本文選題：混凝土　切入點(diǎn)：氯鹽侵蝕　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著跨海橋梁、海洋資源開采平臺(tái)等嚴(yán)酷服役環(huán)境中混凝土結(jié)構(gòu)得到越來越廣泛的運(yùn)用,混凝土結(jié)構(gòu)的耐久性問題也已經(jīng)變得日益突出。這些混凝土項(xiàng)目結(jié)構(gòu)的耐久性問題給世界各國(guó)都帶來了沉重的經(jīng)濟(jì)負(fù)擔(dān)。因此,利用全壽命周期成本分析(Life-Cycle Cost Analysis,LCCA)理論合理設(shè)計(jì)與優(yōu)化嚴(yán)酷服役環(huán)境中的混凝土項(xiàng)目結(jié)構(gòu)已經(jīng)成為當(dāng)前土木工程領(lǐng)域的研究熱點(diǎn)。本課題研究?jī)?nèi)容來自于國(guó)家自然科學(xué)基金項(xiàng)目“基于鋼筋銹蝕耐久性的混凝土結(jié)構(gòu)全壽命性能及設(shè)計(jì)理論研究(51378241)”,主要探討了自然侵蝕環(huán)境中鋼筋混凝土結(jié)構(gòu)的性能劣化過程,并根據(jù)結(jié)構(gòu)時(shí)變可靠度探尋了項(xiàng)目全壽命周期成本的評(píng)價(jià)方法,重點(diǎn)探討了基于運(yùn)營(yíng)階段的活動(dòng)成本的結(jié)構(gòu)設(shè)計(jì)方法。本研究的主要工作如下:1、探討了混凝土內(nèi)鋼筋的銹蝕反應(yīng)及其引起的結(jié)構(gòu)性能劣化過程。從鋼筋的初始銹蝕到混凝土銹脹裂縫的生成與發(fā)展,本文探討了自然侵蝕環(huán)境中混凝土內(nèi)鋼筋銹蝕的發(fā)展過程,提出了以鋼筋發(fā)生初始銹蝕、鋼筋發(fā)生適量銹蝕等臨界條件為極限狀態(tài)的混凝土結(jié)構(gòu)構(gòu)件耐久壽命分析方法,反映了鋼筋銹蝕對(duì)混凝土結(jié)構(gòu)適用性能的影響。同時(shí)通過長(zhǎng)期氯鹽侵蝕環(huán)境干濕循環(huán)試驗(yàn)獲得的銹蝕鋼筋試樣,探討了該試驗(yàn)環(huán)境下鋼筋的不均勻銹蝕形態(tài)與力學(xué)性能劣化情況,表明了鋼筋銹蝕對(duì)混凝土結(jié)構(gòu)承載能力的影響。以上研究結(jié)果充分說明了利用全壽命周期理論進(jìn)行鋼筋銹蝕環(huán)境下混凝土結(jié)構(gòu)設(shè)計(jì)與優(yōu)化的現(xiàn)實(shí)意義與研究?jī)r(jià)值。2、建立了混凝土結(jié)構(gòu)全壽命周期成本分析模型與設(shè)計(jì)理論框架。參考國(guó)際標(biāo)準(zhǔn)(ISO2394,1998)給出的優(yōu)化策略作為目標(biāo)函數(shù),初步探討了項(xiàng)目結(jié)構(gòu)全壽命周期成本最小的優(yōu)化方法。利用概率分析理論方法建立了包括項(xiàng)目結(jié)構(gòu)的初始成本、日常養(yǎng)護(hù)成本、服役期內(nèi)運(yùn)營(yíng)活動(dòng)成本、失效成本和剩余價(jià)值等成本項(xiàng)在內(nèi)的全壽命周期成本分析預(yù)測(cè)模型。并在此基礎(chǔ)上初步探討了混凝土結(jié)構(gòu)耐久性設(shè)計(jì)的優(yōu)化方法,提出了使結(jié)構(gòu)全壽命周期成本趨向最小的參數(shù)選取思路,為后續(xù)優(yōu)化鋼筋混凝土結(jié)構(gòu)全壽命設(shè)計(jì)的研究工作提供參考。3、氯鹽侵蝕環(huán)境中混凝土結(jié)構(gòu)全壽命周期時(shí)變可靠度計(jì)算分析。為了預(yù)測(cè)氯鹽侵蝕環(huán)境中混凝土結(jié)構(gòu)的全壽命周期劣化過程,本研究將其全壽命周期劃分為氯離子運(yùn)輸階段和縱向銹脹裂縫發(fā)展階段。基于現(xiàn)有的混凝土中氯離子運(yùn)輸模型和鋼筋銹蝕引起的縱向銹脹裂縫寬度預(yù)測(cè)模型,本文利用Monte-Carlo抽樣模擬法得到了不同設(shè)計(jì)條件下的混凝土結(jié)構(gòu)時(shí)變失效概率與可靠指標(biāo)曲線,并擬合得到了相應(yīng)的計(jì)算模型。通過比較不同設(shè)計(jì)條件下混凝土?xí)r變劣化曲線,本文初步探討了如何優(yōu)化鋼筋銹蝕環(huán)境下混凝土結(jié)構(gòu)全壽命周期設(shè)計(jì)。4、初探了氯鹽侵蝕環(huán)境中混凝土結(jié)構(gòu)全壽命周期設(shè)計(jì)方法。根據(jù)前文得到的不同設(shè)計(jì)條件下時(shí)變可靠度曲線,探討了不同運(yùn)營(yíng)階段維護(hù)與加固活動(dòng)對(duì)項(xiàng)目結(jié)構(gòu)可靠指標(biāo)的影響,并且建立了不同的運(yùn)營(yíng)階段維護(hù)與加固活動(dòng)布置方案下的運(yùn)營(yíng)階段成本計(jì)算評(píng)估方法。隨后以實(shí)際海洋環(huán)境中混凝土結(jié)構(gòu)為例計(jì)算了相應(yīng)的運(yùn)營(yíng)階段成本,通過對(duì)運(yùn)營(yíng)成本計(jì)算結(jié)果的比較分析,初步探尋了鋼筋銹蝕條件下混凝土結(jié)構(gòu)的全壽命周期成本優(yōu)化的理論方法。最后,以混凝土綠色性能為優(yōu)化目的改進(jìn)混凝土配合比的設(shè)計(jì)方法。
[Abstract]:With the cross sea bridge, marine resources exploitation platform and other harsh service environment in concrete structure has been used more and more widely, the durability of the concrete structure has become increasingly prominent. The problem of durability concrete project structure for all countries in the world have brought a heavy economic burden. Therefore, the analysis of life cycle cost (Life-Cycle Cost Analysis, LCCA) and optimization of concrete structure project harsh environment has become a hot research topic in the field of civil engineering design theory. The research content of the thesis comes from the National Natural Science Foundation Project "Research on performance and design theory of reinforced concrete structure corrosion durability based on whole life (51378241)", mainly discusses the deterioration process of the reinforced concrete structure of natural erosion in the environment, and to explore the reliability of the whole project according to the structure The evaluation method of life cycle cost, discusses the structure design method of the operational phase of the activity based cost. The main work of this research are as follows: 1, discusses the corrosion reaction in concrete and its structural performance deterioration caused by the process. From the initial to the formation and development of corroded reinforced concrete crack. This paper discusses the development process of reinforcement corrosion in concrete erosion of natural environment, put forward to the reinforced concrete structure component for initial corrosion, durability limit state analysis method of critical conditions of moderate corrosion of reinforced, reflects the influence of reinforcement corrosion on concrete structure performance. At the same time through long-term Chloride Erosion corrosion test specimens for the dry wet cycling experiment, discusses the reinforcement of the test environment, uniform corrosion morphology and mechanical properties of the deterioration of the situation, show the rust Effect of corrosion on the bearing capacity of the concrete structure. The above results fully illustrate the practical significance and research value of.2 using the theory of whole life cycle design and optimization of concrete structure corrosion environment, establish the concrete structure of the life cycle cost analysis model and design theory frame. According to international standards (ISO23941998) optimization strategy is given as the objective function, discusses the optimization method of minimum project structure of life cycle cost analysis method. Including the establishment of the initial cost of the project structure by using probability, daily maintenance cost, operation cost of service period, analysis and prediction model of life cycle cost and failure cost and other costs, the surplus value and on the basis of. The preliminary optimization method of durability design of concrete structure is discussed, it is proposed that the structure of life cycle cost trend The idea of choosing the minimum parameters, provide a reference for further research on the optimization of.3 reinforced concrete structure of whole life design, reliability analysis and calculation of concrete structure the whole life cycle of chloride erosion environment. For the whole life cycle deterioration process of concrete structure prediction of Chloride Erosion in the environment, the study of its whole life cycle divided into chloride ion transport phase and longitudinal crack development stage. Prediction model of longitudinal crack width caused by the existing transport model of chloride ions in concrete and steel corrosion based on the Monte-Carlo sampling simulation method has been concrete structure with different design conditions when the failure probability and reliability index curve and fitting the corresponding calculation model. The deterioration curve through concrete comparison of different design conditions, this paper discusses how to optimize the corrosion environment The design of.4 under the whole life cycle of concrete structure, concrete structure life cycle method of chlorine salt erosion in design. According to the reliability curve under different design conditions obtained above, discusses the different operation periods of the maintenance and strengthening of project structure reliability index of the effect, and establish the evaluation method of calculating operation stage the cost of operation of different stages of maintenance and reinforcement arrangement activities under the program. Then the concrete structures in the marine environment in the case of the actual operation stage cost calculated, through the calculation results of the operating costs of the comparative analysis, probes into the theory and method of life cycle cost optimization of the concrete structure corrosion conditions. Finally, optimization objective to improve the concrete mix design method based on green performance concrete.

【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375

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