本文選題：大跨度空間結(jié)構(gòu)　切入點(diǎn)：鋼結(jié)構(gòu)　出處：《天津大學(xué)》2014年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著我國(guó)綜合國(guó)力的提高和經(jīng)濟(jì)的發(fā)展,建筑形式呈現(xiàn)出多樣化的發(fā)展趨勢(shì)�，F(xiàn)代鋼結(jié)構(gòu)正朝著高、大、復(fù)的方向發(fā)展,復(fù)雜鋼結(jié)構(gòu)的大跨、高層建筑愈來(lái)愈多,它們?cè)谑┕み^(guò)程中的力學(xué)問(wèn)題也越來(lái)越受到廣泛的關(guān)注。針對(duì)弦支穹頂疊合拱結(jié)構(gòu),就預(yù)應(yīng)力張拉過(guò)程中空間鋼拱是否與下部網(wǎng)殼結(jié)構(gòu)協(xié)同受力,制定了兩種施工方案。對(duì)此兩種施工方案,分別進(jìn)行了弦支穹項(xiàng)疊合拱結(jié)構(gòu)施工全過(guò)程分析,對(duì)預(yù)應(yīng)力張拉施工過(guò)程中索力、桿件內(nèi)力和結(jié)構(gòu)變形進(jìn)行了全過(guò)程分析。為滿(mǎn)足預(yù)應(yīng)力施工過(guò)程的需要、保證工程順利進(jìn)行,對(duì)結(jié)構(gòu)進(jìn)行施工監(jiān)測(cè),從監(jiān)測(cè)結(jié)果來(lái)看,實(shí)測(cè)結(jié)果很好地驗(yàn)證了理論計(jì)算結(jié)果,同時(shí)說(shuō)明了通過(guò)有限元計(jì)算軟件進(jìn)行施工仿真計(jì)算的可行性。對(duì)大跨度大懸挑吊掛結(jié)構(gòu)施工過(guò)程中的關(guān)鍵技術(shù)問(wèn)題進(jìn)行研究,并進(jìn)行了施工過(guò)程力學(xué)模擬分析。針對(duì)本工程的結(jié)構(gòu)特點(diǎn),確定了臨時(shí)支撐的設(shè)置原則和卸載方案,采用等效桿端位移法進(jìn)行臨時(shí)支撐的卸載數(shù)值模擬。對(duì)大懸挑結(jié)構(gòu)卸載進(jìn)行了數(shù)值模擬及施工監(jiān)測(cè)。針對(duì)鋼框架-支撐與空間交叉桁架復(fù)合結(jié)構(gòu)施工中的重點(diǎn)難點(diǎn),對(duì)結(jié)構(gòu)施工變形控制措施及結(jié)構(gòu)整體卸載進(jìn)行了施工過(guò)程有限元分析模擬,考察荷載轉(zhuǎn)換過(guò)程中結(jié)構(gòu)的強(qiáng)度與剛度變化,為施工方案的確定提供理論支持,保證施工過(guò)程的順利進(jìn)行。采用電阻應(yīng)變片靜態(tài)有線(xiàn)應(yīng)力監(jiān)測(cè)、電阻應(yīng)變片靜態(tài)無(wú)線(xiàn)應(yīng)力監(jiān)測(cè)和鋼弦式應(yīng)變傳感器應(yīng)力監(jiān)測(cè)三種監(jiān)測(cè)手段,對(duì)天津圖書(shū)館鋼框架-支撐與空間交叉桁架復(fù)合結(jié)構(gòu)關(guān)鍵節(jié)點(diǎn)的應(yīng)力狀態(tài)進(jìn)行施工全過(guò)程監(jiān)測(cè)。三種手段監(jiān)測(cè)結(jié)果相互對(duì)照,可以及時(shí)發(fā)現(xiàn)問(wèn)題,保證了監(jiān)測(cè)結(jié)果的準(zhǔn)確性和有效性,以及現(xiàn)場(chǎng)施工的順利進(jìn)行。將向心關(guān)節(jié)軸承引入弦支穹頂結(jié)構(gòu)的撐桿上節(jié)點(diǎn),形成了向心關(guān)節(jié)撐桿上節(jié)點(diǎn),配合不可滑動(dòng)撐桿下節(jié)點(diǎn)以及撐桿形成了向心關(guān)節(jié)索桿體系。選取工程實(shí)際向心關(guān)節(jié)軸承撐桿上節(jié)點(diǎn)進(jìn)行了足尺試驗(yàn),并進(jìn)行了有限元模擬。提出了基于非線(xiàn)性有限元技術(shù)的反分析方法,分析了向心關(guān)節(jié)索桿體系弦支穹頂結(jié)構(gòu)的施工張拉過(guò)程,確定了其施工放樣狀態(tài)。對(duì)向心關(guān)節(jié)索桿體系弦支穹頂結(jié)構(gòu)張拉過(guò)程進(jìn)行施工監(jiān)測(cè),通過(guò)監(jiān)測(cè)各張拉階段上部結(jié)構(gòu)位移、支座位移,確保張拉過(guò)程中結(jié)構(gòu)安全可靠,同時(shí)驗(yàn)證了施工張拉數(shù)值模擬方法的可行性。對(duì)切割加長(zhǎng)大跨度結(jié)構(gòu)滑移施工技術(shù)的總體思路和實(shí)際關(guān)鍵控制點(diǎn)進(jìn)行了研究,通過(guò)對(duì)腹桿加強(qiáng)、支撐架搭設(shè)、滑移頂推點(diǎn)設(shè)計(jì)、滑移過(guò)程中的同步控制等技術(shù)措施進(jìn)行研究,保證了工程的順利實(shí)施。為了評(píng)定其滑移過(guò)程中桁架結(jié)構(gòu)的安全性,使結(jié)構(gòu)在滑移過(guò)程中保持同步且不因應(yīng)力過(guò)大產(chǎn)生過(guò)大的變形,實(shí)現(xiàn)桁架整體滑移施工,并且滿(mǎn)足其后續(xù)施工和使用的要求,對(duì)該桁架結(jié)構(gòu)整體滑移過(guò)程中的部分關(guān)鍵桿件應(yīng)力應(yīng)變進(jìn)行了現(xiàn)場(chǎng)監(jiān)測(cè)。針對(duì)以上幾種不同形式的大跨度空間鋼結(jié)構(gòu),根據(jù)其結(jié)構(gòu)受力特點(diǎn)、結(jié)構(gòu)布置形式和現(xiàn)場(chǎng)工作條件等因素,確定相應(yīng)的測(cè)點(diǎn)布設(shè)方式,力爭(zhēng)達(dá)到“監(jiān)測(cè)完整、性能穩(wěn)定兼顧性?xún)r(jià)比最優(yōu)”的布設(shè)原則,為今后相關(guān)結(jié)構(gòu)工程的施工監(jiān)測(cè)方案確定提供參考和理論依據(jù)。
[Abstract]:With the rapid development of China's comprehensive national strength and economic construction form, showing a diversified trend. Modern steel structure is a high, large, complex direction, complex steel structure of large span, more and more high-rise buildings, they are in the process of construction of the mechanical problems are more and more attention. Aiming at suspend dome with stacked arch structure, spatial prestressing process of steel arch and the lower shell structure is synergy force, made two kinds of construction schemes. This two kinds of construction schemes, were a suspen dome with stacked arch structure to analyze the whole process of construction, the cable force in the construction process of prestressed tension bar deformation, internal force and structure are discussed. In order to meet the needs of the prestressed construction process, ensure the smooth progress of the project, the construction monitoring of the structure, from the monitoring results, the measured results are in good agreement with the theory. The results, and explain the feasibility of construction simulation calculation by FEM software. The large-span suspended key technical problems in the construction process of the pick hanging structure is studied, and the simulation analysis of construction process mechanics. According to the structure characteristics of this project, the establishment principle and the unloading plan determined the temporary support. Numerical simulation of unloading the equivalent rod end displacement method for temporary support. The large cantilever structure of unloading numerical simulation and construction monitoring. On the construction of steel braced frame and space truss composite structure to cross point, construction of a finite element analysis simulation of deformation control measures and the whole body of the structure construction study of load conversion process, the structural strength and stiffness changes, provide theoretical support for the determination of construction scheme, to ensure the smooth progress of the construction process. Using electric resistance Static strain gauge cable stress monitoring, resistance strain gauge static wireless stress monitoring steel wire strain sensor and stress monitoring of the three monitoring methods, the whole process of construction monitoring of Tianjin Library of steel braced frame and space truss composite structure cross key nodes stress state. The three means of monitoring results of mutual control. You can find the problem in time, to ensure the accuracy of monitoring results and effectiveness, and smooth progress of the construction site. The introduction of sphericalplain bearing supporting nodes of suspendome structure, form a centripetal joint strut node, with sliding strut joint and struts formed a centripetal joint cable strut system is selected from the project. The actual sphericalplain bearing supporting nodes are test and finite element simulation. The back analysis method of nonlinear finite element technique based on the analysis of the heart Cable strut joint suspendome construction process of tension structure, the construction lofting state is determined. The sphericalplain cable strut system suspendome tensioning construction process monitoring, through the monitoring of the tension displacement of superstructure phase displacement, ensure the tensioning process is safe and reliable, and verification the tension of the numerical simulation method. The feasibility of the general idea of cutting construction technology span structure and the actual slip up the critical control points were studied, through the strengthening of the brace, support frame erection, sliding pushing point design, research technical measures in the process of synchronous sliding control, to ensure the smooth the implementation of the project. In order to assess the safety of the truss structure during sliding, the structure to keep pace and not due to excessive stress resulting from the deformation in the sliding process, the realization of the overall truss sliding construction, and Meet the following construction and use requirements, the whole sliding the truss structure parts in the process of the key elements of stress and strain of field monitoring. The large span steel structure for the above several different forms, according to the stress characteristics of the structure, structure and working conditions and other factors, determine the layout of measuring point accordingly, and strive to achieve a complete monitoring, the layout principle of stable performance, taking into account the cost optimal to provide reference and theoretical basis for future structural engineering construction monitoring scheme is determined.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU758.11

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