本文選題：鋼管再生混凝土 + 高溫��； 參考：《廣西大學》2013年碩士論文

【摘要】：鋼管再生混凝土(Recycle Aggregate Concrete-Filled Steel Tubes, RACFST),是指在鋼管中填充再生混凝土,使鋼管和核心混凝土能共同承受外荷載作用的結構構件,發(fā)揮了鋼管和再生混凝土各自的優(yōu)勢,為再生混凝土的應用與發(fā)展提供了一個重要途徑。國內(nèi)外學者對常溫下鋼管普通混凝土和鋼管再生混凝土的力學性能、高溫作用后鋼管普通混凝土的力學性能進行了大量的研究,但是對火災(高溫)后鋼管再生混凝土的研究鮮有報道。因此,本文對其力學性能進行了試驗研究,研究內(nèi)容如下： (1)為了研究火災(高溫)后鋼管再生混凝土軸壓短柱的極限承載力及變形能力,以再生粗骨料取代率、恒溫溫度、恒溫時間、核心混凝土強度為主要參數(shù),進行了28個火災(高溫)后圓鋼管再生混凝土軸壓短柱試驗研究,同時進行了16個圓鋼管普通混凝土軸壓短柱對比試驗。試驗觀察了軸壓試件的受力全過程及破壞形態(tài),獲取了應力-應變曲線,分析了再生粗骨料取代率、恒溫溫度、恒溫時間、核心混凝土強度對試件軸壓承載力、彈性模量、變形性能、剛度退化性能、耗能能力的影響規(guī)律。利用韓林海關于高溫作用后鋼管普通混凝土短柱的承載力計算公式對本試驗的軸壓試件進行計算,并與試驗實測結果比較。最后根據(jù)試驗的實測結果,提出了再生粗骨料取代率、恒溫溫度、核心混凝土強度三個變化參數(shù)影響下,火災(高溫)后鋼管再生混凝土軸壓短柱的強度計算公式。 (2)為了研究火災(高溫)后圓鋼管再生混凝土柱的偏壓性能,考慮了再生粗骨料取代率、恒溫溫度兩個變化參數(shù)的影響,設計了9個試件進行單調(diào)偏心加載試驗。觀察了試件的破壞形態(tài),獲取了試件受力全過程曲線,得到了試件中部截面縱向與環(huán)向的應變分布情況,并分析了再生粗骨料取代率和恒溫溫度兩個變化參數(shù)對試件的極限承載力和耗能性能的影響。
[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.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU398.9

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