本文選題：模板支架 + 人為過失��； 參考：《北京交通大學》2013年碩士論文

【摘要】：本文以施工期模板支架為研究對象,經(jīng)過分析研究,完成以下工作,得出以下結論： (1)搜集整理我國近十二年內,模板支架的坍塌事故,從支架的類型、支架的高度、坍塌的階段、發(fā)生破壞的永久結構的類型、傷亡的程度和導致坍塌的原因幾個方面,做了統(tǒng)計分析,總結了事故發(fā)生的特點,從內因、外因和管理方面的原因三方面進行分析,總結導致我國模板支架坍塌事故頻繁發(fā)生的根本原因； (2)針對功能函數(shù)是隱式或者功能函數(shù)復雜的情況,提出了一個新的靈敏度因子近似計算公式,并驗證了公式的可行性； (3)對影響模板支架的極限承載力隨機變量做敏感性分析,根據(jù)計算結果將步距、鋼管壁厚、擰緊扭力矩、立桿超出頂層水平桿長度視為對可靠性影響較大的隨機變量,同時忽略立桿水平間距的隨機性； (4)計算不同工況下的高大模板支架的極限承載力,并對模板支架的極限承載力進行擬合,確定抗力的概率模型,通過參考文獻獲得荷載的概率模型,建立模板支架的極限狀態(tài)方程,利用蒙特卡羅法計算支架的可靠度； (5)計算有人為過失、無人為過失和無剪刀撐三種情況下的可靠度。根據(jù)目標可靠度指標的要求,反算人為過失發(fā)生概率的上限值,根據(jù)計算分析結果,得出在施工過程中,必須嚴格控制人為過失和不設剪刀撐的發(fā)生。
[Abstract]:This paper takes the template bracket during construction as the research object, through the analysis and research, completes the following work, draws the following conclusions: (1) collecting and sorting out the collapse accidents of the template supports in China in the past 12 years, from the types of supports, the height of the scaffolds, the stage of collapse, the types of permanent structures that have been destroyed, the extent of casualties and the causes of the collapse. This paper makes statistical analysis, summarizes the characteristics of the accident, analyzes the internal cause, the external cause and the management reason, and summarizes the root cause of the frequent collapse of the formwork support in our country. (2) A new approximate formula of sensitivity factor is proposed for the case that the function function is implicit or complex, and the feasibility of the formula is verified. The sensitivity analysis of the random variables affecting the ultimate bearing capacity of the formwork support is made. According to the calculation results, the step distance, the wall thickness of the steel pipe, the tightening and torsion moment, the length of the vertical rod over the top horizontal bar are regarded as the random variables which have great influence on the reliability. At the same time, the randomness of the horizontal distance between the poles is ignored. (4) calculate the ultimate bearing capacity of the large formwork bracket under different working conditions, and fit the ultimate bearing capacity of the formwork bracket, determine the probability model of resistance, and obtain the probability model of load by reference. The limit state equation of the template bracket was established and the reliability of the support was calculated by Monte Carlo method. 5) calculate the reliability in the case of human fault, no-one fault and no scissors support. According to the requirements of the target reliability index, the upper limit value of the probability of occurrence of human negligence is back calculated. According to the results of calculation and analysis, it is concluded that in the construction process, the occurrence of human error and no scissors bracing must be strictly controlled.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU755.2

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