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为了研究低屈服点钢材LYP160的本构行为并提出循环本构模型,进行了此种钢材的循环加载试验,研究其受力性能,包括单调受力性能、滞回性能、破坏模态及耗能能力等。利用Ramberg-Osgood模型,得到材料骨架曲线。采用Chaboche模型,确定了循环本构模型的关键参数,利用此模型预测低屈服点钢板剪力墙结构的滞回行为。结果表明:低屈服点钢材LYP160虽然初始屈服点低,但其抗震性能较好,延性约为普通钢材及高强度钢材的2.3~2.8倍;能量耗散系数在3.6左右,耗能能力明显高于普通钢材和高强度钢材,提高幅度约30%,LYP160钢材具有显著的单调及循环强化性能,具有较高的承载能力,其滞回特性包含了各向同性强化与随动强化两种特征,其中各向同性强化行为具有控制作用,这与普通钢材及高强度钢材有明显的区别。
In order to study the constitutive behavior of the LYP160 steel with low yield point and to propose a cyclic constitutive model, cyclic loading tests of the steel were carried out to study the mechanical properties of the steel, including monotonous force, hysteretic behavior, failure mode and energy dissipation Ability and so on. The Ramberg-Osgood model was used to obtain the material skeleton curve. The Chaboche model was used to determine the key parameters of the cyclic constitutive model. The model was used to predict the hysteretic behavior of shear wall structures with low yield point. The results show that the low yield point steel LYP160 has better anti-seismic performance than the ordinary steel and high-strength steel, although the initial yield point is low, the ductility is about 2.3-2.8 times that of ordinary steel and high-strength steel; the energy dissipation coefficient is about 3.6, Ordinary steel and high-strength steel, an increase of about 30%, LYP160 steel has a significant monotonic and cyclic strengthening properties, with high carrying capacity, the hysteresis characteristics include isotropic strengthening and follow-up strengthening of the two characteristics, including Isotropic strengthening behavior has a controlling role, which is obviously different from ordinary steel and high-strength steel.