基于变形模型的钢筋混凝土结构损伤计算

Y. Blikharskyy
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摘要

本文介绍了钢筋混凝土损伤梁的理论研究结果。研究了直径为20mm的A500C钢钢筋径向显微硬度的变化规律,确定了热强化层厚度。确定了直径为20mm的A500C钢筋的热强化钢层厚度约为3mm。结果表明,该层的强度特性比钢筋芯材高50%以上,而塑性特性较低。该工作的目的是确定钢筋混凝土结构的强度和变形能力,而不损坏钢筋和在损坏情况下。确定钢筋物理特性的变化对钢筋混凝土结构损伤的影响,根据有效规范,按照变形模型进行计算。为实现本文的工作目标,根据变形模型和有效规范对钢筋混凝土梁进行了理论计算。该技术使用混凝土和钢筋的非线性应变图,并基于迭代方法。按照研究方案计算了3个梁样。其中为未破损对照样品,单载配筋φ 20 mm - BC-1;∅20 mm钢筋,破损约40%,钢筋- BD-2的物理力学性能不变;∅20 mm钢筋,破损约40%,钢筋- BD-3的物理力学性能不变。建立了钢筋物理力学特性变化对损伤钢筋混凝土梁承载力的影响。
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Calculation of damage RC constructions according to deformation model
This article presents results of a theoretical study of reinforced concrete beams with damaged reinforcement. The change of micro-hardness of a reinforcing rebar’s with a diameter of 20 mm of A500C steel in the radial direction is investigated and the thickness of the heat-strengthened layer is established. It is established that the thickness of the thermo-strengthened steel layer of the reinforcing bar with a diameter of 20 mm of A500C is approximately 3 mm. It is shown that the strength characteristics of this layer are on 50% higher compared to the core material of the rebar, while the plasticity characteristics are lower. The aim of the work is to determine the strength and deformability of reinforced concrete structures without damaging the reinforcement and in case of damage. Determining the impact of changes in the physical characteristics of reinforcement on the damage of reinforced concrete structures, according to the calculation to the valid norms, in accordance with the deformation model. To achieve the goal of the work, theoretical calculations of reinforced concrete beams were performed according to the deformation model, according to valid norms. This technique uses nonlinear strain diagrams of concrete and rebar and is based on an iterative method. According to the research program 3 beam samples were calculated. Among them were undamaged control sample with single load bearing reinforcement of ∅20 mm diameter – BC-1; sample with ∅20 mm reinforcement with damages about 40% without changes in the physical and mechanical properties of reinforcement – BD-2 and sample with ∅20 mm reinforcement with damages about 40% with changes in the physical and mechanical properties of reinforcement – BD-3. The influence of change of physical and mechanical characteristics of rebar’s on bearing capacity of the damaged reinforced concrete beams is established.
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