing research is mainly to analyze the contribution of the corrugated web of this kind of structure to the bridge's bending, shear and torsion resistance, etc. The finite element analysis of the corrugated steel web bridge is mostly aimed at the static and dynamic analysis of the bridge. There are few studies on seismic performance analysis. Taking Xiaoshagou Bridge in Lanzhou City as the engineering background, the test results and the finite element calculation results of the bridge under static load test are analyzed in detail in this paper, and the working condition of the bridge is evaluated by the finite element method. Safety performance and seismic performance, judging whether they meet the design standards and requirements of bridge operation and maintenance, and providing a reference basis for the subsequent construction of similar bridges [4]. The main contents of this paper are as follows: (1) the mechanical properties of corrugated steel web bridge are described, and the bending behavior of corrugated steel web PC box girder bridge is summarized. Theoretical results of shear and torsion resistance. (2) through the static load test of Xiaoshagou Bridge, a large number of experimental data about the key parts of the bridge are obtained. The results obtained by finite element software are compared and analyzed, and the deflection and stress distribution of the checking section of the main bridge of Xiaoshagou Bridge are analyzed. The results show that the deformation of the main bridge of Xiaoshagou Bridge is within the range of small deformation specified in the code. The ratio of the maximum vertical displacement to the span of the bridge is less than 1 / 600 as stipulated in the code, and the displacement check coefficient meets the general requirement of less than 1. The variation law of the measured stress values of the control section is basically consistent with the theoretical analysis. (3) the dynamic characteristics modal analysis and seismic analysis of Xiaoshagou Bridge are carried out by using finite element software. The natural vibration frequency mode shape and ground motion effect of the bridge are obtained. Response spectrum method and dynamic time history analysis were used to analyze the seismic response of the bridge under E1 earthquake. Among them, the input bridge spectrum curve of the standard acceleration response spectrum method is used to obtain the general law of the bridge's displacement and internal force seismic response under the action of the bridge's forward, transverse and vertical direction, respectively. The dynamic time-history analysis method uses El-Centro wave, Taft wave and artificial wave fitting from the normative response spectrum to analyze the time-history response of the bridge. By comparing the results of the two kinds of analysis, the rationality of seismic design of the bridge is obtained.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.23
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