本文選題：鋼管再生混凝土 + 高溫��； 參考：《廣西大學(xué)》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(jié)構(gòu)構(gòu)件,發(fā)揮了鋼管和再生混凝土各自的優(yōu)勢(shì),為再生混凝土的應(yīng)用與發(fā)展提供了一個(gè)重要途徑。國(guó)內(nèi)外學(xué)者對(duì)常溫下鋼管普通混凝土和鋼管再生混凝土的力學(xué)性能、高溫作用后鋼管普通混凝土的力學(xué)性能進(jìn)行了大量的研究,但是對(duì)火災(zāi)(高溫)后鋼管再生混凝土的研究鮮有報(bào)道。因此,本文對(duì)其力學(xué)性能進(jìn)行了試驗(yàn)研究,研究?jī)?nèi)容如下： (1)為了研究火災(zāi)(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(shí)間、核心混凝土強(qiáng)度為主要參數(shù),進(jìn)行了28個(gè)火災(zāi)(高溫)后圓鋼管再生混凝土軸壓短柱試驗(yàn)研究,同時(shí)進(jìn)行了16個(gè)圓鋼管普通混凝土軸壓短柱對(duì)比試驗(yàn)。試驗(yàn)觀察了軸壓試件的受力全過(guò)程及破壞形態(tài),獲取了應(yīng)力-應(yīng)變曲線,分析了再生粗骨料取代率、恒溫溫度、恒溫時(shí)間、核心混凝土強(qiáng)度對(duì)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(guān)于高溫作用后鋼管普通混凝土短柱的承載力計(jì)算公式對(duì)本試驗(yàn)的軸壓試件進(jìn)行計(jì)算,并與試驗(yàn)實(shí)測(cè)結(jié)果比較。最后根據(jù)試驗(yàn)的實(shí)測(cè)結(jié)果,提出了再生粗骨料取代率、恒溫溫度、核心混凝土強(qiáng)度三個(gè)變化參數(shù)影響下,火災(zāi)(高溫)后鋼管再生混凝土軸壓短柱的強(qiáng)度計(jì)算公式。 (2)為了研究火災(zāi)(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(gè)變化參數(shù)的影響,設(shè)計(jì)了9個(gè)試件進(jìn)行單調(diào)偏心加載試驗(yàn)。觀察了試件的破壞形態(tài),獲取了試件受力全過(guò)程曲線,得到了試件中部截面縱向與環(huán)向的應(yīng)變分布情況,并分析了再生粗骨料取代率和恒溫溫度兩個(gè)變化參數(shù)對(duì)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(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU398.9

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本文編號(hào)：2023073