本文選題：地下糧食筒倉(cāng) + 隨機(jī)參數(shù)��； 參考：《河南工業(yè)大學(xué)》2015年碩士論文

【摘要】：地下大直徑鋼筋混凝土糧食筒倉(cāng)作為地下儲(chǔ)糧的一種新型式,是我國(guó)糧倉(cāng)建設(shè)潛在的一個(gè)新發(fā)展方向,其在保持了原有地下倉(cāng)優(yōu)勢(shì)的基礎(chǔ)上,又克服了現(xiàn)有地下倉(cāng)部分的不足。地下糧食筒倉(cāng)和其它地下結(jié)構(gòu)一樣,在整個(gè)設(shè)計(jì)施工及運(yùn)營(yíng)過(guò)程中存在大量的不確定性,這就需要許多科研工作者對(duì)這種新的儲(chǔ)糧結(jié)構(gòu)型式進(jìn)行更深入的研究,避免出現(xiàn)較大程度的結(jié)構(gòu)失效和事故發(fā)生。為了對(duì)地下大直徑鋼筋混凝土糧食筒倉(cāng)的設(shè)計(jì)參數(shù)進(jìn)行模擬分析并做出安全性評(píng)價(jià),以及得到影響結(jié)構(gòu)可靠性較大的設(shè)計(jì)參數(shù),并在設(shè)計(jì)和施工過(guò)程中進(jìn)行準(zhǔn)確的選取和嚴(yán)格的控制。本文旨在研究地下大直徑鋼筋混凝土糧食筒倉(cāng)的可靠性,為地下大直徑鋼筋混凝土糧食筒倉(cāng)的設(shè)計(jì)提供依據(jù),也為地下大直徑鋼筋混凝土糧食筒倉(cāng)施工的安全性提供參考。本文以地下大直徑鋼筋混凝土糧食筒倉(cāng)為研究對(duì)象,以《河南金地集團(tuán)糧食物流園區(qū)巖土工程勘察報(bào)告》提供的工程地質(zhì)條件為參考依據(jù),在最不利荷載工況下研究地下大直徑鋼筋混凝土糧食筒倉(cāng)倉(cāng)壁的變形和內(nèi)力;在地下糧食筒倉(cāng)施工期間對(duì)回填過(guò)程中倉(cāng)壁的側(cè)壓力和倉(cāng)壁及倉(cāng)底的內(nèi)力進(jìn)行現(xiàn)場(chǎng)監(jiān)測(cè);建立地下水土作用下的地下大直徑鋼筋混凝土糧食筒倉(cāng)有限元模型;得到地下大直徑鋼筋混凝土糧食筒倉(cāng)在不同控制條件下的失效概率,并對(duì)主要隨機(jī)參數(shù)進(jìn)行靈敏度和相關(guān)性系數(shù)分析。具體研究?jī)?nèi)容和方法如下:(1)以地下大直徑鋼筋混凝土糧食筒倉(cāng)為研究對(duì)象,在前人的研究基礎(chǔ)上,根據(jù)柱殼有矩理論及無(wú)矩殼體理論,得到地下大直徑鋼筋混凝土糧食筒倉(cāng)最不利荷載工況下地下糧食筒倉(cāng)倉(cāng)壁的變形和內(nèi)力計(jì)算公式;通過(guò)算例計(jì)算,將文中推導(dǎo)的方法的結(jié)果與無(wú)矩殼體理論結(jié)果和前人方法的結(jié)果以及數(shù)值模擬結(jié)果進(jìn)行對(duì)比分析;最后將受力比較復(fù)雜的倉(cāng)底附近的倉(cāng)壁單獨(dú)進(jìn)行變形和內(nèi)力分析,研究倉(cāng)底附近倉(cāng)壁的變形和內(nèi)力情況。(2)在地下鋼筋混凝土筒倉(cāng)建設(shè)過(guò)程中,通過(guò)對(duì)在回填過(guò)程中,其倉(cāng)壁側(cè)壓力和倉(cāng)壁及倉(cāng)底內(nèi)力進(jìn)行現(xiàn)場(chǎng)監(jiān)測(cè);將實(shí)測(cè)的倉(cāng)壁環(huán)向力計(jì)算得到倉(cāng)壁側(cè)壓力,與實(shí)測(cè)倉(cāng)壁側(cè)壓力進(jìn)行對(duì)比;然后根據(jù)監(jiān)測(cè)結(jié)果研究將倉(cāng)壁的環(huán)向壓力與公式計(jì)算結(jié)果進(jìn)行比對(duì);從理論到模擬再到現(xiàn)場(chǎng)監(jiān)測(cè)三個(gè)方面,研究地下大直徑鋼筋混凝土糧食筒倉(cāng)倉(cāng)壁側(cè)壓力、變形及內(nèi)力的變化趨勢(shì)。(3)根據(jù)結(jié)構(gòu)的承載能力極限狀態(tài)和正常使用極限狀態(tài)分析,依據(jù)不同的控制條件分別建立由地下糧食筒倉(cāng)倉(cāng)體強(qiáng)度、倉(cāng)體裂縫、倉(cāng)頂梁板結(jié)構(gòu)撓度和倉(cāng)壁結(jié)構(gòu)變形控制的的四個(gè)功能函數(shù),將材料特性參數(shù)和荷載特性參數(shù)作為輸入?yún)?shù),以ANSYS為分析工具,選擇概率設(shè)計(jì)(PDS),應(yīng)用較為廣泛的Monte Carlo分析方法,選取拉丁超立方抽樣法(Latin Hypercube)對(duì)功能函數(shù)執(zhí)行可靠性計(jì)算,得到功能函數(shù)的失效概率和可靠度指標(biāo)。從地下糧食筒倉(cāng)倉(cāng)體強(qiáng)度、倉(cāng)體裂縫、倉(cāng)頂梁板結(jié)構(gòu)撓度和倉(cāng)壁結(jié)構(gòu)變形四個(gè)方面分析地下大直徑鋼筋混凝土糧食筒倉(cāng)結(jié)構(gòu)的可靠性。(4)通過(guò)對(duì)概率設(shè)計(jì)(PDS)Monte Carlo法輸出結(jié)果中的隨機(jī)參數(shù)與功能函數(shù)的靈敏度進(jìn)行分析,得到靈敏度大于2.5%的隨機(jī)參數(shù),然后對(duì)其進(jìn)行相關(guān)性系數(shù)進(jìn)行探討,得到提高功能函數(shù)可靠度指標(biāo)的主要參數(shù),提出在施工過(guò)程能夠提高可靠度指標(biāo)的措施,并在施工中應(yīng)該得到注意和嚴(yán)格控制。
[Abstract]:As a new type of underground grain stored grain, the underground large diameter reinforced concrete silo is a potential new development direction in the construction of the granary in China. On the basis of maintaining the advantages of the original underground storehouse, it has overcome the shortage of the existing subsurface silos. There are a lot of uncertainties in the process, which requires a lot of researchers to do a more thorough study of this new type of storage structure to avoid a large degree of structural failure and accident. In order to simulate and analyze the design parameters of the underground large diameter reinforced concrete grain silos, and to make a safety evaluation, and The design parameters which affect the reliability of the structure are obtained, and the accurate selection and strict control are carried out in the process of design and construction. The purpose of this paper is to study the reliability of the large diameter reinforced concrete silos of underground diameter, the basis for the design of the large diameter reinforced concrete silo underground, and the large diameter RC grain for underground diameter. This paper takes the underground large diameter reinforced concrete silo as the research object, taking the engineering geological conditions provided by the geotechnical engineering survey report of the grain logistics park of Henan Jindi group, and studying the wall of the large diameter reinforced concrete silo under the most unfavorable load condition. In the construction of underground grain silo, the lateral pressure of the silo wall and the internal force of the silo wall and the bottom of the silo are monitored during the construction of the underground grain silo, and the finite element model of the large diameter reinforced concrete silo under underground soil and water soil is established, and the loss of the underground large diameter reinforced concrete silo under different control conditions is obtained. The sensitivity and correlation coefficient of the main random parameters are analyzed. The specific contents and methods are as follows: (1) the large diameter RC grain silos with large diameter are used as the research object. On the basis of the previous research, the large diameter RC grain silos with large diameter are obtained according to the moment theory of the cylindrical shells and the theory of the shell free shell. The calculation formula of the deformation and internal force of the silo wall of the underground grain silo under the unfavorable load condition is calculated by a calculation example. The results of the method derived in this paper are compared with the results of the moment shell theory and the results of the previous methods and the numerical simulation results. Finally, the silo wall near the bottom of the silo which has a relatively complex force is deformed and inside. Force analysis, study the deformation and internal force of the silo wall near the bottom of the silo. (2) in the construction process of the underground reinforced concrete silo, the pressure of the wall side and the inner force of the silo wall and the bottom of the silo are monitored in the process of backfilling, and the pressure of the silo wall is calculated by the measured storewall ring force, and the pressure of the wall side is compared with the measured wall pressure; and then the root is compared. According to the monitoring results, the annular pressure of the silo wall is compared with the formula calculation results. From the theory to the simulation to the site monitoring three aspects, the change trend of the wall pressure, deformation and internal force of the underground large diameter reinforced concrete silo is studied. (3) the analysis of the bearing capacity limit state and the normal use limit state according to the structure. According to the different control conditions, four function functions are established, which are the strength of the silo body, the crack of the silo, the deflection of the roof beam and the deformation of the wall structure, and the parameters of the material and the load characteristics are used as the input parameters, and the ANSYS is used as the analysis tool, the probability design (PDS) is selected, and the more extensive Monte C is applied. The Arlo analysis method selected the Latin hypercube sampling method (Latin Hypercube) to calculate the function function reliability, and get the failure probability and reliability index of the function function, and analyze the large diameter reinforced concrete grain from four aspects: the strength of the silo body, the crack of the silo, the structure deflection of the roof beam and the structure of the wall structure. The reliability of the silo structure. (4) through the analysis of the sensitivity of the random parameters and functional functions in the output of the probability design (PDS) Monte Carlo method, the random parameters with sensitivity greater than 2.5% are obtained, and then the correlation coefficient is discussed, and the main parameters to improve the reliability index of the power function are obtained, and the construction is put forward in the construction. Cheng can improve the reliability index measures and should be noticed and strictly controlled in construction.

【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】：2015
【分類號(hào)】：TU93;TU375

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張啟輝,朱葒,趙錫宏;考慮收縮與溫度應(yīng)力的鋼筋混凝土支撐軸力研究[J];巖土工程技術(shù);2000年01期

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本文編號(hào)：1797369