【作者】 戎贤；

【导师】 王铁成；

【作者基本信息】 天津大学 ， 结构工程， 2005， 博士

【摘要】 钢筋混凝土的开裂问题一直以来都是国内外专家学者关注的课题之一。随着《混凝土结构设计规范》(GB50010-2002)的颁布实施,高强度钢筋(HRB400)在混凝土结构中得到广泛使用。但是,使用高强度钢筋可能会造成钢筋混凝土构件出现较大裂缝或挠度而无法满足正常使用极限状态的要求。使用高强钢筋的混凝土结构在正常使用阶段能否满足结构适用性和耐久性的要求,是工程应用关注的问题,研究高强钢筋混凝土结构的工作性能具有重要的理论和工程实际意义。本论文对HRB400高强钢筋混凝土T形截面梁在集中荷载和均布荷载作用下的受弯、剪裂缝及挠度进行研究。本文对24根高强度钢筋混凝土梁进行了抗弯、抗剪性能试验研究,分析了加载方式、混凝土强度、钢筋强度对钢筋混凝土梁的开裂、裂缝宽度、挠度等的影响,研究了梁在正常使用阶段的适用性问题。在试验研究的基础上,对钢筋混凝土梁进行了非线性有限元的分析。建立有限元模型,利用有限元分析软件ANSYS模拟试验过程,同时对数值分析结果和试验结果进行了比较,结果表明,分析结果与试验结果吻合较好。论文利用试验资料和本试验的结果,提出了荷载作用下采用高强度钢筋的混凝土结构的裂缝宽度计算公式。同时,用本文建议的计算公式与国内外其它计算公式进行了验算和比较,结果表明,本文建议的裂缝宽度计算公式与试验结果吻合较好,可以用于定量地计算裂缝宽度。更多还原

【Abstract】 The problem of crack of reinforced concretes has always been paid attention to bythe learners in the world. Since the Code for Design of Concrete Structures(GB50010-2002) was carried out, high strength reinforced bar (HRB400) is usedwidely in concrete structures. High strength reinforced bar may lead to wider crackand larger deflection, and this will cause the need of serviceability limit state can’t bemet. Whether high strength reinforced concrete structures can reach the agreement ofthe adaptability and duration or not, is cared for in practical project. So the researchon the performance of high strength reinforced concrete structures is meaningful. Inthe paper, the crack by bending and shear and the deflection of T-shaped beams withHRB400 under concentrated and distributed loading were studied. In the paper, the bending and shear behavior of 24 high strength reinforcedconcrete beams were tested. The effects of the method of loading, concrete andreinforced bar strength on the crack width and deflection were analyzed, and theproblem of adaptability of reinforced concrete beams was discussed, too. At the basis of the experiment, the reinforced concrete beams were analyzed bythe nonlinear finite element method. The finite element model were proposed, and theprocess of the experiment were simulated with the finite element software ANSYS.From the comparison of the numerical results and experimental ones, it can be seenthat the numerical results show excellent agreement with the experimental ones. The formulation that can be used to calculate the crack width of high strengthreinforced concrete was proposed in the paper. Compared the formulation suggestedin the paper with the others, it can be seen that the formulation suggested in the papercan show excellent agreement with the experimental results. It can be used to computethe crack width.更多还原