【摘要】：隨著我國城鎮(zhèn)化建設(shè)進(jìn)程的發(fā)展,建筑廢棄物的排放量不斷增長,不僅導(dǎo)致了資源和土地的浪費(fèi),還造成了環(huán)境的污染。因此,再生混凝土的使用將成為建筑垃圾資源化利用的一種有效途徑。但是由于再生混凝土的各項(xiàng)性能指標(biāo)都低于普通混凝土,使得其結(jié)構(gòu)性能也有所降低,嚴(yán)重阻礙了再生混凝土在實(shí)際工程中的應(yīng)用。將再生混凝土用于鋼-混凝土組合結(jié)構(gòu)中,既發(fā)揮了組合結(jié)構(gòu)承載力高、剛度大、抗震性能好等優(yōu)點(diǎn),又彌補(bǔ)了再生混凝土力學(xué)性能的缺陷,同時(shí)具有保護(hù)環(huán)境的重大意義。本文制作了4組型鋼再生混凝土梁,研究型鋼再生混凝土梁的抗彎性能;通過變換再生粗骨料取代率和配箍率,對型鋼再生混凝土梁的變形情況及承載力變化進(jìn)行分析。并根據(jù)試驗(yàn)數(shù)據(jù),在現(xiàn)有型鋼混凝土梁承載力計(jì)算規(guī)程的基礎(chǔ)上,探討了符合型鋼再生混凝土的計(jì)算公式。本文還利用有限元軟件ABAQUS對試驗(yàn)構(gòu)件進(jìn)行了非線性有限元分析,介紹了從選取材料模型、建立幾何模型、劃分單元、施加荷載和邊界條件到求解的各個(gè)步驟,并將有限元分析結(jié)果與試驗(yàn)結(jié)果進(jìn)行了比較。通過試驗(yàn)以及有限元結(jié)果分析,得出的主要結(jié)論如下:(1)與型鋼普通混凝土梁的破壞形式相同,型鋼再生混凝土梁也具有明顯的彈性、開裂、屈服和極限4個(gè)受力階段特點(diǎn),型鋼再生混凝土梁與型鋼普通混凝土梁的受彎機(jī)理基本相同。(2)在配箍率相同的情況下,不同粗骨料取代率的型鋼再生混凝土梁的極限承載力沒有顯著差別。(3)再生混凝土取代率相同的情況下,配箍率對型鋼再生混凝土梁的極限承載力無明顯影響,但是對型鋼再生混凝土的裂縫發(fā)展有一定影響。(4)型鋼再生混凝土梁基本符合平截面假定。(5)有限元分析結(jié)果與試驗(yàn)結(jié)果一致,ABAQUS可以用來分析其它因素對型鋼再生混凝土梁抗彎性能的影響。
[Abstract]:With the development of urbanization in our country, the emission of construction waste is increasing, which not only leads to the waste of resources and land, but also causes the pollution of environment. Therefore, the use of recycled concrete will become an effective way of building waste resource utilization. However, because the performance index of recycled concrete is lower than that of ordinary concrete, the structural performance of recycled concrete is also reduced, which seriously hinders the application of recycled concrete in practical engineering. The use of recycled concrete in steel-concrete composite structures not only brings into play the advantages of high bearing capacity, high stiffness and good seismic performance of composite structures, but also makes up for the defects of mechanical properties of recycled concrete, and has great significance in protecting the environment at the same time. In this paper, four groups of steel recycled concrete beams have been made to study the flexural properties of steel recycled concrete beams, and the deformation and bearing capacity of steel recycled concrete beams have been analyzed by changing the substitution rate of recycled coarse aggregate and stirrups ratio. Based on the experimental data and on the basis of the existing rules for calculating the bearing capacity of steel reinforced concrete beams, the calculation formula of steel reinforced recycled concrete is discussed. In this paper, the nonlinear finite element analysis of the test member is carried out by using the finite element software ABAQUS. The steps of selecting material model, establishing geometric model, dividing element, applying load and boundary condition to the solution are introduced. The finite element analysis results are compared with the experimental results. Through the test and the finite element analysis, the main conclusions are as follows: (1) the failure form of the steel reinforced ordinary concrete beam is the same as that of the steel reinforced ordinary concrete beam, and the steel recycled concrete beam also has obvious elasticity and cracking. The bending mechanism of the steel-reinforced recycled concrete beam is the same as that of the ordinary steel-reinforced concrete beam. (2) under the same stirrups ratio, the bending mechanism of the steel-reinforced recycled concrete beam is the same as that of the ordinary steel-reinforced concrete beam. There is no significant difference in the ultimate bearing capacity of steel-reinforced recycled concrete beams with different substitution rates of coarse aggregate. (3) under the same replacement rate of recycled concrete, the stirrup ratio has no obvious effect on the ultimate bearing capacity of steel-reinforced recycled concrete beams. However, it has a certain effect on the crack development of steel-reinforced recycled concrete. (4) the steel-reinforced recycled concrete beam basically accords with the assumption of plane section. (5) the results of finite element analysis are consistent with the experimental results. ABAQUS can be used to analyze the effect of other factors on the flexural behavior of steel-reinforced recycled concrete beams.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU398.9

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本文編號：2434997