地下大直径钢筋混凝土粮食筒仓可靠性研究

发布时间：2018-04-24 16:22

本文选题：地下粮食筒仓 + 随机参数　；参考：《河南工业大学》2015年硕士论文

【摘要】：地下大直径钢筋混凝土粮食筒仓作为地下储粮的一种新型式,是我国粮仓建设潜在的一个新发展方向,其在保持了原有地下仓优势的基础上,又克服了现有地下仓部分的不足。地下粮食筒仓和其它地下结构一样,在整个设计施工及运营过程中存在大量的不确定性,这就需要许多科研工作者对这种新的储粮结构型式进行更深入的研究,避免出现较大程度的结构失效和事故发生。为了对地下大直径钢筋混凝土粮食筒仓的设计参数进行模拟分析并做出安全性评价,以及得到影响结构可靠性较大的设计参数,并在设计和施工过程中进行准确的选取和严格的控制。本文旨在研究地下大直径钢筋混凝土粮食筒仓的可靠性,为地下大直径钢筋混凝土粮食筒仓的设计提供依据,也为地下大直径钢筋混凝土粮食筒仓施工的安全性提供参考。本文以地下大直径钢筋混凝土粮食筒仓为研究对象,以《河南金地集团粮食物流园区岩土工程勘察报告》提供的工程地质条件为参考依据,在最不利荷载工况下研究地下大直径钢筋混凝土粮食筒仓仓壁的变形和内力;在地下粮食筒仓施工期间对回填过程中仓壁的侧压力和仓壁及仓底的内力进行现场监测;建立地下水土作用下的地下大直径钢筋混凝土粮食筒仓有限元模型;得到地下大直径钢筋混凝土粮食筒仓在不同控制条件下的失效概率,并对主要随机参数进行灵敏度和相关性系数分析。具体研究内容和方法如下:(1)以地下大直径钢筋混凝土粮食筒仓为研究对象,在前人的研究基础上,根据柱壳有矩理论及无矩壳体理论,得到地下大直径钢筋混凝土粮食筒仓最不利荷载工况下地下粮食筒仓仓壁的变形和内力计算公式;通过算例计算,将文中推导的方法的结果与无矩壳体理论结果和前人方法的结果以及数值模拟结果进行对比分析;最后将受力比较复杂的仓底附近的仓壁单独进行变形和内力分析,研究仓底附近仓壁的变形和内力情况。(2)在地下钢筋混凝土筒仓建设过程中,通过对在回填过程中,其仓壁侧压力和仓壁及仓底内力进行现场监测;将实测的仓壁环向力计算得到仓壁侧压力,与实测仓壁侧压力进行对比;然后根据监测结果研究将仓壁的环向压力与公式计算结果进行比对;从理论到模拟再到现场监测三个方面,研究地下大直径钢筋混凝土粮食筒仓仓壁侧压力、变形及内力的变化趋势。(3)根据结构的承载能力极限状态和正常使用极限状态分析,依据不同的控制条件分别建立由地下粮食筒仓仓体强度、仓体裂缝、仓顶梁板结构挠度和仓壁结构变形控制的的四个功能函数,将材料特性参数和荷载特性参数作为输入参数,以ANSYS为分析工具,选择概率设计(PDS),应用较为广泛的Monte Carlo分析方法,选取拉丁超立方抽样法(Latin Hypercube)对功能函数执行可靠性计算,得到功能函数的失效概率和可靠度指标。从地下粮食筒仓仓体强度、仓体裂缝、仓顶梁板结构挠度和仓壁结构变形四个方面分析地下大直径钢筋混凝土粮食筒仓结构的可靠性。(4)通过对概率设计(PDS)Monte Carlo法输出结果中的随机参数与功能函数的灵敏度进行分析,得到灵敏度大于2.5%的随机参数,然后对其进行相关性系数进行探讨,得到提高功能函数可靠度指标的主要参数,提出在施工过程能够提高可靠度指标的措施,并在施工中应该得到注意和严格控制。
[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.

【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU93;TU375

【参考文献】