基于雨流计数法的屈曲约束支撑的塑性变形研究

Study on plastic deformation of buckling restrained brace based on rain flow counting method

屈曲约束支撑(buckling restrained brace,简称BRB)具有滞回曲线稳定饱满的优点,近年来已被广泛应用于工程设计中。从3组BRB不同加载制度所得的滞回曲线出发,建立了BRB的Bouc-Wen数值模型,在输入地震波后提取滞回曲线验证了数值模型的准确性。根据雨流计数法对损伤统计的原理,编写计算程序后对单自由度BRB钢框架计算模型所受到的地震损伤进行了统计,通过等效塑性应变理论验证了采用数值模型以雨流计数法统计BRB塑性变形的准确性。

Buckling restrained brace(BRB)has been widely used in engineering design in recent years because of its stable and full hysteresis curves.The Bouc-Wen numerical model of BRB was established based on hysteresis curves obtained by three groups of different loading systems.hysteresis curves were extracted after the input of seismic waves to verify the accuracy of the numerical model.According to the principle of rain flow counting method for damage statistics,a calculation program was written to calculate the seismic damage suffered by the calculation model of steel frame with single freedom BRB.The accuracy of the numerical model and rain flow counting method for calculating the plastic deformation of BRB was verified by equivalent plastic strain theory.