【摘要】：隨著我國經濟的快速發(fā)展,城市建設及公共基礎設施的建設進入了一個高峰期,結構向著更高、跨度更大的方向發(fā)展;為施工提供支承或操作平臺的腳手架的搭設要求也會向著高度更高、跨度更大的方向發(fā)展。目前,盡管腳手架類型很多,可以說是應有盡有,然而工程安全事故卻頻頻發(fā)生,尤其是腳手架承載體系倒塌事故最為常見。因此,尋求一種更為合理、安全、經濟的腳手架承載體系成為大眾呼聲。本文介紹了采用古代木結構中最常見的榫卯連接的新型腳手架承載體系(榫卯式滿堂支承體系)。榫卯式腳手架目前在國內還沒有工程應用實例,也沒有相關的試驗研究,但是其結構體系施工操作速度快、周轉壽命長、適用性強、整體剛度大、承載力高等優(yōu)點使其具有廣泛的應用價值,為了推廣應用就需要相關整體試驗及局部試驗。針對該榫卯式滿堂支承體系的承載性能,本文主要完成了以下幾個方面的工作:(1)完成了11套高度超過8m的榫卯式滿堂支承體系的豎向承載能力試驗,研究了立桿間距、橫桿步距、剪刀撐對承載能力的影響。(2)分析了各測點位移隨荷載的變化規(guī)律,據此說明了榫卯支撐體系整體失穩(wěn)的模式并利用了位移變化規(guī)律確定了有限元整體計算模型邊界條件。(3)采用節(jié)點半剛性理論建立了11套架體的有限元模型,應用非線性后屈曲分析手段獲得了試驗架體各測點荷載—位移曲線并確定了體系豎向極限承載力;與試驗結果對比,發(fā)現有限元模擬結果和試驗結果基本吻合,從而驗證了有限元模型的合理性及適用性。(4)對榫卯式節(jié)點的可靠性做了試驗研究,包括節(jié)點半剛性試驗、節(jié)點抗剪試驗、節(jié)點彎剪試驗、節(jié)點抗拉試驗,試驗結果都驗證了榫卯式節(jié)點的合理性及連接的可靠性。(5)建立了考慮面間正向作用及切向作用(接觸分析)的三維實體模型,這種模型能夠精確反映節(jié)點的實際工作狀態(tài);模擬結果和試驗規(guī)律一致,更進一步驗證了這種榫卯式新型節(jié)點的合理性及連接的可靠性。以上幾個方面的研究包括試驗研究及有限元分析,由此得出的相關結論既可指導該支撐體系的企業(yè)或者行業(yè)規(guī)范的編寫又可指導該新型支撐體系在工程中的應用。
[Abstract]:With the rapid development of our economy, the construction of urban construction and public infrastructure has entered a peak period, and the structure is developing in the direction of higher and larger span. Scaffolding, which provides support or operating platform for construction, will also develop towards higher height and larger span. At present, although there are many types of scaffolding, it can be said that there are all kinds of scaffolding, but engineering safety accidents occur frequently, especially the collapse of scaffolding bearing system is the most common. Therefore, the search for a more reasonable, safe, economic scaffolding carrying system has become the voice of the public. In this paper, a new type of scaffold bearing system (mortise and tenon full support system) with tenon and joint is introduced. Tenon and mortise scaffolding has not been applied in China, nor has it been tested. However, the structure system has the advantages of fast construction operation speed, long turnover life, strong applicability and large overall stiffness. Because of its high bearing capacity, it has wide application value. In order to popularize its application, it needs relevant whole test and local test. In view of the bearing capacity of the tenon and mortise full hall support system, this paper mainly completes the following aspects: (1) the vertical bearing capacity tests of 11 tenon and tenon full support systems with height over 8 m have been completed, and the vertical stand spacing has been studied. The influence of walking distance and scissors bracing on the bearing capacity is analyzed. (2) the variation of displacement with load at each measuring point is analyzed. According to this, the mode of the whole instability of the tenon and joint bracing system is explained, and the boundary conditions of the finite element integral calculation model are determined by using the law of displacement. (3) the finite element model of 11 sets of frames is established by using the theory of joint semi-rigidity. By means of nonlinear post-buckling analysis, the load-displacement curves of each measuring point of the test frame are obtained and the vertical ultimate bearing capacity of the system is determined. Compared with the test results, it is found that the finite element simulation results are in good agreement with the test results, which verifies the rationality and applicability of the finite element model. (4) the reliability of the tenon joint is studied experimentally, including the semi-rigid joint test. Joint shear test, joint bending shear test, joint tensile test, The test results verify the rationality of the joint and the reliability of the connection. (5) A three-dimensional solid model considering the forward and tangential interaction between planes (contact analysis) is established. This model can accurately reflect the actual working state of nodes. The simulation results are consistent with the experimental results, which further verify the rationality and reliability of the new joint. The above studies include experimental research and finite element analysis. The conclusions can be used to guide the enterprise or industry specification of the support system as well as the application of the new support system in engineering.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU366.2;TU731.2

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本文編號：2403495