论文部分内容阅读
采用消(耗)能元件的结构在遭受地震作用时,元件芯材首先屈服进入塑性阶段,利用其滞回变形消耗地震输入能量,保护主体结构,元件芯材本构关系的数值模拟是对采用消(耗)能元件结构进行抗震分析与设计的基础。为更真实地模拟结构消(耗)能元件芯材在单调和循环荷载下的本构响应,更准确地对采用消(耗)能元件结构进行结构弹塑性地震响应分析,对常用作消(耗)能元件芯材的日本高延性钢材SN490B的单调、循环加载本构及循环骨架曲线进行了数值模拟,包括:采用Esmaeily-Xiao二次流塑性模型模拟材料在单调荷载作用下弹性段、屈服段、强化段和二次流塑段4个阶段;采用混合强化模型模拟材料循环荷载作用下的本构响应,运用大型通用有限元软件ABAQUS结合数值模拟参数对16种不同循环加载制度下的循环加载试验进行模拟,并与试验结果进行对比;采用Ramberg-Osgood模型、无量纲化的Ramberg-Osgood模型及两段式模型模拟循环骨架曲线。研究结果表明:所采用数学模型可以较好地模拟SN490B钢材单调、循环加载本构响应及循环骨架曲线,数值模拟与试验结果拟合较好。
In the structure subjected to seismic energy dissipation, the element core material first enters into the plastic phase and uses its hysteretic deformation to dissipate the seismic input energy and protect the main structure. The numerical simulation of the constitutive relation of the element core material is based on the adoption of Consumption (consumption) can element structure seismic analysis and design basis. In order to more truly simulate the constitutive elastic-plastic seismic response of structure core elements under monotonous and cyclic loading, the structure elastic-plastic seismic response analysis using dissipative (energy dissipating) element structure is more accurate. The monotonous, cyclic loading constitutive model and cyclic skeleton curve of Japan high ductility steel SN490B with element core material were numerically simulated, including: using Esmaeily-Xiao secondary plasticity model to simulate the elastic section under monotonic loading, yielding Section, reinforced section and secondary flow plastic section. The mixed reinforced model was used to simulate the constitutive response under the cyclic loading of materials. The cycle of 16 kinds of cyclic loading system was simulated by the large general finite element software ABAQUS combined with numerical simulation parameters. Loading test was carried out and compared with the test results. The Ramberg-Osgood model, the non-dimensional Ramberg-Osgood model and the two-stage model were used to simulate the cyclic skeleton curve. The results show that the mathematical model can simulate monotonically, cyclically loaded constitutive response and cyclic skeleton curve of SN490B steel, and the numerical simulation is in good agreement with the experimental results.