發(fā)布時間：2018-04-11 23:19

  本文選題：非規(guī)則梁橋 + 地震反應　； 參考：《長安大學》2014年碩士論文

【摘要】：中小跨徑非規(guī)則梁橋是一種較為常見的橋型。目前針對中小跨徑非規(guī)則梁橋的抗震設(shè)計理論尚不完善。在設(shè)計時，若不考慮此類結(jié)構(gòu)的特殊性，可能會給結(jié)構(gòu)帶來極大的安全隱患。本文在分析前人研究成果的基礎(chǔ)上，針對中小跨徑非規(guī)則連續(xù)梁橋的地震反應特點進行研究，主要研究內(nèi)容如下： （1）以國內(nèi)外已有研究成果為基礎(chǔ)，探討橋梁結(jié)構(gòu)振動及地震反應分析方法特點，為本文后續(xù)研究工作提供理論支撐；結(jié)合有限元模型討論橋梁各構(gòu)件的地震分析模擬方法；通過中國場地類型分類方法與美國NEHRP規(guī)范中場地分類方法對比分析，確定從太平洋地震工程中心的強震數(shù)據(jù)庫選取地震波的方法。 （2）對不同支座布置與橋墩截面構(gòu)造組合下的橋梁結(jié)構(gòu)地震反應進行研究�；�于橋梁結(jié)構(gòu)振動分析方法，通過有限元數(shù)值分析，研究不同支座布置與橋墩截面構(gòu)造組合對橋梁結(jié)構(gòu)動力特性的影響；基于反應譜法和時程分析方法，對不同支座布置與橋墩截面構(gòu)造組合下的橋梁結(jié)構(gòu)彈性地震反應（墩底剪力、彎矩、軸力、主梁彎矩）及彈塑性地震反應（墩頂位移、主梁位移、塑性鉸區(qū)的轉(zhuǎn)角）進行計算分析，并結(jié)合現(xiàn)有橋梁抗震規(guī)范對支座受力及變形進行分析；綜合研究各方案的動力特性、彈性地震反應、彈塑性地震反應、支座受力及變形等方面，，最后獲得支座與橋墩的最佳組合形式。 （3）采用時程分析法，選取不同支座布置形式（高阻尼橡膠支座、抗震盆座）、不同場地條件（Ⅰ、Ⅱ類場地）、不同地震波加速度幅值（0.1g、0.2g、0.3g、0.4g）以及不同橋墩高度，對中小跨徑連續(xù)梁橋的地震反應進行有限元數(shù)值分析，通過對比分析橋墩和主梁的內(nèi)力及位移，獲得中小跨徑非規(guī)則梁橋的地震反應規(guī)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

本文編號：1738114