本文選題：數(shù)值模擬 + 核心筒��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：核心筒結(jié)構(gòu)已在我國高層及超高層建筑結(jié)構(gòu)中普遍運(yùn)用。連梁基體采用纖維增強(qiáng)水泥基復(fù)合材料(FRCC)替代混凝土形成的FRCC連梁核心筒結(jié)構(gòu)兼具了混凝土核心筒抗側(cè)剛度大和FRCC塑性耗能能力強(qiáng)的優(yōu)點(diǎn),具有良好的承載力和耗能能力,能有效提高核心筒結(jié)構(gòu)抗震性能。因此,對FRCC連梁核心筒的抗震性能展開深入研究至關(guān)重要。本文主要包括以下內(nèi)容:(1)通過FRCC材性試驗(yàn),得到其試驗(yàn)應(yīng)力-應(yīng)變曲線。結(jié)合試驗(yàn)曲線擬合出FRCC理論曲線。通過比較發(fā)現(xiàn)FRCC應(yīng)力-應(yīng)變理論曲線與試驗(yàn)曲線較為吻合,說明筆者推導(dǎo)的FRCC本構(gòu)關(guān)系能夠比較客觀的反映該種材料的單軸受壓和受拉性能。(2)運(yùn)用有限元軟件ABAQUS建立鋼筋混凝土核心筒數(shù)值模型CW-1,對模型在低周反復(fù)荷載作用下的抗震性能進(jìn)行有限元模擬計(jì)算,將模擬與試驗(yàn)結(jié)果進(jìn)行對比。結(jié)果表明兩者在骨架曲線、抗剪承載力、屈服位移、極限位移、延性和剛度退化曲線等方面基本一致,表明所建有限元模型有效。(3)將模型CW-1連梁基體由混凝土替換為同強(qiáng)度等級FRCC,建立FRCC連梁核心筒數(shù)值模型CH-1,進(jìn)行數(shù)值計(jì)算。對比分析CH-1與CW-1滯回曲線、骨架曲線、剛度退化曲線和延性,結(jié)果表明FRCC連梁能有效提高核心筒耗能能力和延性,并能增大初始剛度,減緩剛度退化。(4)以CH-1模型為基礎(chǔ),對其進(jìn)行變參數(shù)循環(huán)加載分析,分別研究了軸壓比、核心筒高寬比、連梁跨高比、連梁配筋率及連梁面積配箍率對FRCC連梁核心筒結(jié)構(gòu)抗震性能的影響。并在有限元分析的基礎(chǔ)上,對FRCC連梁核心筒結(jié)構(gòu)提出了相關(guān)的設(shè)計(jì)建議,并提供抗震設(shè)計(jì)意見。
[Abstract]:The core tube structure has been widely used in high-rise and super-high-rise buildings in our country. The FRCC core tube structure formed by replacing concrete with fiber reinforced cement matrix has the advantages of high lateral stiffness of concrete core tube and strong plastic energy dissipation capacity of FRCC, and has good bearing capacity and energy dissipation capacity. It can effectively improve the seismic performance of the core tube structure. Therefore, it is very important to study the seismic behavior of the core tube of FRCC beam. The main contents of this paper are as follows: (1) the stress-strain curve of FRCC is obtained through the experiment of its properties. The theoretical curve of FRCC is fitted according to the experimental curve. By comparison, it is found that the FRCC stress-strain theory curve is in good agreement with the experimental curve. It shows that the FRCC constitutive relation derived by the author can objectively reflect the uniaxial compressive and tensile properties of the material. (2) the numerical model CW-1 of the reinforced concrete core tube is established by using the finite element software ABAQUS, and the model is subjected to cyclic loading at low cycle. The seismic behavior of the system is simulated by finite element method. The simulation results are compared with the experimental results. The results show that the skeleton curves, shear bearing capacity, yield displacement, ultimate displacement, ductility and stiffness degradation curves are basically the same. It is shown that the finite element model is effective. The model CW-1 beam matrix is replaced by concrete with the same strength grade FRC. The numerical model CH-1 of FRCC connecting beam core tube is established and the numerical calculation is carried out. The hysteretic curves, skeleton curves, stiffness degradation curves and ductility of CH-1 and CW-1 are compared. The results show that the FRCC beam can effectively improve the energy dissipation and ductility of the core tube, increase the initial stiffness, and slow down the degradation of the stiffness. It is based on the CH-1 model. The effects of axial compression ratio, ratio of height to width of core tube, ratio of span to span of connecting beam, reinforcement ratio of connecting beam and hoop ratio of continuous beam area on seismic behavior of FRCC core tube structure are studied. On the basis of the finite element analysis, the paper puts forward some relevant design suggestions for the core tube structure of FRCC beam connecting beam, and provides some suggestions for seismic design.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU973.17;TU973.31

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