U型金属阻尼器受力性能和数值模拟分析方法研究

首先收集了17个U型金属阻尼器的试验数据,并对采用不同类型钢材的U型金属阻尼器的面内受力性能进行了分析和比较。在此基础上,研究了分别适用于构件层次分析和结构层次分析的U型金属阻尼器精细有限元模型和简化有限元模型的建模方法。结果表明:采用实体单元建立的精细有限元模型,既可较准确地模拟出U型金属阻尼器的荷载-位移滞回关系,又可以较好地反映其微观损伤模式;建议的U型金属阻尼器初始刚度和屈服荷载计算公式预测值与试验结果较接近,且偏于安全,可用于简化模型骨架参数的确定;采用建议的简化有限元模型分析得到的试件荷载-位移滞回曲线与试验结果吻合较好。

Study on mechanical performance and numerical simulation analysis method of U-shaped metal damper

Firstly, the experimental data of 17 U-shaped metal dampers were collected, and the in-plane mechanical performance of this type of dampers with different kinds of steel was analyzed and compared. Then the refined and simplified finite element modeling methods of U-shaped metal damper, which are suitable for the analysis on the member level and overall structure level respectively, were studied based on the collected data. The results indicate that: the refined finite element model established by solid element can simulate the load-displacement hysteresis relationship accurately, and also reflect the micro-damage mode of the U-shaped metal damper;the predicted values of initial stiffness and yielding load calculated by the proposed formulas are close to the test results, and relatively safer compared with the test results, the proposed formulas can be used in the determination of the skeleton parameters of the simplified model;the load-displacement hysteresis curves of the specimen calculated by the simplified finite element model coincide well with the test results.