本文關(guān)鍵詞：塔機結(jié)構(gòu)非線性分析及高強度板承載能力研究　出處：《太原科技大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 非線性 風載荷 高強度 臨界載荷

【摘要】：塔式起重機憑借起升高度高、回轉(zhuǎn)半徑大,安裝拆卸方便的特點,在建筑行業(yè)得到廣泛應用,己成為建筑行業(yè)中常用的施工設備。由于塔式起重機這種高聳結(jié)構(gòu)在室外工作運行,隨著塔身高度逐漸增加,風載荷的影響越發(fā)復雜,風壓高度變化系數(shù)隨地面高度變化呈指數(shù)分布變化規(guī)律,結(jié)構(gòu)非線性變形也越發(fā)明顯,這種影響不同程度地體現(xiàn)于工作狀態(tài)及非工作狀態(tài)下的塔機,主要體現(xiàn)于非工作狀態(tài)下的塔機。鑒于以上背景,本文考慮到風載荷對高聳結(jié)構(gòu)的非線性變形,按照風載荷隨塔身高度增大的變化規(guī)律,區(qū)別于將風載荷簡化為一定間距內(nèi)的均布載荷的傳統(tǒng)計算方法,將其等效為從塔身頂部至底部逐漸減小的梯形非均布荷載,推導非均布風載荷下塔機塔身頂端水平位移非線性計算公式;利用有限元分析方法完成了TC5613塔式起重機在非工作狀態(tài)下三種不同支撐形式時的塔式起重機整體分析,分別研究了線性和非線性對塔身靜強度和靜剛度的影響,校核其靜剛度以及塔機靜強度,在此基礎上,考慮了幾何非線性因素,分析了不同工況下塔機靜強度以及靜位移。并與給出的理論公式計算值進行對比分析,得出結(jié)論:幾何非線性是影響塔機靜強度值的主要因素;并伴隨著塔身高度的增加越發(fā)突出。目前高強度板起重機上的應用方面處于初期,針對高強度板受壓屈曲穩(wěn)定性的研究尚無新的計算理論和計算方法。雖然高強度鋼材的相關(guān)設計理論在《鋼結(jié)構(gòu)設計規(guī)范》中有所提及,但還沒有相應的實驗和數(shù)據(jù)分析研究做支撐,大多研究停留在普通強度板的受壓穩(wěn)定性,高強度板的受壓穩(wěn)定性還屬于空白領(lǐng)域亟待通過大量模擬數(shù)據(jù)為研究提供數(shù)據(jù)支撐。因此,本文對四種不同屈服強度、不同板厚、不同筋條尺寸的四邊簡支高強度薄板進行有限元分析,探究其屈曲臨界載荷變化情況與薄板寬厚比、筋條尺寸的關(guān)系。論文最后對研究結(jié)論進行了總結(jié),并指出了當前研究工作的不足之處以及下一步研究工作的方向及預期達到的效果。
[Abstract]:Tower crane is widely used in the construction industry because of its high lifting height, large radius of rotation and convenient installation and disassembly. Tower crane has become a common construction equipment in the construction industry. With the tower height increasing, the influence of wind load becomes more and more complex because of the tower crane which works outdoors. The coefficient of variation of wind pressure height varies exponentially with the change of ground height, and the nonlinear deformation of the structure becomes more and more obvious, which is reflected in the tower crane under the working state and the non-working state to varying degrees. In view of the above background, considering the nonlinear deformation of the wind load to the towering structure, according to the law of the wind load increasing with the tower height. It is different from the traditional calculation method which simplifies the wind load to the uniform load within a certain distance, which is equivalent to the trapezoidal non-uniform load which gradually decreases from the top to the bottom of the tower. The nonlinear calculation formula of horizontal displacement at the top of tower body of tower crane under non-uniform wind load is derived. Using the finite element analysis method, the whole analysis of tower crane with TC5613 tower crane under three different support forms under non-working condition is completed. The effects of linearity and nonlinearity on the static strength and stiffness of the tower are studied, and the static stiffness and the static strength of the tower crane are checked. On this basis, the geometric nonlinear factors are considered. The static strength and displacement of tower crane under different working conditions are analyzed and compared with the calculated values of theoretical formula. It is concluded that geometric nonlinearity is the main factor affecting the static strength of tower crane; With the increase of tower height, the application of high strength plate crane is in the initial stage. There is no new calculation theory and calculation method for the buckling stability of high strength plates under compression, although the related design theory of high strength steel is mentioned in the Code for Design of Steel structures. However, there is no corresponding experimental and data analysis research to support, most of the research stay on the compressive stability of the ordinary strength plate. The compressive stability of high strength plate is also a blank field, which needs to be supported by a large number of simulation data. Therefore, this paper studies four different yield strength, different plate thickness. The finite element analysis is carried out on the four sides simply supported high strength thin plates with different sizes of bars, and the relationship between the buckling critical load and the ratio of width to thickness of thin plates and the size of steel bars is explored. Finally, the conclusions of the research are summarized. It also points out the shortcomings of the current research work, the direction of the next research work and the expected results.
【學位授予單位】：太原科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH213.3

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