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自复位防屈曲支撑(SCBRB)由复位系统和耗能内芯组成,由于其综合了自复位体系和防屈曲支撑的优点,经过合理设计可兼具良好的复位及耗能能力,因此更有利于实现可恢复的结构这一抗震目标。若主体结构保持弹性,则自复位防屈曲支撑框架(SCBRBF)的简化恢复力模型为双线性弹性+双线性弹塑性合成的三线性滞回模型。等效线性化方法的精度对于等效阻尼比和等效刚度的计算方式比较敏感,不同的恢复力模型以相同的等效线性化方法计算精度也不相同,因此应根据具体情况对结果进行修正,以提高计算精度和结构的安全性。首先,分别对两种等效线性化方法计算自复位防屈曲支撑结构地震位移的平均误差及变异系数展开了参数研究。结果表明:由于SCBRBF的非线性和塑性程度均低于理想弹塑性结构,因此与理想弹塑性结构相比,用两种等效线性化方法评估自复位结构地震位移反应时,尤其在周期大于0.3 s时,精度显著提高;等概率幅值平均等效线性化方法由于考虑了所有位移对等效阻尼比和等效刚度的贡献,因此比割线刚度法更为精确。其次,根据分析结果给出了不同等效线性化方法在计算SCBRBF时的修正系数。最后,根据阻尼比函数得到各个参数对阻尼比的影响规律,并给出最佳延性比。
The self-resetting anti-buckling support (SCBRB) is composed of a reset system and an energy-consuming inner core. Because it combines the advantages of a self-resetting system and a buckling-restrained support, a reasonable design can provide both good reset and energy dissipation capabilities. Realize the earthquake-resistant goal of a recoverable structure. If the main structure remains elastic, the simplified restoring force model of self-resetting anti-buckling support frame (SCBRBF) is a bilinear elastic + bilinear elastic-plastic composite three-linear hysteresis model. The accuracy of the equivalent linearization method is sensitive to the calculation of the equivalent damping ratio and the equivalent stiffness. The calculation accuracy of different restoring force models with the same equivalent linearization method is not the same, so the results should be corrected according to the specific situation To improve the accuracy and structural safety of the calculation. First, the parameters of the two methods are calculated by calculating the average error and the coefficient of variation of the seismic displacement of the self-repairing anti-buckling support structure. The results show that: due to the nonlinearity and plasticity of SCBRBF are lower than the ideal elasto-plastic structure, compared with the ideal elasto-plastic structure, two equivalent linearization methods are used to evaluate the seismic displacement response of the self-resetting structure, especially when the period is greater than 0.3. At s, the accuracy is significantly improved; the equal-magnitude average equivalent linearization method is more accurate than the secant stiffness method because it considers the contribution of all displacements to the equivalent damping ratio and the equivalent stiffness. Secondly, according to the analysis results, the correction coefficients of different equivalent linearization methods in the calculation of SCBRBF are given. Finally, according to the damping ratio function, the influence of each parameter on the damping ratio is obtained, and the optimal ductility ratio is given.