【摘要】：隨著建筑結(jié)構(gòu)向高聳、大跨、重載方向發(fā)展,柱子承受越來(lái)越大的荷載作用。近年來(lái),鋼骨-鋼管混凝土組合柱由于其延性好、承載力高等優(yōu)點(diǎn)而備受人們的關(guān)注。目前對(duì)這種組合柱的研究多集中在對(duì)稱配鋼上,考慮到柱子的不均勻受力狀態(tài)、建筑平面布置和建筑成本控制等要求,根據(jù)邊柱、角柱等特殊部位的受力情況,靈活配置型鋼,改變鋼骨截面形式,提出了內(nèi)置T形、L形鋼骨形式的鋼骨-鋼管混凝土組合柱,使其在滿足構(gòu)件受力性能的同時(shí),可有效地節(jié)省材料,降低構(gòu)件的造價(jià)。本文通過(guò)有限元軟件ANSYS對(duì)非對(duì)稱型鋼骨-鋼管混凝土組合柱的受力性能進(jìn)行模擬,主要完成了以下工作:(1)在總結(jié)以往鋼-混凝土組合柱受力性能試驗(yàn)和模擬分析的基礎(chǔ)上,選擇合適的材料本構(gòu)關(guān)系及接觸模型,建立了非對(duì)稱型鋼骨-鋼管混凝土組合柱的有限元分析模型。(2)對(duì)非對(duì)稱型鋼骨-鋼管混凝土組合短柱的軸壓受力性能進(jìn)行有限元模擬,分析其工作機(jī)理及承載能力,并討論其承載力影響因素,最后根據(jù)模擬結(jié)果及理論分析給出非對(duì)稱型鋼骨-鋼管混凝土軸壓組合短柱承載力計(jì)算公式,公式值與模擬值吻合良好。(3)對(duì)非對(duì)稱型鋼骨-鋼管混凝土軸壓組合長(zhǎng)柱的受力性能進(jìn)行有限元模擬,分析其破壞形態(tài)及工作機(jī)理,總結(jié)不同因素對(duì)軸壓長(zhǎng)柱穩(wěn)定性能的影響規(guī)律,基于回歸分析建立了安全簡(jiǎn)化的軸壓組合長(zhǎng)柱承載力計(jì)算公式。(4)通過(guò)有限元模擬,對(duì)非對(duì)稱型鋼骨-鋼管混凝土組合柱不同加載方向下的受彎力學(xué)性能進(jìn)行研究,分析純彎構(gòu)件力學(xué)性能的影響因素,基于極限平衡理論及回歸擬合給出了組合柱的抗彎承載力計(jì)算公式,且公式偏于安全。(5)通過(guò)有限元模擬,對(duì)非對(duì)稱型鋼骨-鋼管混凝土組合柱的壓彎力學(xué)性能進(jìn)行研究,分析其工作機(jī)理,討論偏壓構(gòu)件力學(xué)性能的影響因素,給出了典型構(gòu)件沿不同加載方向下的N-M關(guān)系曲線,并對(duì)其布置方式提出合理建議。最后基于模擬結(jié)果,給出了內(nèi)置T形鋼骨形式的鋼骨-鋼管混凝土組合柱偏壓承載力計(jì)算公式。
[Abstract]:With the development of high-rise, long-span and heavy-load buildings, the columns bear more and more loads. In recent years, steel-reinforced concrete filled steel tubular columns have attracted much attention because of their good ductility and high bearing capacity. At present, the research on this kind of composite column is mostly focused on symmetrical steel distribution. Considering the requirements of the non-uniform force state of the column, the layout of the building and the cost control of the building, according to the stress situation of the side column, the corner column and other special parts, the section steel can be configured flexibly. By changing the section form of steel bone, a steel steel-tubular concrete filled column with T-shaped and L-shaped steel bone is put forward, which can not only satisfy the mechanical properties of the members, but also save the material and reduce the cost of the members. In this paper, finite element software ANSYS is used to simulate the mechanical behavior of unsymmetrical steel-reinforced concrete filled steel tubular columns. The main works are as follows: (1) on the basis of summing up the previous tests and simulation analysis of the mechanical behavior of steel-concrete composite columns, the appropriate material constitutive relations and contact models are selected. The finite element analysis model of unsymmetrical steel-reinforced concrete filled steel tube composite column is established. (2) the axial compression behavior of asymmetric steel reinforced concrete filled steel tube composite column is simulated by finite element method, and its working mechanism and bearing capacity are analyzed. At last, according to the simulation results and theoretical analysis, a formula for calculating the bearing capacity of unsymmetrical steel-reinforced concrete filled steel tube composite short columns under axial compression is given. The formula values are in good agreement with the simulated values. (3) finite element simulation is carried out on the mechanical behavior of asymmetric steel-reinforced concrete filled steel tube composite columns under axial compression, and the failure mode and working mechanism are analyzed. This paper summarizes the influence of different factors on the stability performance of long columns under axial compression, and establishes a safe and simplified formula for calculating the bearing capacity of long columns under axial compression based on regression analysis. (4) by means of finite element simulation, The flexural mechanical properties of unsymmetrical steel-reinforced concrete filled steel tube composite columns under different loading directions were studied, and the influencing factors of mechanical properties of pure bending members were analyzed. Based on the limit equilibrium theory and regression fitting, the formula for calculating the flexural capacity of composite columns is given, and the formula is relatively safe. (5) through finite element simulation, the compressive and bending mechanical properties of composite columns with asymmetric steel-reinforced concrete filled steel tube are studied. The working mechanism is analyzed and the influencing factors of mechanical properties are discussed. The N-M relation curves of typical members along different loading directions are given and the reasonable suggestions for their layout are put forward. Finally, based on the simulation results, a formula for calculating the eccentric bearing capacity of steel-filled concrete filled steel tubular composite columns is given.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9

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