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对不同强度等级结构钢材进行了滞回性能试验研究,设置了等幅升幅、等幅交替和拉伸循环等不同加载路径以研究钢材在地震随机作用下的行为特性。考察了钢板板厚、屈服强度以及加载路径等参数对钢材滞回性能的影响,结果表明,在有限应变条件下,同种牌号不同板厚钢材的滞回性能差异很小,实际屈服强度接近的不同牌号钢材的滞回性能十分接近,不同加载路径下的滞回环有差异但幅度不大,结构钢材具有非完全Masing特性。在此基础上,给出了利用钢材循环加载骨架曲线确定不同应变幅值范围内Ramberg-Osgood方程相关参数的方法,进而建立了滞回环参数随应变幅变化的结构钢材滞回模型,此模型能反映屈服强度以及加载路径等的影响。与Q460钢材滞回试验进行比较,验证了该滞回模型的适用性。
The hysteretic behavior of steels with different strength grades was studied. Different loading paths such as constant amplitude increase, constant amplitude alternation and extension cycles were set up to study the behavior of steels under random earthquake. The effects of parameters such as plate thickness, yield strength and loading path on the hysteretic behavior of the steel were investigated. The results show that the hysteretic behavior of the same plate with different plate thicknesses is very small and the actual yield strength is close under finite strain Hysteresis properties of different grades of steels are very close, but the hysteresis loops are different but not large in different loading paths. Structural steels have incomplete Masing characteristics. On this basis, the method to determine the relevant parameters of Ramberg-Osgood equation in different strain amplitudes is given by using the cyclic load skeleton curve of steel, and the hysteretic model of structural steel with varying hysteresis loop parameters is established. Reflect the yield strength and loading path and so on. Compared with the Q460 steel hysteresis test, the applicability of this hysteretic model is verified.