【摘要】：隨著現(xiàn)代經(jīng)濟(jì)地飛速發(fā)展，許多高樓大廈、工業(yè)廠房、高架橋梁也都磅礴升起。鋼管混凝土柱的應(yīng)用也越來越廣泛，日益受到許多研究學(xué)者的重視和研究。我國在早期已經(jīng)嘗試著開始使用鋼管混凝土柱，其原因：周期短，節(jié)省了支拆模板的時(shí)間；鋼筋用量至少可以節(jié)省一半；承載力高；耐火性能有了逐步地提高。但是，對于方鋼管混凝土柱的理論和試驗(yàn)研究卻比較少，尤其是在方鋼管混凝土柱的抗震性能方面。所以說，研究方鋼管混凝土柱的延性和抗震性能顯得極其重要。 本文通過大型的有限元分析軟件ABAQUS來模擬方鋼管混凝土柱在低周反復(fù)荷載作用下承載性能的有限元分析，依據(jù)有限元的基本思想及求解方法，建立了6個(gè)基本試件，研究方鋼管混凝土柱在低周反復(fù)荷載作用下的滯回性能和延性，在前人所做的基礎(chǔ)上進(jìn)行了數(shù)值模擬，分析得出了構(gòu)件的滯回曲線，并將實(shí)驗(yàn)值和數(shù)值模擬值進(jìn)行了對比分析，得出數(shù)值模擬的可行性。然后設(shè)置了9個(gè)試件，分別從軸壓比、長細(xì)比、套箍系數(shù)這3個(gè)影響因素來考慮分析方鋼管混凝土柱的滯回曲線和骨架曲線，總結(jié)出：得到的滯回曲線圖形比較飽滿，并沒有明顯的捏縮現(xiàn)象；隨著軸壓比的逐漸增大，骨架曲線呈現(xiàn)出上升的趨勢，表現(xiàn)出了比較好的塑性能力和抗震性能；隨著長細(xì)比的逐漸增大，骨架曲線呈現(xiàn)出上升的趨勢；隨著套箍系數(shù)的逐漸增大，骨架曲線也呈現(xiàn)出上升的趨勢。然后在通過正交對比分析方法，研究這3個(gè)影響因素對延性系數(shù)的影響程度，發(fā)現(xiàn)軸壓比對方鋼管混凝土柱的延性系數(shù)影響最大，，其次是套箍系數(shù)，最后是長細(xì)比。最后用SPSS多元非線性回歸分析，推導(dǎo)出軸壓比、長細(xì)比、套箍系數(shù)這3個(gè)影響因素對延性系數(shù)的回歸方程，并且還做了F分布的檢驗(yàn)，得出在0.01水平上顯著。 通過本文的分析，可對今后高層建筑或者是復(fù)雜的工業(yè)廠房結(jié)構(gòu)對方鋼管混凝土柱抗震性能的要求提供理論分析依據(jù)。
[Abstract]:With the rapid development of modern economy, many high-rise buildings, industrial buildings and viaducts have also risen majestically. The application of concrete filled steel tube (CFST) column is becoming more and more extensive, which has been paid more and more attention by many scholars. China has tried to use concrete-filled steel tube columns in the early stage because of its short period, saving the time of breaking down the formwork, saving at least half of the amount of steel bars, high bearing capacity, and improving the fire resistance step by step. However, there are few theoretical and experimental studies on concrete-filled square steel tube columns, especially on the seismic behavior of concrete-filled square steel tube columns. Therefore, it is very important to study the ductility and seismic behavior of concrete filled square steel tube columns. In this paper, the finite element analysis of concrete-filled square steel tubular columns under low cyclic loading is simulated by large-scale finite element analysis software ABAQUS. According to the basic idea and solving method of finite element, six basic specimens are established. The hysteretic behavior and ductility of concrete filled square steel tube (CFST) columns under low cyclic loading are studied. Based on the previous results, the hysteretic curves of the concrete filled square steel tubular columns are obtained, and the experimental values and numerical simulation values are compared and analyzed. The feasibility of numerical simulation is obtained. Then nine specimens were set up, and the hysteretic curves and skeleton curves of concrete filled square steel tube columns were analyzed from the three influencing factors of axial compression ratio, slenderness ratio and hoop coefficient respectively. The results showed that the hysteresis curves were full, and the results showed that the hysteretic curves of concrete filled square steel tubular columns were full, and the hysteresis curves of concrete filled steel tubular columns were analyzed. There is no obvious contraction phenomenon; With the increase of axial compression ratio, the skeleton curve shows an upward trend, showing a better plasticity and seismic performance, and with the increasing of the slenderness ratio, the skeleton curve shows an upward trend. With the increase of hoop coefficient, the skeleton curve also showed an upward trend. Then by means of orthogonal comparative analysis, the influence degree of these three factors on ductility coefficient is studied. It is found that axial compression ratio has the greatest influence on ductility coefficient of concrete-filled steel tube columns, followed by hoop coefficient, and finally the slenderness ratio. Finally, the regression equations of axial compression ratio, slenderness ratio and hoop coefficient for ductility coefficient are derived by means of SPSS multivariate nonlinear regression analysis, and the test of F distribution is also made, and the results show that it is significant at 0. 01 level. Through the analysis in this paper, we can provide a theoretical basis for the seismic performance of concrete-filled steel tubular columns in high-rise buildings or complex industrial workshop structures in the future.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU398.9

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