火灾（高温）后钢管再生混凝土柱力学性能试验研究

发布时间：2018-06-15 18:23

本文选题：钢管再生混凝土 + 高温　；参考：《广西大学》2013年硕士论文

【摘要】：钢管再生混凝土(Recycle Aggregate Concrete-Filled Steel Tubes, RACFST),是指在钢管中填充再生混凝土,使钢管和核心混凝土能共同承受外荷载作用的结构构件,发挥了钢管和再生混凝土各自的优势,为再生混凝土的应用与发展提供了一个重要途径。国内外学者对常温下钢管普通混凝土和钢管再生混凝土的力学性能、高温作用后钢管普通混凝土的力学性能进行了大量的研究,但是对火灾(高温)后钢管再生混凝土的研究鲜有报道。因此,本文对其力学性能进行了试验研究,研究内容如下： (1)为了研究火灾(高温)后钢管再生混凝土轴压短柱的极限承载力及变形能力,以再生粗骨料取代率、恒温温度、恒温时间、核心混凝土强度为主要参数,进行了28个火灾(高温)后圆钢管再生混凝土轴压短柱试验研究,同时进行了16个圆钢管普通混凝土轴压短柱对比试验。试验观察了轴压试件的受力全过程及破坏形态,获取了应力-应变曲线,分析了再生粗骨料取代率、恒温温度、恒温时间、核心混凝土强度对试件轴压承载力、弹性模量、变形性能、刚度退化性能、耗能能力的影响规律。利用韩林海关于高温作用后钢管普通混凝土短柱的承载力计算公式对本试验的轴压试件进行计算,并与试验实测结果比较。最后根据试验的实测结果,提出了再生粗骨料取代率、恒温温度、核心混凝土强度三个变化参数影响下,火灾(高温)后钢管再生混凝土轴压短柱的强度计算公式。 (2)为了研究火灾(高温)后圆钢管再生混凝土柱的偏压性能,考虑了再生粗骨料取代率、恒温温度两个变化参数的影响,设计了9个试件进行单调偏心加载试验。观察了试件的破坏形态,获取了试件受力全过程曲线,得到了试件中部截面纵向与环向的应变分布情况,并分析了再生粗骨料取代率和恒温温度两个变化参数对试件的极限承载力和耗能性能的影响。
[Abstract]:Recycled concrete filled steel tube Aggregate Concrete-Filled Steel Tubes (RACFST) is a structural member which is filled with recycled concrete in the steel tube so that the steel tube and the core concrete can withstand the external load together, thus giving play to the respective advantages of the steel tube and the recycled concrete. It provides an important way for the application and development of recycled concrete. Scholars at home and abroad have done a lot of research on the mechanical properties of ordinary concrete filled steel tube (CFST) and recycled concrete filled steel tube (CFST) at room temperature, and the mechanical properties of CFST under high temperature. However, there are few reports on recycled concrete filled steel tube after fire (high temperature). In order to study the ultimate bearing capacity and deformation capacity of recycled concrete filled steel tubular columns under axial compression after fire (high temperature), the replacement rate of recycled coarse aggregate is used. The axial compression short columns of recycled concrete filled circular steel tube after fire (high temperature) were studied in 28 cases with constant temperature time and core concrete strength as main parameters. At the same time 16 short columns of circular steel tubular concrete under axial compression were tested and compared. The stress process and failure mode of axial compression specimens were observed, the stress-strain curves were obtained, and the replacement rate of recycled coarse aggregate, constant temperature, constant temperature time, core concrete strength to axial compression capacity and elastic modulus of the specimens were analyzed. Deformation performance, stiffness degradation performance, energy dissipation capacity of the influence law. The bearing capacity of ordinary concrete filled steel tubular short columns subjected to high temperature was calculated by Han Linhai, and the axial compression specimens were calculated and compared with the measured results. Finally, according to the measured results of the test, three parameters, such as replacement rate of recycled coarse aggregate, constant temperature and strength of the core concrete, are proposed. In order to study the eccentric compression behavior of recycled concrete filled steel tubular columns after fire (high temperature), the replacement ratio of recycled coarse aggregate is considered. Nine specimens were designed for monotonic eccentric loading under the influence of two parameters of constant temperature and temperature. The failure pattern of the specimen is observed, the whole process curve of the specimen force is obtained, and the longitudinal and circumferential strain distribution of the middle section of the specimen is obtained. The influence of two parameters, the replacement ratio of recycled coarse aggregate and the constant temperature on the ultimate bearing capacity and energy dissipation performance of the specimen was analyzed.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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