本文選題：耐久性 + 模糊數(shù)學(xué)　； 參考：《蘭州理工大學(xué)》2013年碩士論文

【摘要】：混凝土結(jié)構(gòu)已經(jīng)代替磚混結(jié)構(gòu),成為現(xiàn)代建筑結(jié)構(gòu)的主要形式。近年來,建于早期的許多建筑物在使用期限內(nèi)發(fā)生嚴(yán)重破壞,危及人民生命財產(chǎn)安全,這些破壞大多是由于鋼筋混凝土耐久性不足引起的。在未來一段時間內(nèi),我國將會有大量的混凝土結(jié)構(gòu)構(gòu)件進(jìn)入老化期。耐久性失效已經(jīng)構(gòu)成了“全球性的混凝土耐久性危機(jī)”,進(jìn)行混凝土結(jié)構(gòu)耐久性及其加固修復(fù)技術(shù)研究,對延長結(jié)構(gòu)使用壽命,防止重大事故發(fā)生,提高綜合經(jīng)濟(jì)效益等方面將具有重大意義。 本文在回顧以往對鋼筋混凝土結(jié)構(gòu)耐久性問題的研究成果的基礎(chǔ)上,對影響鋼筋混凝土結(jié)構(gòu)耐久性的因素做了進(jìn)一步研究,其主要內(nèi)容如下： 1、系統(tǒng)的總結(jié)了影響混凝土耐久性的因素,并用層次分析法對其進(jìn)行分層,用模糊層次分析法對某鋼筋混凝土梁進(jìn)行耐久性評價,評價結(jié)果與實(shí)際情況相符合,說明模糊綜合評價方法可操作性強(qiáng)、效果較好,可在混凝土耐久性評價方面廣泛應(yīng)用。 2、介紹了可靠度鑒定的有限元概率設(shè)計(PDS),以及可靠度理論在混凝土耐久性方面的應(yīng)用。 3、用大型有限元分析軟件ANSYS模擬分離式鋼筋混凝土梁,對裂縫寬度、深度、數(shù)量不同的梁進(jìn)行模擬分析,總結(jié)裂縫對鋼筋混凝土結(jié)構(gòu)耐久性的影響,并對其進(jìn)行可靠度評價。 最后得出結(jié)論： 1、基于層次分析法的模糊綜合評價在混凝土耐久性評價中取得了較好的效果,模型的建立符合實(shí)際情形。模糊綜合評價方法可操作性強(qiáng)、效果較好,可以很好地用在于混凝土結(jié)構(gòu)構(gòu)件的耐久性分析當(dāng)中,概率分析法已經(jīng)逐漸取代傳統(tǒng)經(jīng)驗法和實(shí)用鑒定法,將成為未來可靠性鑒定的主要方法。 2、可以用大型有限元分析軟件ANSYS,模擬裂縫條件下混凝土梁的的受力情況,確定裂縫對耐久性的影響程度,并確定不同裂縫條件下混凝土梁的可靠度。結(jié)果表明,裂縫對混凝土結(jié)構(gòu)構(gòu)件的耐久性有不利的影響,耐久性隨著裂縫寬度、深度及數(shù)量的增加而降低。對影響混凝土耐久性的其他因素,也可以用ANSYS軟件來進(jìn)行嘗試模擬。 3、裂縫對應(yīng)力及位移計算結(jié)果影響的效果不是十分顯著,這是因為裂縫對耐久性的影響并不是直接作用于梁上,而是主要是通過影響鋼筋銹蝕,降低鋼筋抗拉強(qiáng)度來降低鋼筋混凝土梁的耐久性。
[Abstract]:Concrete structure has replaced brick-concrete structure and become the main form of modern building structure.In recent years, many buildings built in the early period of life have been seriously damaged, endangering the safety of people's lives and property, most of which are caused by the lack of durability of reinforced concrete.In the future, a large number of concrete structural members in China will enter the aging period.The durability failure has already constituted "the global concrete durability crisis", carries on the concrete structure durability and the reinforcement and repair technology research, to prolong the structure service life, prevents the serious accident occurrence,It will be of great significance to improve the comprehensive economic benefits.On the basis of reviewing the previous researches on the durability of reinforced concrete structures, this paper makes a further study on the factors affecting the durability of reinforced concrete structures, the main contents of which are as follows:1. The factors that affect the durability of concrete are summarized systematically, and it is stratified by analytic hierarchy process (AHP), and the durability of a reinforced concrete beam is evaluated by fuzzy analytic hierarchy process (FAHP). The evaluation results are in accordance with the actual situation.It shows that fuzzy comprehensive evaluation method is feasible and effective, and can be widely used in concrete durability evaluation.2. The finite element probability design of reliability evaluation and the application of reliability theory in concrete durability are introduced.3. The split reinforced concrete beam is simulated by ANSYS, the crack width, depth and number of beams are simulated and analyzed, and the influence of cracks on the durability of reinforced concrete structure is summarized, and the reliability of the beam is evaluated.Finally, it is concluded that:1. The fuzzy comprehensive evaluation based on analytic hierarchy process (AHP) has achieved good results in concrete durability evaluation, and the establishment of the model is in line with the actual situation.The fuzzy comprehensive evaluation method has strong maneuverability and good effect. It can be well used in the durability analysis of concrete structural members. The probabilistic analysis method has gradually replaced the traditional empirical method and practical appraisal method.It will become the main method of reliability evaluation in the future.2. The finite element analysis software ANSYScan be used to simulate the stress of concrete beam under crack condition, determine the influence degree of crack on durability, and determine the reliability of concrete beam under different crack condition.The results show that cracks have an adverse effect on the durability of concrete structural members, and the durability decreases with the increase of crack width, depth and quantity.Other factors affecting the durability of concrete can also be simulated by ANSYS software.3. The effect of crack on stress and displacement calculation is not very significant, because the effect of crack on durability is not direct effect on beam, but mainly through influence on corrosion of steel bar.Reduce the tensile strength of steel bars to reduce the durability of reinforced concrete beams.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375

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