本文關(guān)鍵詞： 桁架式鋼骨混凝土梁 抗彎極限承載力計算公式 二次受力有限元分析　出處：《廣西大學》2014年碩士論文　論文類型：學位論文

【摘要】：桁架式鋼骨混凝土梁是將鋼桁架整體焊接嵌入到混凝土中。與實腹式鋼骨混凝土梁相比具有一定的優(yōu)勢。實腹式鋼骨混凝土梁需要在型鋼上布置栓釘來增強鋼骨和混凝土之間的粘結(jié)力,而對于桁架式鋼骨混凝土梁,因為鋼桁架中的弦桿和腹桿增強了鋼骨和混凝土之間的粘結(jié)作用,所以可以不用設(shè)置栓釘。鋼桁架本身能夠承受一定的荷載,因此當工程受到施工條件的限制無法搭設(shè)模板時,可以將模板直接支撐在鋼桁架上,從而解決這一施工問題。本文主要作了以下幾個方面的工作。1.本文通過有限元分析軟件ABAQUS建立桁架式鋼骨混凝土梁一次受力有限元模型。將有限元分析結(jié)果與課題組前期的試驗進行對比以證明模擬的合理性。通過改變斜腹桿與下弦桿面積的比值討論斜腹桿面積對桁架式鋼骨混凝土梁抗彎極限承載力的影響。根據(jù)有限元分析結(jié)果引入腹桿面積增大系數(shù)。將修正后的公式計算結(jié)果與已有試驗數(shù)據(jù)進行對比吻合度良好。2.推導桁架式鋼骨混凝土梁二次受力抗彎極限承載力計算公式,通過所建立的公式討論初始應(yīng)力,配鋼率,配筋率和截面高度對桁架式鋼骨混凝土梁二次受力抗彎極限承載力的影響。計算結(jié)果表明二次受力抗彎極限承載力下降程度與初始應(yīng)力,配鋼率成正比。與配筋率和截面高度成反比。3.應(yīng)用有限元分析軟件ABAQUS中的單元鈍化與激活技術(shù)建立桁架式鋼骨混凝土梁二次受力有限元模型。通過有限元分析結(jié)果驗證上文所建立的桁架式鋼骨混凝土梁二次受力抗彎極限承載力計算公式的正確性。4.通過一個具體的工程示例對桁架式鋼骨混凝土轉(zhuǎn)換梁二次受力問題進行計算分析。
[Abstract]:Truss type steel reinforced concrete beam is a steel truss integral welding embedded in concrete. Compared with the solid web type steel reinforced concrete beam, it has some advantages. The solid web steel reinforced concrete beam needs to be bolted on the section steel to strengthen the steel bone. And the bond between concrete, And for truss steel-reinforced concrete beams, because the chords and webs in the steel truss enhance the bond between the steel and the concrete, you don't have to set a bolt. The steel truss itself can withstand a certain amount of load. Therefore, the formwork can be directly supported on the steel truss when the construction conditions limit the formwork. In order to solve this construction problem, this paper mainly does the following work. 1. The finite element model of truss steel-reinforced concrete beam is established by the finite element analysis software ABAQUS. The results of finite element analysis and the lesson are given. In order to prove the rationality of the simulation, the effect of the area of inclined web bar on the ultimate flexural bearing capacity of truss type steel reinforced concrete beam was discussed by changing the ratio of the area of inclined web bar to the area of lower chord. The results of the analysis are introduced into the increasing coefficient of web area. The calculated results of the modified formula are compared with the existing experimental data. 2. The formula for calculating the ultimate bearing capacity of truss steel-reinforced concrete beams under secondary loading is derived. Through the established formula, the initial stress and steel distribution rate are discussed. The effect of reinforcement ratio and section height on the ultimate bearing capacity of truss steel-reinforced concrete beams under secondary loading is studied. The ratio of steel distribution is directly proportional to the ratio of reinforcement and the height of section. 3. The element passivation and activation technique of finite element analysis software ABAQUS is used to establish the finite element model of truss steel reinforced concrete beam under secondary stress. The correctness of the formula for calculating the ultimate bearing capacity of truss steel-reinforced concrete beams under secondary loading is verified. 4. A concrete engineering example is used to calculate and analyze the secondary stress of truss steel-reinforced concrete transfer beams.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU398.9

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