【摘要】：混凝土是工程常用材料,廣泛應(yīng)用于土木工程結(jié)構(gòu)和核電站等諸多領(lǐng)域。對(duì)混凝土材料的力學(xué)性能及耐久性進(jìn)行分析具有重要理論研究意義和實(shí)用價(jià)值。本文采用實(shí)驗(yàn)研究與有限元分析相結(jié)合的方法,對(duì)橡膠集料混凝土材料的基本力學(xué)性能以及橡膠集料混凝土梁的疲勞性能進(jìn)行分析。首先采用橡膠粒徑為5目、20目、40目和橡膠摻量為0%、10%、20%、30%、40%的橡膠集料等體積取代細(xì)骨料,按照水灰比0.45制備橡膠集料混凝土梁試件,進(jìn)行橡膠集料混凝土的立方體抗壓強(qiáng)度試驗(yàn)和抗折強(qiáng)度試驗(yàn),根據(jù)力學(xué)性能確定最佳橡膠粒徑為40目。然后以橡膠粒徑40目和橡膠摻量為0%、10%、20%、30%、40%的橡膠集料混凝土梁進(jìn)行軸壓試驗(yàn)和四點(diǎn)彎曲試驗(yàn),對(duì)試驗(yàn)現(xiàn)象和試驗(yàn)結(jié)果進(jìn)行分析,將不同橡膠摻量混凝土的實(shí)驗(yàn)參數(shù)帶入有限元軟件中進(jìn)行非線性分析;最后將應(yīng)力應(yīng)變結(jié)果以及疲勞性能參數(shù)導(dǎo)入疲勞分析軟件中分析其疲勞性能,研究不同橡膠摻量對(duì)橡膠集料混凝土梁疲勞壽命的影響。主要研究工作包括以下幾個(gè)方面:1.以橡膠粒徑為5目、20目、40目和橡膠摻量為0%、10%、20%、30%、40%的橡膠混凝土試件進(jìn)行立方體抗壓強(qiáng)度試驗(yàn)和抗折強(qiáng)度試驗(yàn)確定最佳橡膠粒徑;對(duì)多種橡膠摻量的橡膠集料混凝土梁進(jìn)行軸壓試驗(yàn)和四點(diǎn)彎曲試驗(yàn),通過(guò)對(duì)各橡膠集料混凝土梁試驗(yàn)現(xiàn)象以及試驗(yàn)結(jié)果的比較,研究了橡膠摻量對(duì)橡膠集料混凝土力學(xué)性能的影響;2.通過(guò)有限元軟件對(duì)不同橡膠摻量的橡膠集料混凝土梁進(jìn)行非線性分析,結(jié)合試驗(yàn)現(xiàn)象研究了橡膠集料混凝土梁受彎的裂縫發(fā)展?fàn)顩r;根據(jù)非線性分析計(jì)算結(jié)果研究了不同橡膠摻量的橡膠集料混凝土梁的開裂荷載、極限荷載和抗裂性能等,為橡膠集料混凝土梁破壞階段的受力情況以及破壞過(guò)程的分析提供理論基礎(chǔ);3.將非線性分析得出的應(yīng)力應(yīng)變結(jié)果以及疲勞性能參數(shù)導(dǎo)入疲勞分析軟件分析其疲勞性能,對(duì)計(jì)算結(jié)果進(jìn)行了擬合,得出了不同橡膠摻量混凝土梁的S—N曲線;對(duì)不同橡膠摻量混凝土梁的疲勞壽命計(jì)算結(jié)果和S—N曲線進(jìn)行分析,找出了橡膠集料混凝土梁的疲勞壽命與橡膠摻量和應(yīng)力水平之間的關(guān)系。
[Abstract]:Concrete is a common material used in engineering, widely used in civil engineering structures and nuclear power plants and many other fields. It is of great theoretical significance and practical value to analyze the mechanical properties and durability of concrete materials. In this paper, the basic mechanical properties of rubber aggregate concrete materials and the fatigue properties of rubber aggregate concrete beams are analyzed by means of the combination of experimental research and finite element analysis. At first, the rubber aggregate concrete beam specimens were prepared according to the water-cement ratio of 0.45 with rubber particle size of 5 mesh and 20 mesh of 20 mesh and rubber content of 0% 10% and 20% rubber aggregates and 40% rubber aggregates in the same volume instead of fine aggregates. The cube compressive strength test and flexural strength test of rubber aggregate concrete were carried out. According to the mechanical properties, the optimum rubber particle size was determined to be 40 mesh. Then the axial compression test and four-point bending test were carried out on the rubber aggregate concrete beam with 40 mesh rubber particle size and 0% rubber content of 10 ~ 10 ~ 20% and 40% rubber aggregate concrete beam, and the experimental phenomena and test results were analyzed. The experimental parameters of concrete with different rubber content are introduced into the finite element software for nonlinear analysis. Finally, the stress-strain results and fatigue performance parameters are introduced into the fatigue analysis software to analyze its fatigue performance. The effect of rubber content on fatigue life of rubber aggregate concrete beams was studied. The main research work includes the following aspects: 1. The best rubber particle size was determined by cube compressive strength test and flexural strength test of rubber concrete specimens with rubber diameter of 5 mesh and 20 mesh of 20 mesh and rubber content of 0 10% and 40% of rubber content. The axial compression test and four-point bending test of rubber aggregate concrete beams with various rubber content were carried out. The experimental phenomena and test results of each rubber aggregate concrete beam were compared. The effect of rubber content on the mechanical properties of rubber aggregate concrete was studied. The nonlinear analysis of rubber aggregate concrete beams with different rubber content was carried out by finite element software, and the crack development of rubber aggregate concrete beams under bending was studied in combination with the experimental phenomena. According to the results of nonlinear analysis, the cracking load, ultimate load and crack resistance of rubber aggregate concrete beams with different rubber content are studied. It provides a theoretical basis for the analysis of the failure process of rubber aggregate concrete beams during the failure stage. The stress-strain results obtained from nonlinear analysis and the fatigue performance parameters are introduced into the fatigue analysis software to analyze their fatigue properties. The calculated results are fitted and the S-N curves of concrete beams with different rubber content are obtained. The fatigue life calculation results and S-N curves of concrete beams with different rubber content were analyzed and the relationship between fatigue life of rubber aggregate concrete beams and rubber content and stress level was found out.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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本文編號(hào)：2136015