本文選題：火災(zāi)后　切入點(diǎn)：圓截面鋼管鋼筋混凝土　出處：《遼寧工程技術(shù)大學(xué)》2014年碩士論文

【摘要】：鋼管鋼筋混凝土結(jié)構(gòu)是指在普通鋼管素混凝土中填充縱向受力鋼筋,形成的一種新型組合結(jié)構(gòu)。此種結(jié)構(gòu)形式上雖然簡(jiǎn)單,但火災(zāi)作用下,內(nèi)部鋼筋在混凝土的保護(hù)下升溫緩慢,強(qiáng)度損失小,提高其抗火性能；火災(zāi)作用后,鋼材的強(qiáng)度能夠得到恢復(fù),力學(xué)性能比高溫下有所改善,結(jié)構(gòu)的整體性也比火災(zāi)中所提高,這不僅為結(jié)構(gòu)的修復(fù)加固提供了一個(gè)較為安全的工作環(huán)境,也可減少工作量,降低維修費(fèi)用。于是,本文對(duì)火災(zāi)后鋼管鋼筋混凝土軸壓短柱進(jìn)行了試驗(yàn)研究和有限元分析,主要工作如下：(1)本文對(duì)12根火災(zāi)后及6根常溫下圓鋼管鋼筋混凝土軸壓短柱進(jìn)行剩余承載力試驗(yàn)研究和2根試件的溫度場(chǎng)試驗(yàn)研究。研究表明試件的破壞模式均為剪切破壞,常溫試件的剪切角為450左右,火災(zāi)后試件的剪切角為60°左右；受火時(shí)間是影響剩余承載力的主要因素,隨著受火時(shí)間的增加,火災(zāi)后圓鋼管鋼筋混凝土軸壓短柱剩余承載力隨受火升溫時(shí)間的增加而減��；配筋率對(duì)其剩余承載力的影響不大。(2)利用ABAQUS大型有限元軟件建立火災(zāi)后鋼管鋼筋混凝土軸壓短柱有限元分析模型,并與本文試驗(yàn)及收集到的相關(guān)試驗(yàn)數(shù)據(jù)進(jìn)行驗(yàn)證,結(jié)果表明數(shù)據(jù)吻合較好,所建模型基本正確。(3)詳細(xì)分析受火升溫時(shí)間、截面尺寸、材料強(qiáng)度等參數(shù)對(duì)其剩余承載力系數(shù)的影響規(guī)律；進(jìn)而回歸出便于工程實(shí)踐應(yīng)用的火災(zāi)后鋼管鋼筋混凝土軸壓短柱剩余承載力的簡(jiǎn)化計(jì)算公式。結(jié)果表明受火升溫時(shí)間、截面尺寸是影響其剩余承載力系數(shù)的主要因素。
[Abstract]:Reinforced concrete filled steel tube (CFST) structure is a new type of composite structure, which is filled with longitudinal steel bars in plain concrete filled with steel tube.Although this kind of structure is simple in form, under the action of fire, the internal steel bar increases temperature slowly under the protection of concrete, the strength loss is small, and the fire resistance is improved. After the fire, the strength of steel can be restored.The mechanical properties are improved compared with those under high temperature, and the integrity of the structure is also improved compared with the fire. This not only provides a safe working environment for the repair and reinforcement of the structure, but also reduces the workload and maintenance costs.Therefore, the experimental study and finite element analysis of steel tubular reinforced concrete columns under axial compression are carried out in this paper.The main work is as follows: (1) in this paper, the residual bearing capacity of 12 reinforced concrete filled steel tubular columns under axial compression and the temperature field of 2 specimens are studied.The results show that the failure mode of the specimens is shear failure, the shear angle of the specimens at room temperature is about 450, the shear angle of the specimens after fire is about 60 擄, the fire time is the main factor affecting the residual bearing capacity, and with the increase of the fire time, the shear angle of the specimens is about 450, and the shear angle of the specimens after fire is about 60 擄.After fire, the residual bearing capacity of circular steel tubular reinforced concrete columns under axial compression decreases with the increase of heating time.The influence of reinforcement ratio on its residual bearing capacity is not significant. (2) the finite element analysis model of reinforced concrete filled steel tubular short columns under axial compression after fire is established by using ABAQUS software, and it is verified by the experimental data collected in this paper.The results show that the data are in good agreement, and the model is basically correct. (3) the influence of the temperature rise time, section size, material strength and other parameters on the residual bearing capacity coefficient is analyzed in detail.A simplified formula for calculating the residual bearing capacity of reinforced concrete filled steel tube short columns under axial compression after fire is obtained, which is convenient for engineering practice.The results show that the time of heating and the size of section are the main factors affecting the coefficient of residual bearing capacity.
【學(xué)位授予單位】：遼寧工程技術(shù)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;TU352.5

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