發(fā)布時(shí)間：2018-10-13 20:30

【摘要】：隨著國(guó)內(nèi)基礎(chǔ)建設(shè)的高速發(fā)展,我國(guó)沿海地區(qū)修建了大量的鋼筋混凝土橋梁,這些橋梁工程耗資巨大,關(guān)系到國(guó)計(jì)民生,大多需要長(zhǎng)達(dá)百年的服役期限。然而,惡劣的海洋環(huán)境長(zhǎng)年累月地對(duì)其進(jìn)行侵蝕,導(dǎo)致混凝土不可避免地逐漸老化、損傷甚至破壞。當(dāng)前橋梁工程的耐久性狀態(tài),引起了工程界對(duì)耐久性設(shè)計(jì)及評(píng)估的重視,但是業(yè)內(nèi)對(duì)橋梁耐久性和剩余壽命的評(píng)估尚無(wú)統(tǒng)一認(rèn)識(shí),耐久性設(shè)計(jì)意識(shí)匱乏。因此,對(duì)混凝土結(jié)構(gòu)耐久性進(jìn)行研究,并以此推動(dòng)工程應(yīng)用具有重大意義。本文對(duì)耐久性研究課題進(jìn)行整體梳理,從環(huán)境、材料、構(gòu)件和結(jié)構(gòu)等不同的角度入手,研究耐久性狀態(tài)的損傷和評(píng)價(jià)。首先通過(guò)研究海洋環(huán)境的特點(diǎn),對(duì)結(jié)構(gòu)環(huán)境作用進(jìn)行分類;其次分別研究了海洋環(huán)境對(duì)混凝土和鋼筋材料的影響,進(jìn)而對(duì)兩者的損傷機(jī)理進(jìn)行分析總結(jié)。在模擬材料損傷過(guò)程的同時(shí),分析了材料損傷過(guò)程中力學(xué)性能的變化;然后研究分析了鋼筋銹脹的損傷過(guò)程及破壞形態(tài),總結(jié)了現(xiàn)今應(yīng)用廣泛的多個(gè)鋼筋銹脹模型,通過(guò)算例分析對(duì)比各個(gè)模型的優(yōu)缺點(diǎn);重點(diǎn)研究了氯離子侵蝕的數(shù)學(xué)模型,對(duì)已有的經(jīng)典模型進(jìn)行修正,并給出了模型中各個(gè)數(shù)據(jù)的選取辦法及建議值,使其能夠良好地應(yīng)用在橋梁耐久性狀況監(jiān)測(cè)中;最后,本文通過(guò)對(duì)混凝土結(jié)構(gòu)耐久性準(zhǔn)則的分析,利用剩余壽命的評(píng)定方法,建立起一套針對(duì)耐久性狀況的數(shù)學(xué)評(píng)估辦法。模型應(yīng)用了模糊數(shù)學(xué)綜合評(píng)判法,為橋梁結(jié)構(gòu)建立層次清晰的評(píng)判框架,并采用了隸屬函數(shù)及貼近度原則,給出了解析矩陣和評(píng)判結(jié)論。本文通過(guò)對(duì)依托工程的實(shí)例分析,對(duì)該套評(píng)判系統(tǒng)的應(yīng)用意義進(jìn)行了驗(yàn)證。
[Abstract]:With the rapid development of domestic infrastructure, a large number of reinforced concrete bridges have been built in the coastal areas of China. These bridges cost a lot and are related to the national economy and the people's livelihood, and most of them require a service period of up to a hundred years. However, the severe marine environment erodes it year after year, which leads to the gradual aging, damage and even destruction of concrete. At present, the durability state of bridge engineering has aroused the attention of the engineering circles to the durability design and evaluation, but there is no unified understanding of the bridge durability and residual life evaluation in the industry, and the awareness of durability design is lacking. Therefore, it is of great significance to study the durability of concrete structure and to promote engineering application. In this paper, the durability research topic is combed as a whole, and the damage and evaluation of durability state are studied from different angles of environment, materials, components and structures. Firstly, by studying the characteristics of marine environment, the effects of structural environment are classified. Secondly, the effects of marine environment on concrete and reinforced materials are studied respectively, and the damage mechanism of both is analyzed and summarized. At the same time of simulating the damage process of materials, the change of mechanical properties in the process of material damage is analyzed, and then the damage process and failure form of steel bars are studied and analyzed. The advantages and disadvantages of each model are analyzed and compared by example, the mathematical model of chloride erosion is studied emphatically, the existing classical model is modified, and the method of selecting each data and the suggested value in the model are given. Finally, through the analysis of durability criterion of concrete structure and the evaluation method of residual life, a set of mathematical evaluation method for durability condition is established. The fuzzy mathematics comprehensive evaluation method is used in the model to establish a clear hierarchy evaluation framework for bridge structure. The membership function and the principle of closeness degree are adopted, and the analytical matrix and evaluation conclusions are given. In this paper, the application significance of the evaluation system is verified by the analysis of the supporting engineering.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U446

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 吳瑾,程吉昕;海洋環(huán)境下鋼筋混凝土結(jié)構(gòu)耐久性評(píng)估[J];水力發(fā)電學(xué)報(bào);2005年01期

2 朱炳喜;涵閘水上鋼筋混凝土構(gòu)件耐久性等級(jí)的模糊評(píng)估[J];水利水電技術(shù);2000年07期

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本文編號(hào)：2269803