發(fā)布時(shí)間：2018-11-27 11:58

【摘要】：長(zhǎng)久以來,混凝土都被視為一種耐久的材料。然而,現(xiàn)實(shí)卻是大量的混凝土結(jié)構(gòu)在投入使用一段時(shí)間后就出現(xiàn)了因耐久性退化而造成的結(jié)構(gòu)破壞。與一般建筑物相比,公路的服役環(huán)境更為惡劣,而且還承受著車輛荷載作用。在各劣化因素耦合作用下,包括公路在內(nèi)的許多混凝土結(jié)構(gòu)未達(dá)到設(shè)計(jì)年限便提前破壞。耐久性破壞所造成的損失是巨大的,這使得人們逐漸開始重視混凝土結(jié)構(gòu)的耐久性問題。本文對(duì)公路混凝土結(jié)構(gòu)的耐久性評(píng)估展開研究,提出了基于全壽命理論的公路混凝土結(jié)構(gòu)耐久性模糊評(píng)估方法,并以工程實(shí)例進(jìn)行了驗(yàn)證。主要進(jìn)行了如下研究:1.分析了一般情況下造成混凝土結(jié)構(gòu)耐久性劣化的原因。結(jié)合公路的技術(shù)特點(diǎn),分析劣化因素對(duì)公路混凝土耐久性的影響。2.闡述了目前的一些評(píng)估方法。重點(diǎn)介紹了模糊綜合評(píng)判法,并介紹了該方法進(jìn)行耐久性評(píng)估時(shí)的步驟及存在的不足。針對(duì)不足,引入全壽命理論,把影響混凝土結(jié)構(gòu)耐久性的因素分為促進(jìn)、衰退兩方面,提出了一種基于全壽命理論的混凝土結(jié)構(gòu)耐久性模糊評(píng)估方法。3.根據(jù)促進(jìn)因素及衰退因素,建立公路混凝土結(jié)構(gòu)耐久性評(píng)估的指標(biāo)體系,參考現(xiàn)行規(guī)范及相關(guān)研究成果,確定評(píng)價(jià)指標(biāo)的分級(jí)標(biāo)準(zhǔn)。同時(shí),在進(jìn)行因素權(quán)重劃分時(shí),本文采用了網(wǎng)絡(luò)層次分析法。4.根據(jù)本文確定的評(píng)估方法對(duì)一實(shí)際工程進(jìn)行評(píng)價(jià)分析。通過計(jì)算結(jié)果與現(xiàn)實(shí)情況對(duì)比,檢驗(yàn)該方法的有效性。本文建立了基于全壽命理論的公路混凝土結(jié)構(gòu)耐久性的模糊評(píng)價(jià)體系,進(jìn)一步完善和補(bǔ)充了混凝土結(jié)構(gòu)耐久性評(píng)估方面的研究,可以為結(jié)構(gòu)的維修、加固提供理論依據(jù),也可以反饋信息給設(shè)計(jì)、施工等部門,積累和總結(jié)工程經(jīng)驗(yàn)。同時(shí),該方法還可應(yīng)用于其他混凝土結(jié)構(gòu)的耐久性評(píng)估。
[Abstract]:Concrete has long been regarded as a durable material. However, the reality is that a large number of concrete structures have been damaged by durability degradation after being put into use for a period of time. Compared with the general buildings, the service environment of the highway is worse, and it also bears the effect of vehicle load. Under the coupling of various deterioration factors, many concrete structures, including highways, are destroyed in advance without reaching the design time. The damage caused by durability damage is huge, which makes people pay more attention to the durability of concrete structure. In this paper, the durability evaluation of highway concrete structure is studied, and a fuzzy evaluation method of highway concrete structure durability based on the whole life theory is put forward, which is verified by an engineering example. The main research is as follows: 1. The causes of durability deterioration of concrete structures under general conditions are analyzed. Combined with the technical characteristics of highway, the influence of deterioration factors on the durability of highway concrete is analyzed. 2. Some current evaluation methods are described. This paper mainly introduces the fuzzy comprehensive evaluation method, and introduces the steps and shortcomings of the method in durability evaluation. In view of the deficiency, this paper introduces the theory of whole life, divides the factors that affect the durability of concrete structure into two aspects: promotion and decline, and puts forward a fuzzy evaluation method of durability of concrete structure based on the theory of whole life. According to the factors of promotion and decline, the index system of durability evaluation of highway concrete structure is established, and the classification standard of evaluation index is determined by referring to the current norms and related research results. At the same time, in the division of factor weights, this paper uses the network analytic hierarchy process. 4. 4. According to the evaluation method determined in this paper, an actual project is evaluated and analyzed. The validity of the method is verified by comparing the calculation results with the actual situation. In this paper, a fuzzy evaluation system for durability of highway concrete structures based on the whole life theory is established, and the research on durability evaluation of concrete structures is further perfected and supplemented, which can provide a theoretical basis for the maintenance and reinforcement of concrete structures. Can also feedback information to design, construction and other departments, accumulated and summed up engineering experience. At the same time, the method can be used to evaluate the durability of other concrete structures.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U414

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本文編號(hào)：2360671