节段拼装双柱式墩桥梁抗震性能及设计方法研究

发布时间：2018-01-24 07:19

本文关键词： 干接缝节段拼装墩城市高架桥纤维分析模型非线性时程分析抗震性能减隔震措施性能设计方法抗震设计对策　出处：《长安大学》2017年博士论文　论文类型：学位论文

【摘要】：随着城市化进程的加快,发展高架快速路构建多元化城市交通空间,并采用标准化预制化施工已成为一种趋势。节段拼装式桥墩以其施工方法具有节能环保、质量可靠、安全快捷、对交通干扰小等优点在各种梁桥中得到了越来越广泛的应用。已有关于节段拼装式桥墩的研究多只针对墩柱单个试件的抗震性能,且实际应用工程亦多建造于低烈度区;随着节段拼装技术向高地震危险地区的发展,如何分析桥梁桥墩地震需求,如何区分干接缝拼装桥墩与整体浇筑墩抗震性能差异,如何评价节段拼装墩高架桥的抗震性能、减隔震措施应用效果,如何进行节段拼装墩高架桥的抗震设计等,是当前亟需解决的问题。因此,本文在对国内外相关文献、资料分析梳理的基础上,研究了适用于节段拼装桥墩地震需求的设计原理,采用纤维模型和非线性时程分析方法,研究了桥梁中节段拼装单墩拟延性、桥梁纵、横向地震响应和减隔震支座的设置原则、结构拟延性的适宜参数等,基于桥梁延性抗震和减隔震设计方法,形成了节段拼装墩桥梁的抗震设计方法。主要研究内容如下:(1)通过对节段拼装桥墩抗震理论研究成果的归纳分析,结合对桥梁减隔震的基本理论、材料本构关系等的深入分析,确定了采用纤维模型法模拟墩柱构件、非线性时程分析法进行桥梁体系地震响应分析的研究方法;基于Open SEES纤维模型分析方法,将干接缝拼装式桥墩数值分析结果与已有的研究试验成果进行了对比分析,验证了模拟方法的正确性,为节段拼装墩抗震性能和设计方法研究奠定了基础。(2)从单墩构件的角度,基于拟静力试验和纤维模型数值方法,研究了实桥工程节段拼装单墩构件的拟延性特性,对比分析了与相同构造的现浇钢筋混凝土单墩构件拟延性特性的异同。(3)从单墩构件的角度,针对城市高架桥预应力节段拼装墩的预应力大小、通过接缝配筋率、墩柱长细比、轴压比等因素进行了参数化研究,揭示了城市高架节段拼装墩柱的抗震特性。(4)从桥梁结构体系的角度,基于减隔震设计理念、纤维模型法、非线性时程分析方法,在纵向、横向地震作用下对比分析整孔预制箱梁城市高架桥中节段拼装墩与现浇墩墩的地震响应,研究了在不同工况下减隔震措施的减震应用效果、减隔震支座设置和参数选择原则,分析了不同地震烈度、桥梁跨数等参数对桥梁延性抗震性能的影响,得到了节段拼装墩桥梁体系中减隔震措施适应效果及减隔震措施设置原则,可为类似工程提供参考借鉴。(5)以满足桥梁结构体系地震需求为目标,基于纤维模型法、非线性时程分析方法,分别在纵向、横向地震作用下,以节段拼装墩整孔预制箱梁城市高架桥为研究对象,探讨了节段拼装墩城市高架桥设置配套减隔震措施后结构抗震适宜参数。(6)以拓展节段拼装桥墩应用范围为目的,在桥梁的节段拼装墩抗震性能、桥梁纵横向地震响应和减隔震支座的设置方法、结构抗震的适宜参数等研究成果基础上,结合现行规范的规定,形成了节段拼装墩桥梁的抗震设计对策;以节段拼装桥墩裂缝性能为指标,建立了节段拼装墩城市高架桥梁性能设计方法及设计流程,可为高震区工程应用提供技术支持。
[Abstract]:With the city to speed up the process of development, building a diversified city elevated expressway traffic space, and the use of standardized prefabricated construction has become a trend. The segmental type pier with its construction method with energy conservation and environmental protection, reliable quality, safe and fast, application of the advantages of small traffic interference has been more and more in all kinds of bridges widely. Research on segmental type pier has been more than just for a single column pier specimen seismicperformance, and practical application also built in low intensity region; with the development of assembly technology segment to the area of high seismic risk, how to bridge pier seismic demand analysis, how to distinguish the differences of dry joint assembly and pier overall pouring pier seismic performance, how to evaluate the seismic performance of precast segmental bridge pier, reducing the application effect of isolation measures, how to carry out the segmental pier viaduct bridge seismic design, when The problem to be solved. Therefore, based on the related literature at home and abroad, on the basis of data analysis, the design principle for the analysis of segmental bridge pier seismic demand, history analysis method of the fiber model and the nonlinear time of bridge segmental quasi single pier ductility, bridge longitudinal, setting the principle of lateral seismic response and isolation bearing structure, the ductility of the quasi optimal parameters, ductility based seismic design method of seismic mitigation and isolation, forming a seismic design method of assembly bridge pier section. The main contents are as follows: (1) based on the segmental pier seismic theory research summary and analysis of the basic theory the combination of seismic isolation and reduction, in-depth analysis of the material constitutive relations, determine the simulation component of pier by fiber model method, the nonlinear time history analysis method to carry on the research analysis of the seismic response of bridge system SEES; Open analysis method based on fiber model, the numerical analysis of joint assembled piers with the existing test results were compared and analyzed, to verify the correctness of the simulation method, for segmental pier seismic performance and design method of the foundation. (2) from the single pier component angle, pseudo static experimental and numerical methods based on fiber model, quasi ductile characteristics of the bridge engineering precast segmental single pier component, compared with the same structure of cast-in-place reinforced concrete single pier ductility characteristics of quasi component differences. (3) from the angle of single pier structure, the size of city viaduct for prestressed prestressed segment the assembly of the pier, the pier joint reinforcement ratio, slenderness ratio, axial compression ratio and other factors on the parametric study, reveals the city viaduct segmental pier seismic characteristics. (4) from the bridge structure system perspective, based on seismic isolation The design concept, fiber model method, nonlinear time history analysis method, comparative analysis in the longitudinal, lateral seismic section of hole precast box girder viaduct in the city assembled piers and cast-in-place pier seismic response effect of seismic application of seismic isolation measures in different conditions, the principle of setting and parameter reduction isolation, analysis of different seismic intensity, the number of bridge span influence parameters on the seismic performance of bridge ductility, the seismic isolation measures of segmental bridge pier system adapt to the effect and principle of setting isolation measures, it can provide a reference for the similar project. (5) to meet the bridge structure seismic needs as the goal. The fiber model method based on nonlinear time history analysis method, respectively, in the longitudinal and transverse earthquake, the entire precasting box segmental city viaduct pier girder as the research object, discusses the segmental City High Pier Bridge set supporting structure's seismic isolation measures appropriate parameters. (6) to expand the scope of application of segmental bridge column for the purpose of the segmental bridge pier seismic performance of bridges, vertical and horizontal setting method of seismic response and seismic isolation bearing, the suitable parameters on the basis of research results, combined with the provisions of the current specification the formation of the seismic design of bridge pier segment erection countermeasures; the segmental pier crack performance index established elevated bridge performance design method and design process of assembling City Pier segment for high seismic zone engineering should be used to provide technical support.

【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：U442.55

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