本文關(guān)鍵詞： 拱橋 Pushover分析 鋼管混凝土 抗震性能 高階振型　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：鋼管混凝土拱橋的抗震性能一直備受關(guān)注，本文以基于結(jié)構(gòu)性能的抗震設(shè)計(jì)理念為應(yīng)用背景，對(duì)鋼管混凝土拱橋進(jìn)行研究。目前基于結(jié)構(gòu)性能的抗震設(shè)計(jì)理念分析主要采用兩種方法：非線性時(shí)程分析和靜力彈塑性分析(Pushover)。時(shí)程分析雖然是較精細(xì)分析方法，但對(duì)地震動(dòng)記錄非常敏感且計(jì)算量大、耗時(shí)多；然而，Pushover方法因?yàn)楹?jiǎn)單有效而成為基于性能設(shè)計(jì)的熱點(diǎn)課題，該方法可以避免非線性時(shí)程分析的復(fù)雜性和不確定性。本文嘗試將Pushover分析方法應(yīng)用于鋼管混凝土拱橋的抗震性能評(píng)估，對(duì)促進(jìn)基于性能的橋梁結(jié)構(gòu)設(shè)計(jì)和評(píng)估的研究與實(shí)踐，有著重要的理論價(jià)值和現(xiàn)實(shí)意義。 本文以實(shí)際工程潮白河大橋?yàn)檠芯繉?duì)象，首先建立了該鋼管混凝土拱橋的空間有限元分析模型，并對(duì)其進(jìn)行了模態(tài)分析，獲得了前60階模態(tài)參數(shù)，為進(jìn)一步的Pushover分析準(zhǔn)備數(shù)據(jù)。 之后，，研究分析了拱橋Pushover分析方法的基本原理、基本假定、影響因素以及傳統(tǒng)的Pushover分析方法。與傳統(tǒng)方法不同，本文中直接獲得等效單自由度體系equivalent-single-degree-of-freedom(ESDOF)的恢復(fù)力Q與位移x，直接建立ESDOF的能力曲線，從而既實(shí)現(xiàn)了三維加載模式，又符合理論推導(dǎo)。 其次，基于拱橋Pushover分析方法理論，選取按振型Φ加載的方式加載，并考慮高階振型的影響，按橫向振動(dòng)有效質(zhì)量系數(shù)和達(dá)到90%以上為原則選取振型向量Φ1和Φ5加載，直接獲得相應(yīng)的等效單自由度體系ESDOF1和ESDOF5。對(duì)原結(jié)構(gòu)度多自由度體系muti-degree-of-freedom(MDOF)和ESDOF1、ESDOF5分別進(jìn)行了天津地震動(dòng)、EL Centro地震動(dòng)和阪神地震動(dòng)這三條地震動(dòng)下的彈塑性時(shí)程分析，將MDOF分別與考慮多振型組合的ESDOF、以及僅考慮振型1的ESDOF的地震響應(yīng)峰值進(jìn)行對(duì)比分析。結(jié)果表明考慮多振型組合的Pushover分析方法與原結(jié)構(gòu)MDOF響應(yīng)峰值吻合的較好，誤差都在20%以下；然而不考慮多振型組合的Pushover分析方法與原結(jié)構(gòu)MDOF吻合的很差，誤差都在20%以上，不滿足實(shí)際工程精度要求，從而驗(yàn)證了基于多振型組合的Pushover分析的鋼管混凝土拱橋抗震性能評(píng)估方法的可行性，且精度滿足實(shí)際工程需求。 最后，將Pushover分析方法和增量動(dòng)力分析IDA結(jié)合起來(lái)，嘗試用多個(gè)等效單自由度體系的恢復(fù)力模型近似代替原結(jié)構(gòu)進(jìn)行IDA分析，這樣不僅計(jì)算代價(jià)小，而且結(jié)果吻合較好，誤差都在20%以?xún)?nèi)，將考慮多振型組合的Pushover分析方法與IDA方法結(jié)合在一起，從而實(shí)現(xiàn)了對(duì)鋼管混凝土拱橋全面的抗震性能評(píng)估，對(duì)基于結(jié)構(gòu)性能的橋梁設(shè)計(jì)和評(píng)估的研究與實(shí)踐，有一定的參考意義。
[Abstract]:The seismic performance of CFST arch bridge has been a concern, based on the seismic design of structure based on performance as the application background, research on CFST arch bridge. The seismic design analysis of structural performance mainly uses two methods based on nonlinear time history analysis and pushover analysis (Pushover). Although the time history analysis more sophisticated analysis methods, but the record is very sensitive and large amount of calculation, time-consuming; however, because the Pushover method is simple and effective and has become a hot topic in performance-based design, this method can avoid the complexity of nonlinear time history analysis and uncertainty. This paper will try to evaluate the seismic performance of Pushover analysis method is applied to concrete filled steel tubular arch bridge and to promote the research and practice of bridge structure design and performance evaluation based on, has important theoretical value and practical significance.
Taking the actual engineering of the Chao Bai River Bridge as the research object, the spatial finite element analysis model of the CFST arch bridge is built first, and the modal analysis is carried out. The first 60 order modal parameters are obtained, which will prepare data for further Pushover analysis.
After the research and analysis of the basic principle, the basic assumption of arch bridge Pushover analysis method, the influence factors and the traditional Pushover method. Different from traditional methods, direct access to the equivalent single degree of freedom system in equivalent-single-degree-of-freedom (ESDOF) Q restoring force and displacement x, direct build capacity curve of ESDOF, so as to implement the three-dimensional loading model, and are consistent with the theoretical results.
Secondly, the Pushover analysis method based on the theory of arch bridge, select the loading mode according to the diameter of loading, and considering the effects of higher modes according to the transverse vibration of the effective mass coefficient and more than 90% for the principle of choosing the mode vector Phi 1 and phi 5 loading, direct access to the corresponding equivalent single degree of freedom system of ESDOF1 and ESDOF5. muti-degree-of-freedom the original structure of multi degree of freedom system (MDOF) and ESDOF1, ESDOF5 were carried out in Tianjin earthquake, EL Centro earthquake and the Kobe earthquake processanalysis the three earthquake bombs, MDOF respectively and considering the multi modal combination of ESDOF and ESDOF mode 1 only consider the comparative analysis of earthquake response peak. The results show that considering the Pushover analysis method of multi mode combined with the original structure of MDOF response peak in good agreement, errors are below 20%; however, without considering the analysis of multi modal combination Pushover The method is very consistent with the original structure MDOF, and the error is over 20%, which does not meet the requirements of actual engineering accuracy. It verifies the feasibility of the seismic performance evaluation method of CFST Arch Bridge Based on multi mode combination Pushover analysis, and the accuracy meets the actual engineering needs.
Finally, the Pushover analysis method and incremental dynamic analysis IDA together, try to use a single degree of freedom system of multiple equivalent restoring force model instead of the original structure was analyzed by IDA, which not only has lower computational cost, and the results are in good agreement, errors are less than 20%, the test method of Pushover analysis and multiple mode combination the IDA method together, so as to realize the evaluation of seismic performance of CFST arch bridge comprehensively, research and practice of the performance of bridge structure design and evaluation based on a certain reference value.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.22;U442.55

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