【摘要】：針對(duì)目前對(duì)約束拉桿方形鋼管混凝土短柱的研究主要集中于其靜力性能方面,尚缺乏對(duì)該種截面形式構(gòu)件在往復(fù)荷載作用下的抗震性能研究,為進(jìn)一步完善帶約束拉桿方形鋼管混凝土的科學(xué)理論體系,深入了解其力學(xué)性能和抗震性能,本文采用試驗(yàn)研究、理論分析和數(shù)值模擬相結(jié)合的方法對(duì)帶約束拉桿方形鋼管混凝土短柱開展抗震性能試驗(yàn)研究和理論分析。主要研究內(nèi)容和成果如下： (1)完成了3個(gè)不帶約束拉桿和8個(gè)帶約束拉桿的方形鋼管混凝土短柱在低周反復(fù)荷載作用下的試驗(yàn)研究。考察了軸壓比和約束拉桿布置間距等參數(shù)對(duì)其抗震性能的影響。試驗(yàn)結(jié)果表明：帶約束拉桿方形鋼管混凝土短柱具有良好的承載力、延性和耗能能力,且抗震性能優(yōu)于不帶約束拉桿試件。 (2)隨著軸壓比的增大,帶約束拉桿方形鋼管混凝土短柱的變形能力降低,但試件的耗能能力有所提高,試件承載能力隨軸壓比的增大呈現(xiàn)出先增大后減小的趨勢。帶約束拉桿方形鋼管混凝土短柱在軸壓比較大時(shí),抗震性能有顯著優(yōu)勢。 (3)減小約束拉桿布置間距,可顯著提高試件的承載能力和極限變形能力,承載力退化和剛度退化明顯變緩,試件的抗震性能和延性性能明顯改善。僅減小試件約束拉桿的縱向間距或橫向間距也能夠有效地改善試件抗震性能。約束拉桿縱向間距的減小,能夠顯著提高試件承載能力和耗能能力；而隨著約束拉桿橫向間距的減小,試件的極限變形能力呈增大趨勢。 (4)基于ABAQUS平臺(tái)建立起構(gòu)件數(shù)值模型,完善了材料本構(gòu)模型,對(duì)帶約束拉桿方形鋼管混凝土短柱的荷載-變形關(guān)系曲線進(jìn)行了計(jì)算,數(shù)值模擬計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好,并在此基礎(chǔ)上針對(duì)構(gòu)件進(jìn)行了系統(tǒng)的參數(shù)分析,深入分析和研究了帶約束拉桿方形鋼管混凝土柱的受力工作機(jī)理。 (5)基于試驗(yàn)獲取的骨架曲線和滯回曲線結(jié)果,采用試驗(yàn)擬合法,建立了帶約束拉桿方形鋼管混凝土柱骨架曲線簡化三折線模型,給出了骨架曲線各個(gè)關(guān)鍵點(diǎn)的計(jì)算公式,并對(duì)循環(huán)反復(fù)加卸載下的恢復(fù)力模型滯回規(guī)律作出了總結(jié)。
[Abstract]:At present, the research on confined concrete-filled square steel tube short columns mainly focuses on its static performance, but there is still lack of research on the seismic behavior of this kind of cross-section members under reciprocating loads. In order to further improve the scientific and theoretical system of concrete filled square steel tube with confined tension bars and understand its mechanical and seismic properties, this paper adopts the experimental study, The experimental study and theoretical analysis of seismic behavior of concrete-filled square steel tube short columns with confined tension bars are carried out by combining theoretical analysis with numerical simulation. The main research contents and achievements are as follows: (1) three concrete filled square concrete filled steel tubular short columns without restraint and eight short columns with tie bars under low cyclic loading have been tested. The influence of the axial compression ratio and the spacing of the constrained tension rod on its seismic performance is investigated. The experimental results show that the concrete-filled square steel tube short columns with confined tension bars have good bearing capacity, ductility and energy dissipation capacity, and the seismic performance is better than that of the specimens without restraint. (2) with the increase of axial compression ratio, the deformation capacity of concrete-filled square steel tube short column with confined tension rod decreases, but the energy dissipation capacity of the specimen increases, and the bearing capacity of the specimen increases first and then decreases with the increase of axial compression ratio. The seismic performance of concrete-filled square steel tube short columns with confined tension bars is superior to that of concrete-filled steel tubular columns under large axial compression. (3) the bearing capacity and ultimate deformation capacity of the specimen can be significantly improved by decreasing the spacing between the tie bars, the degradation of bearing capacity and the degradation of stiffness become slower, and the seismic performance and ductility performance of the specimen are obviously improved. The seismic performance of the specimen can also be improved by only decreasing the longitudinal or transverse spacing of the confined tensile rod. The load-bearing capacity and energy dissipation capacity of the specimen can be significantly improved with the decrease of the longitudinal spacing of the restrained tension rod, while the ultimate deformation capacity of the specimen increases with the decrease of the transverse spacing of the restrained tension rod. (4) based on the ABAQUS platform, the numerical model of the member is established, and the material constitutive model is perfected. The load-deformation relation curve of the concrete-filled square concrete filled steel tube short column with confined tension bar is calculated. The numerical simulation results are in good agreement with the experimental results, and the results of numerical simulation are in good agreement with the experimental results. On this basis, a systematic parameter analysis is carried out for the members, and the working mechanism of the concrete-filled square steel tube columns with confined tension bars is deeply analyzed and studied. (5) based on the experimental results of skeleton curve and hysteretic curve, the simplified three-fold curve model of square concrete filled steel tube column with restrained tension bar is established by the method of test fitting, and the calculation formulas of each key point of skeleton curve are given. The hysteretic law of restoring force model under cyclic loading and unloading is summarized.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9

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