發(fā)布時(shí)間：2018-04-23 22:39

  本文選題：超長(zhǎng) + 鋼筋混凝土��； 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：多數(shù)鋼筋混凝土結(jié)構(gòu)處于帶裂縫工作狀態(tài),其中溫度對(duì)超長(zhǎng)高低跨鋼筋混凝土工業(yè)廠房的影響是不容忽視的,當(dāng)結(jié)構(gòu)混凝土因所受內(nèi)力及溫差或收縮應(yīng)力疊加值大于混凝土抗拉強(qiáng)度時(shí)會(huì)導(dǎo)致結(jié)構(gòu)混凝土開裂。本文以南方地區(qū)某多層多跨且長(zhǎng)度為110m的超長(zhǎng)工業(yè)廠房鋼筋混凝土框架結(jié)構(gòu)為工程背景,在對(duì)國內(nèi)外相關(guān)文獻(xiàn)進(jìn)行必要的歸納與總結(jié)的基礎(chǔ)上,首先獲取工程所在地15年的溫度相關(guān)資料并通過數(shù)值分析,研究了該超長(zhǎng)鋼筋混凝土框架結(jié)構(gòu)在多種溫度工況作用下的溫度效應(yīng)及其影響,分析了溫度應(yīng)力的大小范圍及分布規(guī)律；其次推導(dǎo)了單階柱在溫度側(cè)向變形和混凝土收縮變形雙重作用對(duì)柱子長(zhǎng)細(xì)比的影響,研究了溫度側(cè)向變形和混凝土收縮變形等因素對(duì)單階柱計(jì)算長(zhǎng)度系數(shù)的影響,計(jì)算分析本工程單階柱在同時(shí)考慮溫度側(cè)向變形和混凝土收縮變形影響下的計(jì)算長(zhǎng)度系數(shù)。文章得到如下主要結(jié)論：1)在綜合溫差作用下,結(jié)構(gòu)變形以收縮為主,結(jié)構(gòu)的整體位移在0-17.65mm之間,縱向收縮位移達(dá)到11.95mm,豎向收縮變形達(dá)到11.2mm。在離結(jié)構(gòu)底部基礎(chǔ)約束最遠(yuǎn)的塔樓屋面受到的約束作用相對(duì)最弱,故其變形值最大,數(shù)值為17.65mm；所以結(jié)構(gòu)的整體變形隨結(jié)構(gòu)高度的增高呈逐漸增大的趨勢(shì)。2)縱向框架梁的內(nèi)力及框架柱的內(nèi)力與相鄰構(gòu)件(橫向框架梁)對(duì)其的約束情況有關(guān),截面尺寸大的橫向框架梁對(duì)縱向框架梁和柱子的約束作用越強(qiáng),與橫向框架梁同層及相鄰上一層的縱向框架梁的內(nèi)力、橫向框架梁底的柱子的內(nèi)力相應(yīng)越大。3)當(dāng)結(jié)構(gòu)中內(nèi)、外部構(gòu)件降溫或升溫?cái)?shù)值不同時(shí),框架的邊跨梁由于變形不協(xié)調(diào)而產(chǎn)生變形差,此變形差將在邊跨梁內(nèi)引起較大的彎矩。4)通過對(duì)本工程A軸單階柱的計(jì)算長(zhǎng)度系數(shù)進(jìn)行對(duì)比分析可知,在同時(shí)考慮溫度側(cè)向變形和混凝土收縮變形影響下的計(jì)算長(zhǎng)度系數(shù)μ2值的增大率為7.18%,超過了工程設(shè)計(jì)中規(guī)定的允許誤差5%的要求,因此在對(duì)鋼筋混凝土工業(yè)廠房單階柱進(jìn)行穩(wěn)定承載力分析時(shí),不容忽視溫度側(cè)向變形和混凝土收縮變形對(duì)單階柱計(jì)算長(zhǎng)度系數(shù)的不利影響。
[Abstract]:Most reinforced concrete structures are in the state of working with cracks, and the influence of temperature on the industrial building of reinforced concrete with long span and high span can not be ignored. When the superposition value of internal force, temperature difference or shrinkage stress of structural concrete is larger than the tensile strength of concrete, it will lead to the cracking of structural concrete. In this paper, the reinforced concrete frame structure of a multi-story and multi-span industrial factory building with a length of 110m is taken as the engineering background, on the basis of the necessary induction and summary of the relevant literature at home and abroad. Firstly, the temperature effect and its influence of the super-long reinforced concrete frame structure under various temperature conditions are studied by obtaining the temperature related data of the site of the project for 15 years and through numerical analysis. The range and distribution of temperature stress are analyzed. Secondly, the influence of the double action of temperature lateral deformation and concrete shrinkage deformation on the aspect ratio of single column is deduced. The effects of temperature lateral deformation and concrete shrinkage deformation on the calculated length coefficients of single columns are studied. The calculated length coefficients of single columns under the influence of both temperature lateral deformation and concrete shrinkage deformation are calculated and analyzed. The main conclusions are as follows: (1) under the action of comprehensive temperature difference, the deformation of the structure is mainly shrinkage, the whole displacement of the structure is between 0-17.65mm, the longitudinal shrinkage displacement is 11.95 mm, and the vertical shrinkage deformation is 11.2 mm. The roof of the tower with the furthest constraints from the bottom foundation of the structure is subjected to the weakest constraint, so its deformation value is the largest. The internal force of longitudinal frame beam and the internal force of frame column are related to the constraint of adjacent members (transverse frame beam). The larger the cross section size is, the stronger the constraint on the longitudinal frame beam and column is, the stronger the internal force of the longitudinal frame beam on the same floor as the transverse frame beam, and the larger the internal force of the column at the bottom of the transverse frame beam. 3) in the structure, the inner force of the longitudinal frame beam on the same floor as the transverse frame beam and the column at the bottom of the transverse frame beam is larger. The deformation difference of the side span beam of the frame is caused by the incongruity of deformation due to the difference of the temperature drop or the heating value of the external member. This deformation difference will cause a large bending moment. 4) by comparing and analyzing the calculated length coefficient of A axis single column in this project, we can know that, Under the influence of both temperature lateral deformation and concrete shrinkage deformation, the increase rate of the calculated length coefficient 渭 2 is 7.18, which exceeds the allowable error of 5% in engineering design. Therefore, in the analysis of the steady bearing capacity of the single column in the reinforced concrete industrial powerhouse, the adverse effects of temperature lateral deformation and concrete shrinkage deformation on the calculated length coefficient of the single column can not be ignored.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375

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