中小跨径非规则梁桥地震性能研究

发布时间：2018-04-11 23:19

  本文选题：非规则梁桥 + 地震反应　； 参考：《长安大学》2014年硕士论文

【摘要】：中小跨径非规则梁桥是一种较为常见的桥型。目前针对中小跨径非规则梁桥的抗震设计理论尚不完善。在设计时，若不考虑此类结构的特殊性，可能会给结构带来极大的安全隐患。本文在分析前人研究成果的基础上，针对中小跨径非规则连续梁桥的地震反应特点进行研究，主要研究内容如下： （1）以国内外已有研究成果为基础，探讨桥梁结构振动及地震反应分析方法特点，为本文后续研究工作提供理论支撑；结合有限元模型讨论桥梁各构件的地震分析模拟方法；通过中国场地类型分类方法与美国NEHRP规范中场地分类方法对比分析，确定从太平洋地震工程中心的强震数据库选取地震波的方法。 （2）对不同支座布置与桥墩截面构造组合下的桥梁结构地震反应进行研究。基于桥梁结构振动分析方法，通过有限元数值分析，研究不同支座布置与桥墩截面构造组合对桥梁结构动力特性的影响；基于反应谱法和时程分析方法，对不同支座布置与桥墩截面构造组合下的桥梁结构弹性地震反应（墩底剪力、弯矩、轴力、主梁弯矩）及弹塑性地震反应（墩顶位移、主梁位移、塑性铰区的转角）进行计算分析，并结合现有桥梁抗震规范对支座受力及变形进行分析；综合研究各方案的动力特性、弹性地震反应、弹塑性地震反应、支座受力及变形等方面，，最后获得支座与桥墩的最佳组合形式。 （3）采用时程分析法，选取不同支座布置形式（高阻尼橡胶支座、抗震盆座）、不同场地条件（Ⅰ、Ⅱ类场地）、不同地震波加速度幅值（0.1g、0.2g、0.3g、0.4g）以及不同桥墩高度，对中小跨径连续梁桥的地震反应进行有限元数值分析，通过对比分析桥墩和主梁的内力及位移，获得中小跨径非规则梁桥的地震反应规律。
[Abstract]:Irregular beam bridge with medium and small span is a common bridge type.At present, the seismic design theory of small and medium span irregular beam bridges is not perfect.If the particularity of this kind of structure is not taken into account in the design, it may bring great hidden danger to the structure.Based on the analysis of previous research results, the characteristics of seismic response of small and medium span irregular continuous beam bridges are studied in this paper. The main contents are as follows:1) based on the existing research results at home and abroad, the characteristics of vibration and seismic response analysis methods of bridge structures are discussed, which provides theoretical support for the subsequent research work in this paper, and discusses the seismic analysis and simulation methods of each component of bridges with finite element model.The method of selecting seismic waves from the strong earthquake database of the Pacific Seismic Engineering Center is determined by comparing and analyzing the classification method of site types in China and in the NEHRP Code of the United States of America.2) the seismic response of bridge structure under the combination of different support arrangement and pier section structure is studied.Based on the vibration analysis method of bridge structure and finite element numerical analysis, the influence of different support arrangement and pier cross-section structure combination on the dynamic characteristics of bridge structure is studied, and the response spectrum method and time-history analysis method are used to analyze the dynamic characteristics of bridge structure.The elastic seismic response (shear force at pier bottom, moment, axial force, bending moment of main beam) and elastic-plastic seismic response (displacement of pier top, displacement of main beam) of bridge structure under different support arrangement and cross section structure of pier are studied.The dynamic characteristics, elastic seismic response, elastic-plastic seismic response of each scheme are studied synthetically, and the stress and deformation of the bearing are analyzed in combination with the existing seismic code of the bridge, the angle of the plastic hinge region is calculated and analyzed, and the elastic seismic response and the elastoplastic seismic response of each scheme are comprehensively studied.Finally, the best combination form of bearing and pier is obtained in the aspects of bearing force and deformation.By using time history analysis, different bearing arrangement forms (high damping rubber bearing, earthquake resistant basin base, different site conditions (type 鈪

本文编号：1738114