【摘要】：混凝土是工程常用材料,廣泛應用于土木工程結構和核電站等諸多領域。對混凝土材料的力學性能及耐久性進行分析具有重要理論研究意義和實用價值。本文采用實驗研究與有限元分析相結合的方法,對橡膠集料混凝土材料的基本力學性能以及橡膠集料混凝土梁的疲勞性能進行分析。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骨料,按照水灰比0.45制備橡膠集料混凝土梁試件,進行橡膠集料混凝土的立方體抗壓強度試驗和抗折強度試驗,根據力學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行軸壓試驗和四點彎曲試驗,對試驗現象和試驗結果進行分析,將不同橡膠摻量混凝土的實驗參數帶入有限元軟件中進行非線性分析;最后將應力應變結果以及疲勞性能參數導入疲勞分析軟件中分析其疲勞性能,研究不同橡膠摻量對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行立方體抗壓強度試驗和抗折強度試驗確定最佳橡膠粒徑;對多種橡膠摻量的橡膠集料混凝土梁進行軸壓試驗和四點彎曲試驗,通過對各橡膠集料混凝土梁試驗現象以及試驗結果的比較,研究了橡膠摻量對橡膠集料混凝土力學性能的影響;2.通過有限元軟件對不同橡膠摻量的橡膠集料混凝土梁進行非線性分析,結合試驗現象研究了橡膠集料混凝土梁受彎的裂縫發(fā)展狀況;根據非線性分析計算結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程的分析提供理論基礎;3.將非線性分析得出的應力應變結果以及疲勞性能參數導入疲勞分析軟件分析其疲勞性能,對計算結果進行了擬合,得出了不同橡膠摻量混凝土梁的S—N曲線;對不同橡膠摻量混凝土梁的疲勞壽命計算結果和S—N曲線進行分析,找出了橡膠集料混凝土梁的疲勞壽命與橡膠摻量和應力水平之間的關系。
[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.
【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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本文編號：2136015