本文選題：扣件式高大模板支撐體系 + 節(jié)點半剛性�。� 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：隨著社會經(jīng)濟(jì)的快速發(fā)展,高大模板支撐體系越來越多地應(yīng)用于大空間、大跨度結(jié)構(gòu)的施工過程。但由于高大模板支撐體系屬于臨時承載體系,傳力路徑和計算模型復(fù)雜,而且影響因素較多,一旦其穩(wěn)定性不能得到保障,往往導(dǎo)致施工中的建筑工程發(fā)生坍塌,造成巨大的人員傷亡和財產(chǎn)損失。因此,針對高大模板支撐體系的受力特點,圍繞高大模板支撐體系的分析模型和穩(wěn)定承載力分析開展研究,對于高大模板支撐體系的設(shè)計與安全評估具有重要意義。本文根據(jù)高大模板支撐體系的受力特點,綜合考慮節(jié)點半剛性連接特性與二階效應(yīng)的影響,建立了高大模板支撐體系的分析模型,進(jìn)而對其穩(wěn)定承載力與構(gòu)造措施進(jìn)行了系統(tǒng)分析,主要研究內(nèi)容包括：1、基于理論分析,推導(dǎo)了考慮節(jié)點半剛性連接特性與二階效應(yīng)的水平桿單元以及考慮二階效應(yīng)的立桿單元的剛度矩陣,在此基礎(chǔ)上建立了高大模板支撐體系的有限元分析模型,進(jìn)而對高大模板支撐體系的內(nèi)力與位移進(jìn)行了分析。分析結(jié)果表明,節(jié)點半剛性連接特性和二階效應(yīng)的耦合作用,對高大模板支撐體系的內(nèi)力重分布與節(jié)點側(cè)移具有顯著影響。2、綜合考慮節(jié)點半剛性連接特性與二階效應(yīng)的影響,建立了高大模板支撐體系的穩(wěn)定剛度方程,基于特征值屈曲分析對高大模板支撐體系進(jìn)行了穩(wěn)定承載力分析,并定量分析了節(jié)點半剛性的初始轉(zhuǎn)動剛度與剪刀撐的設(shè)置對高大模板支撐體系穩(wěn)定承載力的影響規(guī)律。分析結(jié)果表明,節(jié)點半剛性的初始轉(zhuǎn)動剛度對高大模板支撐體系的穩(wěn)定承載力具有顯著影響,而設(shè)置剪刀撐可以顯著提高高大模板支撐體系的穩(wěn)定承載力。3、基于高大模板支撐體系的分析模型,定量分析了水平桿步距、立桿間距、掃地桿高度、立桿伸出掃天桿長度及剪刀撐等構(gòu)造措施對高大模板支撐體系穩(wěn)定承載力的影響,并對國家規(guī)范《建筑施工扣件式鋼管腳手架安全技術(shù)規(guī)范》(JGJ130-2011)和廣西地方標(biāo)準(zhǔn)《建筑施工模板及作業(yè)平臺鋼管支架構(gòu)造安全技術(shù)規(guī)范》(DB45/T618-2009)中的相關(guān)構(gòu)造措施進(jìn)行了分析和校準(zhǔn)。最后基于定量分析結(jié)果,給出各種構(gòu)造措施的合理建議。
[Abstract]:With the rapid development of social economy, tall formwork support system is more and more used in the construction process of large space and long span structure. However, because the large formwork support system belongs to the temporary bearing system, the load transfer path and the calculation model are complex, and there are many influencing factors. Once its stability can not be guaranteed, it often leads to the collapse of the construction project in construction. Causing huge casualties and property damage. Therefore, according to the stress characteristics of tall formwork bracing system, the research on the analysis model and stability bearing capacity of tall formwork bracing system is of great significance for the design and safety evaluation of tall formwork bracing system. According to the mechanical characteristics of tall formwork bracing system and considering the influence of semi-rigid connection characteristics and second-order effect, the analysis model of tall formwork bracing system is established in this paper. Furthermore, the stability bearing capacity and structural measures are systematically analyzed. The main research contents include: 1, based on theoretical analysis, The stiffness matrix of the horizontal bar element considering the semi-rigid connection characteristic and the second-order effect of the node and the standing bar element with the second-order effect are derived, and the finite element analysis model of the tall formwork bracing system is established. Then the internal force and displacement of tall formwork bracing system are analyzed. The results show that the coupling effect of the semi-rigid connection and the second-order effect has a significant effect on the internal force redistribution and the lateral displacement of the large formwork bracing system. The effects of the semi-rigid connection characteristics and the second-order effect are considered comprehensively. The stability stiffness equation of tall formwork bracing system is established, and the stability bearing capacity of tall formwork bracing system is analyzed based on eigenvalue buckling analysis. The influence of the initial rotational stiffness of semi-rigid joints and the setting of scissors brace on the stability bearing capacity of tall formwork bracing system is analyzed quantitatively. The results show that the initial rotational stiffness of semi-rigid joints has a significant effect on the stability bearing capacity of tall formwork bracing system. The stable bearing capacity of tall formwork bracing system can be improved significantly by setting scissors brace. Based on the analysis model of tall formwork support system, the horizontal pole step distance, standing pole spacing and floor sweeping bar height are quantitatively analyzed. The influence of the structural measures such as the length of the vertical pole and the scissors brace on the stable bearing capacity of the tall formwork bracing system, This paper also analyzes and calibrates the relevant construction measures in the national code "Safety Technical Code for Steel Tube scaffolding of fastener Type of Building Construction" (JGJ130-2011) and the "Technical Code for Safety of Steel Pipe support structure of Building Construction template and working platform" in Guangxi Local Standard "DDB45 / T618-2009". Finally, based on the results of quantitative analysis, reasonable suggestions of various construction measures are given.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU755.2
，

本文編號：1939308