【摘要】：碗扣式模板支架體系是工程施工中的一種臨時(shí)結(jié)構(gòu),具有復(fù)雜性、變化性、隨機(jī)性和難控性等特點(diǎn)。近年來(lái),與模板支架坍塌的相關(guān)安全事故在施工項(xiàng)目安全事故發(fā)生總頻次中占有很大比例。因此,如何保證碗扣式模板支架體系的整體穩(wěn)定性已成為目前重點(diǎn)關(guān)注的課題之一。本文在已有研究的基礎(chǔ)上,利用有限元軟件ANSYS建立碗扣式模板支架有限元模型,對(duì)模板支架整體穩(wěn)定性及其影響影響因素進(jìn)一步分析和探討,主要得出以下幾點(diǎn)結(jié)論:(1)將模板支架簡(jiǎn)化為有多個(gè)彈簧支座的多節(jié)間連續(xù)壓桿的計(jì)算簡(jiǎn)圖來(lái)計(jì)算其穩(wěn)定承載力是合理的,考慮到剪刀撐、掃地桿高度和立桿伸出頂層水平桿長(zhǎng)度、架體高度等因素對(duì)支架穩(wěn)定承載力的影響,對(duì)該理論的計(jì)算公式進(jìn)行修正。(2)連續(xù)壓桿理論中的彈簧剛度k的取值取決于立桿與水平桿連接處的碗扣節(jié)點(diǎn)的結(jié)構(gòu)特性和材料特性兩個(gè)方面,偏于安全,取二者中的較小值;(3)建立支架半剛性有限元模型分析支架穩(wěn)定承載力的影響因素,得出:支架承載力隨著掃地桿高度和立桿伸出頂層水平桿長(zhǎng)度的增大而減小;在架體較弱方向的節(jié)點(diǎn)施加假想水平力來(lái)模擬初始缺陷是合理的;減小步距更能提高支架的承載力,并且進(jìn)一步提出了立桿計(jì)算長(zhǎng)度修正系數(shù);立桿底端支座脫空對(duì)支架承載力的影響程度:拐角立桿最大,邊部立桿其次,中間最小。(4)通過(guò)15種工況的支架有限元模型分析了剪刀撐的斜桿配置率xa與支架穩(wěn)定承載力crP之間的關(guān)系,當(dāng)架體構(gòu)架參數(shù)相同時(shí),剪刀撐的作用是隨著斜桿配置率和其搭設(shè)方式而變化的,只有當(dāng)剪刀撐科學(xué)搭設(shè)時(shí),支架穩(wěn)定承載力才隨著斜桿配置率的增大而增大。
[Abstract]:The bowl-button formwork support system is a kind of temporary structure in the engineering construction, which has the characteristics of complexity, variety, randomness and difficulty to control and so on. In recent years, the safety accidents related to the collapse of formwork support occupy a large proportion of the total frequency of safety accidents in construction projects. Therefore, how to ensure the overall stability of the bowl fastener has become one of the most important issues. On the basis of the existing research, the finite element model of the bowl-button formwork bracket is established by using the finite element software ANSYS, and the overall stability of the template bracket and its influencing factors are further analyzed and discussed. The main conclusions are as follows: (1) it is reasonable to simplify the template support to the calculation diagram of the continuous pressure bar with multiple spring supports to calculate its stable bearing capacity, considering the shear braces, The influence of the height of floor sweeping rod, the length of horizontal pole extending out of the top floor and the height of frame body on the stable bearing capacity of the support, The calculation formula of this theory is modified. (2) the value of spring stiffness k in the theory of continuous compression rod depends on the structural characteristics and material characteristics of the bowl-buckle joint at the connection between the vertical bar and the horizontal bar, and is more safety. (3) establishing semi-rigid finite element model to analyze the influence factors of the support stability bearing capacity. It is concluded that the support bearing capacity decreases with the increase of the height of the floor sweeping rod and the length of the horizontal bar extending out of the top floor of the vertical pole. It is reasonable to apply hypothetical horizontal force to simulate the initial defect at the node in the weaker direction of the frame, and to reduce the step distance can improve the bearing capacity of the support, and further put forward the calculation length correction coefficient of the vertical rod. The degree of influence on the bearing capacity of the support is as follows: the corner shaft is the biggest, the side shaft is the second, (4) through the finite element model of 15 kinds of working conditions, the relationship between xa and crP is analyzed. When the frame parameters are the same, The effect of shear-brace varies with the collocation rate of skew rod and its setting mode. Only when the shear-bracing is scientifically installed, the stable bearing capacity of the support increases with the increase of the collocation rate of the skew rod.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU731.2

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