Abstract:Here, in order to establish a calculation method of compressive stiffness recovery factor wc for describing cracking-closing behavior of concrete under cyclic loading in the concrete damaged plasticity (CDP) model, firstly, the relationship between exponential softening stress and cracking displacement was established based on the cracking fracture energy of concrete, and then the existing calculation models for concrete tensile and compressive damage parameters were evaluated contrastively to choose their calculation models suitable for structural analysis of reinforced concrete (RC) structure, and the calculation model for wc was established based on θ-th power of the ratio of tensile residual fracture energy density to cracking fracture energy density.In this model, effects of element characteristic length and concrete tensile damage parameter on wc were considered, and the value range of the stiffness recovery correction parameter θ was discussed.However, wc could be only defined as a certain constant in CDP model.To overcome this limitation, the severely damaged RC joint member under cyclic loading was taken as the study object, based on the statistical relation between the existing concrete crack features and tensile damage levels, a model simplification handling method was proposed.The RC joint member was divided into two parts of slight damage and damage-failure zones.Several groups of RC joint members under cyclic loading were simulated numerically and their results were compared with test data to verify the correctness of the proposed method and the feasibility of the model simplification handling method.
李晓琴,张田. 循环荷载下混凝土开裂-闭合行为计算方法研究[J]. 振动与冲击, 2021, 40(9): 254-263.
LI Xiaoqin, ZHANG Tian. Calculation method of cracking-closing behaviour of concrete under cyclic loading. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(9): 254-263.
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