發(fā)布時(shí)間：2018-06-17 22:30

  本文選題：鋼筋混凝土橋墩 + MOPSO算法��； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)建設(shè)的快速發(fā)展,橋梁工程的規(guī)模和數(shù)量都在不斷的提高。工程經(jīng)驗(yàn)表明一旦遭受強(qiáng)烈的地震作用,嚴(yán)重?fù)p壞的橋梁結(jié)構(gòu)勢(shì)必會(huì)造成不可估量的損失。基于性能的橋梁抗震設(shè)計(jì)方法以及橋梁全壽命多目標(biāo)優(yōu)化的聯(lián)合運(yùn)用,能夠更全面的考慮工程全壽命期內(nèi)的經(jīng)濟(jì)性和合理性。為了提高橋梁抗震驗(yàn)算及方案選擇的效率和全面性,將多目標(biāo)優(yōu)化算法和橋梁全壽命抗震性能設(shè)計(jì)聯(lián)合起來(lái),運(yùn)用Pushover靜力彈塑性分析,能夠快速的給出約束范圍內(nèi)的一系列符合抗震設(shè)計(jì)要求的方案,為設(shè)計(jì)提供充足的方案選擇空間。本文在國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃資助“973”項(xiàng)目(2011CB013605-4)、國(guó)家自然科學(xué)基金項(xiàng)目(51178079)和遼寧省優(yōu)秀人才基金資助項(xiàng)目(2014020012)的支持下,采用收斂性和可靠性能較優(yōu)的的多目標(biāo)粒子群算法(MOPSO)以及考慮橋梁全壽命周期內(nèi)的三個(gè)目標(biāo)費(fèi)用函數(shù)模型,結(jié)合橋梁結(jié)構(gòu)在不同抗震設(shè)防水準(zhǔn)下的抗震驗(yàn)算和靜力彈塑性分析。主要的研究工作如下：(1)總結(jié)回顧了文獻(xiàn)中橋梁工程在地震作用下的破壞形式和橋梁抗震設(shè)計(jì)理論、方法的研究進(jìn)展。闡述了基于性能的橋梁抗震設(shè)計(jì)方法的優(yōu)越性和工程應(yīng)用的合理性,給出了橋梁工程在兩級(jí)設(shè)防地震下的抗震設(shè)計(jì)過(guò)程。(2)總結(jié)分析了文獻(xiàn)中多目標(biāo)優(yōu)化算法的提出和發(fā)展過(guò)程,詳細(xì)論述了多目標(biāo)粒子群優(yōu)化算法MOPSO在解決多目標(biāo)優(yōu)化問(wèn)題時(shí)的良好性能和算法求解過(guò)程,分析了外部存儲(chǔ)文檔的應(yīng)用和特殊變異算子的運(yùn)用對(duì)算法求解的影響。(3)綜述了橋梁全壽命設(shè)計(jì)的發(fā)展和研究進(jìn)展,對(duì)比分析了不同的全壽命周期費(fèi)用模型的差異,并采用考慮橋梁初始造價(jià)、地震損失期望和后期拆除費(fèi)用的三目標(biāo)費(fèi)用函數(shù)模型對(duì)橋墩進(jìn)行全壽命抗震性能優(yōu)化設(shè)計(jì)分析。(4)采用MATLAB軟件對(duì)算法和橋墩抗震設(shè)計(jì)過(guò)程進(jìn)行編程,通過(guò)驗(yàn)算橋墩在E1和E2兩級(jí)設(shè)防水準(zhǔn)對(duì)應(yīng)的水平地震作用下的抗震性能和Pushover分析得到墩頂?shù)淖畲笪灰破坡?結(jié)合抗震規(guī)范中的三級(jí)設(shè)防水準(zhǔn)下的橋墩破壞超越概率得到相應(yīng)的橋墩遭受地震時(shí)的損失期望值、初始造價(jià)和后期拆除費(fèi)用。利用MOPSO算法對(duì)橋墩的全壽命費(fèi)用進(jìn)行抗震優(yōu)化選擇,最后得到Pareto最優(yōu)解。(5)對(duì)算法的穩(wěn)定性和可靠性進(jìn)行了對(duì)比計(jì)算分析,并給出了算法相應(yīng)參數(shù)的取值范圍。同時(shí)將橋墩的抗震設(shè)計(jì)轉(zhuǎn)化為一定約束范圍內(nèi)的多目標(biāo)優(yōu)化問(wèn)題進(jìn)行方案優(yōu)化設(shè)計(jì),能夠?yàn)楣こ烫峁┹^好的選擇空間。
[Abstract]:With the rapid development of economic construction in our country, the scale and quantity of bridge engineering are increasing continuously. Engineering experience shows that once strong earthquake action, serious damage to the bridge structure will inevitably cause incalculable losses. The performance-based seismic design method and the combined application of multi-objective optimization for the whole life of the bridge can consider the economy and rationality of the whole life cycle of the project more comprehensively. In order to improve the efficiency and comprehensiveness of bridge seismic checking calculation and scheme selection, the multi-objective optimization algorithm is combined with the whole life seismic performance design of the bridge, and the static elastoplastic analysis of pushover is used. It can quickly give a series of schemes that meet the requirements of seismic design in the range of constraints, and provide sufficient choice space for the design. This paper is supported by the National key basic Research and Development Program ("973" project "973" project "2011 CB013605-4", the National Natural Science Foundation project No. 51178079) and the Liaoning Province excellent talents Fund project (No. 2014020012). The multi-objective particle swarm optimization (MOPSO) algorithm with better convergence and reliability is adopted and three objective cost function models are considered in the whole life cycle of the bridge. The aseismic checking calculation and static elastic-plastic analysis of the bridge structure under different seismic fortification levels are combined. The main research work is as follows: (1) summarizing and reviewing the damage form of bridge engineering under earthquake and the research progress of bridge seismic design theory and method in literature. This paper expounds the superiority of performance-based seismic design method for bridges and the rationality of engineering application, and gives the aseismic design process of bridge engineering under two-level fortification. The good performance of multi-objective particle swarm optimization (MOPSO) algorithm and the process of solving the multi-objective optimization problem are discussed in detail. In this paper, the application of external storage documents and the influence of special mutation operator on the solution of the algorithm are analyzed. The development and research progress of bridge life design are summarized, and the differences of different life-cycle cost models are compared and analyzed. A three-objective cost function model considering the initial cost of the bridge, the expectation of earthquake loss and the cost of the later demolition is used to optimize the seismic performance of the pier for the whole life of the pier. The MATLAB software is used to program the algorithm and the aseismic design process of the pier. The maximum displacement drift rate of the pier is obtained by checking the seismic behavior and pushover analysis of the pier under the horizontal earthquake action corresponding to E1 and E2 level. The loss expectation, initial cost and later demolition cost of the pier are obtained by combining with the failure transcendence probability of the pier under the three-level fortification level in the aseismic code. Finally, the Pareto optimal solution is obtained. The stability and reliability of the algorithm are compared and analyzed, and the range of the corresponding parameters of the algorithm is given. At the same time, the seismic design of bridge piers can be transformed into a multi-objective optimization problem with certain constraints, which can provide a better choice space for the project.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U442.55

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本文編號(hào)：2032699