【作者】 苏献祥；

【导师】 闫月梅；

【作者基本信息】 西安科技大学 ， 结构工程， 2009， 硕士

【摘要】 近年来,随着建筑技术的发展,钢管混凝土结构逐渐被广泛应用于建筑结构尤其是在高层建筑结构中。与圆、方钢管混凝土结构相比,矩形钢管混凝土有着与梁连接简单,稳定性能好,防火造价低等优势;与实心钢管混凝土结构相比,中空夹层钢管混凝土结构有着抗弯刚度大,自重轻、抗震性能好,抗火性能好等优势。但目前国内外对矩形钢管混凝土特别是矩形中空夹层钢管混凝土的相关研究很少,因此其受力机理及承载力方面的研究具有重要的理论意义和工程参考价值。本文利用有限元ANSYS软件,在确定钢材和核心混凝土在往复荷载作用下的应力-应变关系模型的基础上,考虑长细比、轴压比、含钢率和高宽比等参数,进行了4个系列13根实心矩形钢管混凝土柱在循环荷载作用下绕弱轴弯曲的模拟计算;在相同轴压力作用下只考虑不同截面空心率的情况,进行了4根矩形中空夹层钢管混凝土柱试件在循环荷载作用下绕强轴弯曲的模拟计算。通过对计算结果包括P-△曲线、滞回曲线、轴向压缩、刚度退化、能量耗散、骨架曲线和变形能力等的变化规律进行了分析、比较和研究。结果表明:①矩形实心钢管混凝土柱绕弱轴弯曲的滞回曲线均呈比较饱满的“梭形”,没有明显的捏缩现象;达到极限荷载后,仍表现出良好的延性和后期变形能力;能量耗散系数在2.64~2.94之间,说明矩形钢管混凝土柱绕弱轴弯曲时也具有良好的抗震性能和耗能能力;②通过分析得出了循环荷载作用下长细比、轴压比、含钢率和高宽比对矩形实心钢管混凝土柱抗震性能的影响规律,表明长细比、轴压比、含钢率和高宽比都是影响实心矩形钢管混凝土柱抗震性能的主要因素;③矩形中空夹层钢管混凝土柱绕强轴弯曲的滞回曲线均呈比较饱满的“梭形”,没有明显的捏缩现象;达到极限荷载后,仍表现出良好的延性和后期变形能力,随着截面空心率的增大,试件的水平承载力随之增大,但试件的耗能系数及等效粘滞阻尼系数逐渐降低,其抗震性能逐渐降低。本文全面、系统、深入地分析了矩形实心钢管混凝土柱绕弱轴弯曲和矩形中空夹层钢管混凝土柱绕强轴弯曲时在循环荷载作用下的受力性能,研究工作和得到的结论对于指导工程设计具有一定的参考价值,为进一步研究矩形钢管混凝土柱的抗震性能打下了良好的基础。更多还原

【Abstract】 In recent years, as the architectural technical developments, the concrete-filled steel structures has gradually been applied in the architectural structure especially in the high buildings. Compared with the circular concrete-filled steel tubular, concrete-filled rectangular steel tubular have some advantages: easier to connect with beams; better stability; and the low cost of fire prevention etc. Compared with the solid concrete-filled rectangular steel tubular(SCFRST); Concrete filled rectangular double skin steel Tubes (CFDRST) have some advantages:easier to connect with beams; ethereal of deadweight; and the low cost of fire prevention etc.But few research studies have been dealt with in this area in the past,so the study of it possesses important theoretic and engineering reference value.In this paper, based on the finite element program of ANSYS, on the basis of the stress-strain models of determining the steel and concrete under dynamic actions; In this paper, 4 series 13 specimens of SCFRST columns which around the weak-axis bending and 4specimens of CFDRST columns which around the strong-axis bending are tested under cycle loading, the main parameters are axial compressive force ratio, steel ratio, slenderness ratio and section height to width ratio. The results of the experiment have been analysed and compared, which in cludes the rule of P-△behavior, hysteretic behavior, axial shortening, stiffness decay, energy dissipation, skeleton curve, ductility capacity. The test results show that:①the SCFRST columns which around the weak-axis bending has plump hysteretic loops; good ductility and evening deformation ability after the joints reach ultimate load;The energy dissipation coefficient is between 2.64 and 2.94,which shows that the SCFRST columns which around the weak-axis bending has superior seismic behavior and energy dissipation ability;②Through analyzing the curves we can know that the influence of the axial compressive force ratio, steel ratio, slenderness ratio and section height to width ratio on the hysteretic behavior of the SCFRST columns is concluded, and the axial compressive force ratio, steel ratio, slenderness ratio and section height to width ratio are the main keys influence factor for the hysteretic behavior;③The CFDRST columns which around the strong-axis bending has plump hysteretic loops; good ductility and evening deformation ability after the joints reach ultimate load; With the hollow section ratio increased, the level of bearing capacity of the manufacturing increases, but the energy dissipation coefficient decreased gradually reduce, and its seismic behavior decreased gradually reduce.The paper analyzes bearing capacity of the SCFRST columns which around the weak-axis bending and the CFDRST columns which around the weak-axis bending under the monotone circle load deeply. It is valuable to modify related codes, and to direct practical engineering design. It is a good foundation for earth-quake resistance of the concrete filled steel-tubular structure.更多还原