本文選題：跨海橋墩 + 多次地震　； 參考：《大連理工大學》2015年碩士論文

【摘要】：跨海橋梁具有建設(shè)投資大、設(shè)計服役期長、工作環(huán)境惡劣并且面臨較高的地震作用風險等特點。近年來隨著中國對基礎(chǔ)設(shè)施建設(shè)的需求和投入不斷加大,跨海橋梁工程的建設(shè)也日趨繁榮。橋墩作為最重要的受力部件,在跨海橋梁服役的全壽命過程中保持安全可靠的性能至關(guān)重要。歷史地震資料和國內(nèi)外學者的研究表明,跨海橋墩在服役過程中可能會受到嚴重的氯離子腐蝕作用和多次地震作用。針對于此,本文主要進行了以下幾個方面的研究工作：(1)基于歷史地震統(tǒng)計資料、地震危險性分析模型和統(tǒng)計學原理討論了不同形式的多次地震作用在結(jié)構(gòu)服役期內(nèi)出現(xiàn)的概率。分析結(jié)果表明結(jié)構(gòu)在其服役的全壽命周期內(nèi)遭遇兩次或者兩次以上完全不相關(guān)的地震或地震序列的概率是極低的,但是其遭遇一次包含多個地震動的地震序列的概率是非常大的,因此有必要對這種地震序列作用情況進行研究。(2)在國外學者提出的地震序列構(gòu)造方法基礎(chǔ)上通過從PEER強震數(shù)據(jù)庫引入10組相同臺站記錄的實際主余震記錄構(gòu)造出更加符合真實情況的地震動序列；在進行非線性動力時程分析時將一組地震動序列連續(xù)輸入到橋墩模型中以考慮其在多次地震作用下的累積損傷情況。(3)討論了對跨海橋墩耐久性影響最大的氯離子腐蝕作用并基于Life-365軟件分析了海洋環(huán)境所使用的高性能混凝土中鋼筋的銹蝕情況。計算結(jié)果表明盡管跨海橋墩采用了高性能混凝土和阻銹劑等防護措施,但在其長達百年的服役過程中仍然難以避免受到氯離子腐蝕作用,導致鋼筋開始銹蝕并進而影響橋墩的抗震性能。(4)基于增量動力分析和地震易損性分析方法對橋墩在服役過程中的未腐蝕階段、鋼筋開始銹蝕后的橋墩服役第60年、80年和100年進行了分析,同時比較了橋墩在單獨主震和地震序列作用下的反應(yīng)差異。分析結(jié)果表明,在輕微破壞狀態(tài)時,橋墩基本保持線性工作狀態(tài),此時其受服役時間和地震序列作用的影響不大；在中等破壞、嚴重破壞和完全破壞狀態(tài)時,橋墩進入了塑性狀態(tài),此時服役時間和地震序列作用對橋墩的墩頂位移反應(yīng)和易損性曲線有很大的影響,橋墩更容易進入危險狀態(tài)。
[Abstract]:Cross-sea bridges are characterized by large construction investment, long design service period, poor working environment and high seismic risk. In recent years, with the increasing demand and investment in infrastructure construction in China, the construction of cross-sea bridge projects is also increasingly prosperous. As the most important force component, it is very important to maintain the safe and reliable performance of bridge pier in the whole service life of bridge across the sea. The historical seismic data and the research of scholars at home and abroad show that the bridge piers across the sea may be subjected to severe chloride corrosion and multiple earthquakes in the course of service. In this paper, the following aspects of the research work are mainly carried out: (1) based on historical seismic statistics, The seismic hazard analysis model and statistical principles are used to discuss the probability of the occurrence of multiple earthquakes in different forms during the service period of the structure. The results show that the probability of the structure being subjected to two or more completely unrelated earthquakes or earthquake sequences during its life cycle is extremely low. But the probability that it will encounter an earthquake sequence that contains more than one earthquake motion is very high. Therefore, it is necessary to study the action of this kind of earthquake sequence. (2) based on the structural method of earthquake sequence proposed by foreign scholars, by introducing 10 sets of actual aftershock records of the same station records from the peer strong earthquake database, the authors have obtained the following results: 1. The sequence of ground motion that is more consistent with the real situation; In nonlinear dynamic time-history analysis, a series of ground motion sequences are continuously input into the pier model in order to consider the cumulative damage caused by multiple earthquakes. (3) the chloride ions, which have the greatest influence on the durability of bridge piers across the sea, are discussed. Corrosion behavior and corrosion of steel bars in high performance concrete used in marine environment were analyzed based on Life-365 software. The results show that despite the use of protective measures such as high performance concrete and rust inhibitor, it is still difficult to avoid chloride corrosion in the course of its service for a hundred years. It leads to the corrosion of steel bar and then affects the seismic performance of pier. (4) based on incremental dynamic analysis and seismic vulnerability analysis method, the bridge pier is not corroded in the process of service. In the 60th, 80th and 100th year of service of the corroded bridge pier, the responses of the pier under the action of single main shock and earthquake sequence are analyzed and the difference of the response of the pier under the action of single main shock and earthquake sequence is also compared. The analysis results show that the piers are basically in linear working condition in the condition of slight failure, and are not affected by the effect of service time and earthquake sequence, while in the condition of moderate, severe and complete failure, the bridge pier is in a linear working state, and the bridge pier is not affected by the effect of service time and earthquake sequence. The pier is in a plastic state, and the service time and earthquake sequence have a great influence on the displacement response and vulnerability curve of the pier, and the pier is easier to enter the dangerous state.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55;U443.22

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本文編號：2093270