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Rheological-dynamical model of concrete and its application on RC beams
Mechanics of Time-Dependent Materials ( IF 2.5 ) Pub Date : 2020-11-18 , DOI: 10.1007/s11043-020-09476-8
Dragan D. Milašinović , Danica Goleš , Aleksandar Pančić , Arpad Čeh

An improved analytical model based on rheological-dynamical analogy (RDA) is briefly explained and used for the analysis of concrete cylinders under compression. The approach involves standard mechanical properties such as compressive strength, elastic modulus, concrete density and Poisson’s ratio for the prediction of both the ascending and the descending branch of the stress–strain curve. Our own experimental data for arbitrarily selected high strength concrete with high deformability was analyzed. Further, the validity of the RDA model is checked against tests of other authors for one normal concrete and for six recycled aggregate concrete mixtures. To demonstrate the capabilities of the improved model, using analytically established stress–strain relations for analyzed samples, the moment-curvature relations and ductility of reinforced concrete beams in bending were numerically examined. The analysis showed that the ductile behavior of beams made of concrete with recycled aggregate can be achieved by limiting the reinforcement ratio to 0.01 if the recycled concrete aggregate is used and to 0.02 for recycled brick aggregate.



中文翻译:

混凝土的流变-动力学模型及其在RC梁上的应用

简要解释了一种基于流变-动态类比(RDA)的改进分析模型,并将其用于受压混凝土圆柱体的分析。该方法涉及标准机械性能,例如抗压强度,弹性模量,混凝土密度和泊松比,用于预测应力-应变曲线的上升和下降分支。我们对任意选择的高强度高变形混凝土的试验数据进行了分析。此外,对照其他作者针对一种普通混凝土和六种再生骨料混凝土混合物进行的测试,对RDA模型的有效性进行了检验。为了证明改进模型的功能,使用分析建立的应力-应变关系来分析样品,数值研究了钢筋混凝土梁弯曲时的弯矩曲率关系和延性。分析表明,如果使用再生混凝土骨料,则将补强比限制为0.01,对于再生砖骨料,将补强比限制为0.02,可以实现具有再生骨料的混凝土梁的延性。

更新日期:2020-11-18
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