【摘要】：腳手架作為一種臨時結(jié)構(gòu)，，它的運用已經(jīng)成為建筑行業(yè)不可缺少的一個部分。而在腳手架的眾多種類中，扣件式鋼管腳手架因具有造價低廉、搭設(shè)簡單、對場地要求低、承載力高等優(yōu)勢而處于主導(dǎo)地位。 扣件式鋼管腳手架是一種桿系結(jié)構(gòu)，為缺陷敏感結(jié)構(gòu)體系，而結(jié)構(gòu)所用的鋼管桿件是長期重復(fù)使用的，存在壁厚磨損、初彎曲等累積效應(yīng)。雖然規(guī)范中有規(guī)定，但現(xiàn)實管材重復(fù)使用后的缺陷實測及統(tǒng)計分析很少有報道，尚未形成統(tǒng)一的缺陷分析理論與方法。為確�？奂戒摴苣_手架結(jié)構(gòu)使用安全，開展實測缺陷對結(jié)構(gòu)性能的影響研究具有重要的理論意義和工程應(yīng)用價值。 本文基于故障樹分析法，建立扣件式腳手架的安全事故的故障樹圖，分析引起事故的各個底事件的結(jié)構(gòu)重要度，為預(yù)防事故提供一定的參考價值。根據(jù)在某省注冊登記的建筑施工企業(yè)資質(zhì)等級情況，結(jié)合某市實際情況，按隨機分層抽樣方法，對18個不同資質(zhì)等級企業(yè)的扣件式腳手架工程所用管材，在現(xiàn)場隨機抽測尺寸48mm×3.5mm和48.3mm×3.6mm、長度為6m和3m鋼管的壁厚、外徑、初始彎曲等原始數(shù)據(jù)共2340個，對數(shù)據(jù)樣本進(jìn)行統(tǒng)計分析，運用改進(jìn)型格拉布斯法對數(shù)據(jù)進(jìn)行檢測，剔除異常值，建立了初始缺陷隨機分布規(guī)律和概率函數(shù)參數(shù)的統(tǒng)計信息。在此基礎(chǔ)上，基于有限元理論知識，考慮節(jié)點的半剛性，借助ANSYS軟件，建立扣件式鋼管腳手架的有限元模型。以實測初始缺陷為基礎(chǔ)，運用一致模態(tài)法，以不同的荷載工況（滿跨均布荷載、滿跨不對稱荷載）、不同扣件扭緊力矩（30N·m、40N·m、50N·m）、不同的缺陷（規(guī)范限值3L/1000、實測L/220）等作為參數(shù)，通過分析對結(jié)構(gòu)極限承載力的影響程度，獲得特征點的荷載位移曲線，為腳手架的安全使用提供理論依據(jù)。
[Abstract]:Scaffolding as a temporary structure, its application has become an indispensable part of the construction industry. Among the many kinds of scaffolding, fastener steel tube scaffolding is dominant because of its advantages of low cost, simple installation, low demand for the site and high bearing capacity. The steel tube scaffolding with fastener is a kind of rod structure, which is a defect-sensitive structure system, and the steel tube member used in the structure is reused for a long time, which has the cumulative effects of wall thickness wear and initial bending. Although there are some regulations in the specification, there are few reports on the defect measurement and statistical analysis after repeated use of practical pipes, and a unified theory and method of defect analysis have not yet been formed. In order to ensure the safety of fastener steel tube scaffolding structure, it is of great theoretical significance and engineering application value to study the effect of the measured defects on the structure performance. Based on the fault tree analysis method, the fault tree diagram of the safety accidents of fastener scaffolding is established, and the structural importance of each bottom event caused by the accident is analyzed, which provides a certain reference value for the prevention of accidents. According to the qualification grade of construction enterprises registered in a certain province and the actual situation of a certain city, according to the random stratified sampling method, the pipes used in fastener scaffolding engineering of 18 enterprises with different qualification grades are studied. The size of 48mm 脳 3.5mm and 48.3mm 脳 3.6mm is measured at random in the field, and the wall thickness, outer diameter and initial bending of steel pipe of 6m and 3m are measured at random. The data samples are statistically analyzed, and the data are detected by improved Grubbs method, and the abnormal values are eliminated. The random distribution of initial defects and the statistical information of the parameters of probability function are established. Based on the knowledge of finite element theory and considering the semi-rigidity of joints, the finite element model of fastener steel tube scaffolding is established by means of ANSYS software. Based on the measured initial defect, the uniform mode method is used to take different load conditions (full span uniform load, full span asymmetric load) and different fastener torsion moment (30N mNs 40N mNM / 50N m),) as parameters, such as different defects (code limit value 3L / 1000, measured L / 220), and so on. The load-displacement curve of the characteristic point is obtained by analyzing the influence degree on the ultimate bearing capacity of the structure, which provides the theoretical basis for the safe use of the scaffold.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU731.2

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