为进一步探讨材料本构行为对构件及结构受力性能的影响,首先,进行了LYP100低屈服点钢材的本构关系试验研究,分析此材料的单调性能、滞回性能、耗能能力及循环本构模型等。在此基础上,全面对比LYP100和LYP160低屈服点钢材、普通钢材(Q345B)及高强度钢材(Q460D)的本构关系。最后,通过对比不同钢材的循环本构模型以及理想弹塑性模型对结构构件滞回行为的预测结果,深入研究材料本构关系对构件及结构的重要影响。结果表明:低屈服点钢材单调以及循环强屈比均在2.0~3.0以上,是普通钢材以及高强度钢材的2.0倍~3.0倍。同时,低屈服点钢材具有更好的延性和耗能能力。由于低屈服点钢材具有显著的各向同性强化行为,其采用循环本构模型和理想弹塑性模型的计算结果差异更大。因此,在结构计算分析中,需要根据所采用的钢材选取适当的本构关系模型。 In order to further investigate the effect of constitutive behavior of material on the mechanical properties of structural members, the constitutive relationship of LYP100 steel with low yield point was studied. The monotonic, hysteretic, energy dissipation and cyclic Model and so on. On this basis, the constitutive relations of LYP100 and LYP160 low yield point steel, ordinary steel (Q345B) and high strength steel (Q460D) were compared fully. Finally, by comparing the cyclic constitutive models of different steel materials and the prediction of the hysteretic behavior of structural members by the ideal elastoplastic model, the important influence of material constitutive relations on the components and structures is deeply studied. The results show that the monotonous and cyclic strength ratio of low yield point are both 2.0 ~ 3.0, which is 2.0 times to 3.0 times that of ordinary steel and high strength steel. At the same time, low yield point steel has better ductility and energy consumption. Due to the significant isotropic strengthening behavior of low yield point steels, the calculated results of the cyclic constitutive model and the ideal elasto-plastic model are significantly different. Therefore, in the structural calculation and analysis, we need to select the appropriate constitutive model according to the steel used.