本文選題：內(nèi)配加勁件的鋼管混凝土　切入點：抗彎承載力　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：內(nèi)配加勁件的鋼管混凝土不僅具有承載力高、剛度大、延性好等特點,又可克服普通鋼管混凝土壁厚過厚、抗火性能差等缺點,已經(jīng)逐漸在工程中開始運用。而其作為一種新型復(fù)合構(gòu)件,工作機理較為復(fù)雜,力學(xué)性能、連接構(gòu)造等都沒有展開系統(tǒng)的研究。本文以內(nèi)配鋼管、內(nèi)配鋼筋和內(nèi)配型鋼的鋼管混凝土作為研究對象,對抗彎承載力、復(fù)雜應(yīng)力下的相關(guān)關(guān)系及其在抗拉作用下內(nèi)外鋼構(gòu)件共同工作的性能進行了探討,以期取得形式簡潔且取值科學(xué)的承載力設(shè)計值。研究極限狀態(tài)下的抗彎承載力。本文通過求解純彎作用下構(gòu)件達到極限狀態(tài)的平衡方程,討論中性軸的位置情況,將中性軸位置代入彎矩平衡方程,取得了內(nèi)配加勁件鋼管混凝土的極限抗彎承載力理論值。同時利用有限元軟件ABAQUS建立純彎作用下的抗彎模型,驗證理論解的準確性。并將理論值、有限元值對協(xié)會標準提出的特殊鋼管混凝土抗彎承載力規(guī)范值進行校驗和修正。后通過3組18根內(nèi)配加勁件鋼管混凝土純彎試驗對校驗修正后的規(guī)范值進行驗證。研究復(fù)雜應(yīng)力下的相關(guān)方程�；跇O限平衡理論,將內(nèi)配加勁件的鋼管混凝土看作外鋼管、內(nèi)鋼管、混凝土三種元件構(gòu)成的結(jié)構(gòu),先不考慮三者的相互作用,求解壓、彎、剪、扭作用下的平衡方程,將內(nèi)配加勁構(gòu)件的鋼管混凝土模型等效為一個由等效壓桿、混凝土斜腹桿和鋼材拉桿組成的空間桁架模型,消去內(nèi)力項,驗證內(nèi)配加勁件鋼管混凝土的相關(guān)方程的理論形式。后通過有限元模擬,校驗規(guī)范給出的相關(guān)方程。研究內(nèi)外構(gòu)件非均勻全截面受拉時的共同工作性能。首先進行受拉和受壓情況下內(nèi)外鋼管粘結(jié)試驗,得到極限粘結(jié)應(yīng)力及其影響因素,明確破壞機理和過程;根據(jù)已有的鋼筋和型鋼與混凝土之間的粘結(jié)力理論,考慮內(nèi)部加勁件和混凝土之間的粘結(jié)作用,初步得到非均勻全截面受拉承載力設(shè)計值;進而初步設(shè)計內(nèi)配加勁件的格構(gòu)式鋼管混凝土塔架試驗和內(nèi)外鋼構(gòu)件的連接方式,并對試驗進行有限元模擬,分析和比較內(nèi)配筋和內(nèi)配型鋼方案共同工作能力的差異。
[Abstract]:The concrete-filled steel tube (CFST) with internal stiffener not only has the characteristics of high bearing capacity, high stiffness and good ductility, but also can overcome the shortcomings of ordinary concrete-filled steel tube (CFST), such as overthick wall thickness, poor fire resistance and so on. It has been gradually used in engineering. As a new type of composite component, its working mechanism is more complex, mechanical properties, connection structure and so on have not been systematically studied. Concrete filled steel tube (CFST) with internal steel bar and steel section is the object of study. The relationship between bending bearing capacity and complex stress, and the performance of internal and external steel members working together under the action of tension are discussed. In order to obtain the design value of bearing capacity with simple form and scientific value, the bending bearing capacity under the limit state is studied. In this paper, the position of neutral axis is discussed by solving the equilibrium equation of the ultimate state of the member under pure bending. The position of neutral axis is substituted into the moment equilibrium equation, and the theoretical value of ultimate flexural bearing capacity of concrete-filled steel tube with internal stiffener is obtained. At the same time, the bending model under pure bending is established by using the finite element software ABAQUS. Verify the accuracy of the theoretical solution. The finite element value is used to check and revise the concrete filled steel tube concrete filled steel tube (CFST) flexural bearing capacity, which is put forward by the association standard, and the revised code value is verified by 3 groups of 18 concrete filled steel tube concrete filled steel tube pure bending tests. To study the equation of complex stress, based on the limit equilibrium theory, The concrete-filled steel tube with internal stiffener is regarded as a structure composed of three kinds of elements: outer steel tube, inner steel tube and concrete, and the equilibrium equation under the action of compression, bending, shear and torsion is obtained without considering the interaction of the three elements. The concrete filled steel tube model with internal stiffening members is equivalent to a space truss model composed of equivalent compression bar, concrete inclined web bar and steel tension bar, and the internal force term is eliminated. To verify the theoretical form of the relevant equations of concrete-filled steel tube with internal stiffener. The relevant equations given in the calibration code. The common working performance of the non-uniform full section of internal and external members under tension is studied. First, the bonding tests of internal and external steel tubes under tension and compression are carried out, and the ultimate bond stress and its influencing factors are obtained. According to the existing theory of bond force between steel bar and section steel and concrete, considering the bond effect between internal stiffener and concrete, the design value of tensile bearing capacity of non-uniform full section is obtained preliminarily. Furthermore, the test of concrete filled steel tubular tower with internal stiffener and the connection mode of internal and external steel members are preliminarily designed, and the finite element simulation of the test is carried out, and the difference of the common working ability between the internal reinforcement and the inner section steel is analyzed and compared.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU398.9

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本文編號：1571007