【摘要】：隨著工程結(jié)構(gòu)服役時間的推移,大量的混凝土結(jié)構(gòu)進(jìn)入老化階段。由于耐久性損傷導(dǎo)致的建筑物或構(gòu)筑物可靠度下降,帶來了越來越大的經(jīng)濟(jì)損失,這使得鋼筋混凝土結(jié)構(gòu)的耐久性破壞成為迫切需要解決的問題,尤其是熱力地下構(gòu)筑物的耐久性損傷。而目前國內(nèi)對以熱力地下管溝(磚砌結(jié)構(gòu)、鋼筋混凝土結(jié)構(gòu)、暗挖隧道以及結(jié)構(gòu)內(nèi)附件等)為代表的城市既有地下工程,缺乏針對結(jié)構(gòu)處置的系統(tǒng)性研究。城市老舊熱力地下構(gòu)筑物進(jìn)行翻修改造時在結(jié)構(gòu)處置問題的判定上尚缺乏理論依據(jù)。本文利用現(xiàn)場檢測、數(shù)值模擬等手段對在役熱力隧道結(jié)構(gòu)進(jìn)行了可靠度計(jì)算和耐久性等級評估,具體的研究工作如下：(1)按照構(gòu)筑物的類型,分別對磚砌與鋼筋混凝土蓋板組合結(jié)構(gòu)、澆筑鋼筋混凝土結(jié)構(gòu)和噴射混凝土結(jié)構(gòu)進(jìn)行了現(xiàn)場檢測與統(tǒng)計(jì)分析,得出了不同結(jié)構(gòu)類型的技術(shù)狀況和各檢測項(xiàng)目的統(tǒng)計(jì)規(guī)律。(2)引入響應(yīng)面法,利用Midas/Gen有限元分析軟件分別對小室、隧道結(jié)構(gòu)進(jìn)行建模計(jì)算,得到了結(jié)構(gòu)典型截面處荷載效應(yīng)的統(tǒng)計(jì)特征,然后利用Matlab中的優(yōu)化工具箱分別對小室與隧道結(jié)構(gòu)進(jìn)行了可靠度指標(biāo)的計(jì)算。(3)運(yùn)用模糊評價的方法將結(jié)構(gòu)的耐久性評估分為兩級,分別用層次分析法建立每一級各影響因素的權(quán)重集,最終根據(jù)貼近度法對30個工點(diǎn)分別進(jìn)行了耐久性等級評估。(4)在對熱力地下構(gòu)筑物進(jìn)行模糊評價的基礎(chǔ)上,將模糊評價法與馬爾科夫過程相結(jié)合,以華能線10#工點(diǎn)為例,對其進(jìn)行了剩余壽命預(yù)測,為隧道在未來使用過程中的維修加固提供了理論依據(jù)。
[Abstract]:As the service time of engineering structure goes on, a large number of concrete structures enter the aging stage. Due to the deterioration of the reliability of buildings or structures caused by durability damage, it brings more and more economic losses, which makes the durability damage of reinforced concrete structures an urgent problem to be solved. Especially the durability damage of thermal underground structures. At present, there is a lack of systematic research on the existing underground engineering in the cities represented by thermal underground pipe trenches (brick structure, reinforced concrete structure, tunneling and internal structure accessories), and lack of systematic research on the disposal of structures. There is no theoretical basis for judging the problem of structure disposal when the old urban thermal underground structure is renovated and renovated. In this paper, reliability calculation and durability grade evaluation of existing thermal tunnel structures are carried out by means of field inspection and numerical simulation. The specific research work is as follows: (1) according to the type of structure, The combined structure of brick and reinforced concrete cover slab, the reinforced concrete structure and the shotcrete structure are tested and analyzed respectively. The technical status of different structure types and the statistical rules of each test item are obtained. (2) the response surface method is introduced and the cell and tunnel structures are modeled and calculated by using Midas/Gen finite element analysis software. The statistical characteristics of the load effect at the typical section of the structure are obtained, and then the reliability index of the chamber and tunnel structure is calculated by using the optimization toolbox of Matlab. (3) the durability evaluation of the structure is divided into two levels by using the fuzzy evaluation method. The weight sets of each influencing factor are established by AHP, and the durability grade of 30 working points is evaluated according to the closeness degree method. (4) on the basis of fuzzy evaluation of thermal underground structure, This paper combines fuzzy evaluation method with Markov process and takes 10# point of Huaneng Line as an example to predict its residual life which provides a theoretical basis for the maintenance and reinforcement of tunnel in the future.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU311.2

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