發(fā)布時(shí)間：2018-05-07 08:48

  本文選題：城市高架橋 + 基于性能的地震工程學(xué)�。� 參考：《合肥工業(yè)大學(xué)》2014年碩士論文

【摘要】：地震作用會(huì)導(dǎo)致橋梁結(jié)構(gòu)的易損性及其破壞的嚴(yán)重后果，現(xiàn)役的大量橋梁，有一部分還是根據(jù)舊的橋梁抗震設(shè)計(jì)規(guī)范進(jìn)行設(shè)計(jì)，在抗震設(shè)計(jì)方法和抗震構(gòu)造措施等方面都存在著一定的不足，迫切需要進(jìn)行抗震性能評(píng)價(jià)，并根據(jù)評(píng)價(jià)結(jié)果進(jìn)行不同程度的抗震加固。同時(shí)，城市高架橋具有多跨、曲線匝道多、高低墩不齊等特點(diǎn)，使得橋梁的抗震評(píng)估更為復(fù)雜。歐美日等發(fā)達(dá)國(guó)家的結(jié)構(gòu)抗震設(shè)計(jì)規(guī)范已經(jīng)全面轉(zhuǎn)向基于概率的抗震設(shè)計(jì)方法，其中應(yīng)用最為廣泛的就是基于性能的地震工程學(xué)理論，是未來結(jié)構(gòu)抗震設(shè)計(jì)的發(fā)展方向。 合肥市處于地震帶上，隨著城市交通基礎(chǔ)建設(shè)的發(fā)展，城市高架橋的地震安全性評(píng)定日益嚴(yán)峻。本文將以全概率理論為基礎(chǔ)、基于性能的地震工程學(xué)理論，進(jìn)行合肥市城市高架橋的抗震評(píng)估。根據(jù)工程場(chǎng)地地震危險(xiǎn)性分析，選擇合理的地震波，進(jìn)行非線性動(dòng)力時(shí)程分析；對(duì)不同地震危險(xiǎn)性水平下的特定工程需求參數(shù)（EDP）進(jìn)行預(yù)計(jì)，并建立起相應(yīng)的概率地震需求模型和EDP危險(xiǎn)性曲線。對(duì)算例橋梁的破壞狀態(tài)進(jìn)行了詳細(xì)的量化定義，通過基于概率的能力需求比法進(jìn)行了概率地震破壞分析，得到了各主要構(gòu)件的地震易損性曲線，充分顯示了基于概率的城市高架橋抗震性能評(píng)估方法的優(yōu)越性。 論文的主要工作包括： 1.詳細(xì)介紹了基于概率的抗震性能評(píng)估框架（PBEE），并給出了具體實(shí)施步驟。 2.討論了概率地震危險(xiǎn)性分析（PSHA）的計(jì)算過程，通過PSHA方法，獲得了合肥市包河大道工程場(chǎng)地在四種超越概率水平下的目標(biāo)譜和地震危險(xiǎn)性模型。在此基礎(chǔ)上，，選擇了合理地震波作為輸入地面運(yùn)動(dòng)，為下一步概率地震需求分析打下基礎(chǔ)。 3.采用所選擇的四組不同超越概率的地震波，以合肥市包河大道某橋?yàn)閷?duì)象，進(jìn)行非線性動(dòng)力時(shí)程分析，獲得橋梁在不同強(qiáng)度地震作用下的地震響應(yīng)。采用“Stripe”方法建立橋梁的地震需求模型（PSDM）和地震需求參數(shù)（EDP）概率危險(xiǎn)性曲線。 4.對(duì)算例橋梁的橋墩、支座和落梁等破壞狀態(tài)進(jìn)行了詳細(xì)的量化定義，并根據(jù)概率地震需求分析的計(jì)算結(jié)果，進(jìn)行了概率地震破壞分析，得到了各主要構(gòu)件的地震易損性曲線。
[Abstract]:Earthquake will lead to the vulnerability of bridge structure and the serious consequences of damage. A large number of existing bridges are still designed according to the old seismic design code. There are some shortcomings in seismic design methods and seismic structural measures. It is urgent to evaluate the seismic performance and carry out seismic reinforcement in different degrees according to the evaluation results. At the same time, the urban viaduct has many characteristics, such as multi-span, curve ramps and uneven high and low piers, which makes the seismic evaluation of the bridge more complex. The codes for seismic design of structures in developed countries, such as Europe, America and Japan, have turned to probabilistic seismic design methods. The most widely used seismic engineering theory is performance-based seismic engineering theory, which is the development direction of seismic design of structures in the future. Hefei is located on the seismic belt. With the development of urban traffic infrastructure, the seismic safety assessment of urban viaducts is becoming more and more serious. Based on the theory of full probability and the theory of seismic engineering, the seismic evaluation of Hefei city viaduct is carried out. According to seismic hazard analysis of engineering site, reasonable seismic waves are selected to carry out nonlinear dynamic time-history analysis, and the parameters of specific engineering demand under different seismic hazard levels are predicted. The corresponding probabilistic seismic demand model and EDP hazard curve are established. In this paper, the failure state of bridge is defined in detail, and the probability seismic failure analysis is carried out by means of the probability-based capacity requirement ratio method, and the seismic vulnerability curves of the main components are obtained. The superiority of the probabilistic method for evaluating the seismic performance of urban viaducts is fully demonstrated. The main work of the thesis includes: 1. The probabilistic seismic performance evaluation framework is introduced in detail, and the concrete implementation steps are given. 2. The calculation process of probabilistic seismic hazard analysis (PSHAA) is discussed. By using PSHA method, the target spectrum and seismic hazard model of Baohe Avenue project site in Hefei under four levels of transcendental probability are obtained. On this basis, the reasonable seismic wave is selected as the input ground motion, which lays the foundation for the next probabilistic seismic demand analysis. 3. Using four groups of seismic waves with different transcendental probabilities, the nonlinear dynamic time-history analysis of a bridge in Baohe Avenue, Hefei City, is carried out, and the seismic response of the bridge under different earthquake intensity is obtained. The probabilistic hazard curves of bridge seismic demand model and seismic demand parameter (EDP) are established by "Stripe" method. 4. The failure states of bridge piers, supports and falling beams are defined in detail. According to the calculation results of probabilistic seismic demand analysis, the probabilistic seismic failure analysis is carried out, and the seismic vulnerability curves of the main components are obtained.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55

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本文編號(hào)：1856262