面向可恢复能力和性价比的结构减震阻尼器类型择优

现有的减震结构减震率和阻尼器性能评价方法限于评价指标不够丰富且未考虑主余震及结构可恢复能力等因素具有较大的局限性。通过构建“主震-余震-余震”的时程序列反映主余震效应,使用结构能量损伤指数和多种减震率评价指标量化阻尼器性能,基于考虑主余震效应、时间成本和经济投入的修复定额提出可恢复能力计算方法。在此基础上提出减震结构阻尼器性价比评价方法,并实现黏滞阻尼器、防屈曲支撑和金属阻尼器等不同阻尼器类型的对比和择优。通过算例对以上指标和方法进行验证,结果表明:考虑结构可恢复性并对减震结构损伤构件进行修复的工况能够充分发挥阻尼器性能,性价比远高于仅考虑主震的结构;在给定目标减震率下,虽然黏滞阻尼器的减振率优于防屈曲支撑和金属阻尼器,但3种阻尼器综合性价比排序为:金属阻尼器、防屈曲支撑和黏滞阻尼器,按性价比选择阻尼器更全面客观。

Type optimal selection of structural dampers oriented to seismic resilience and cost performance

The current methods for evaluating the damping rate and the performance of dampers are limited to the factors such as insufficient evaluation indexes,not considering the main aftershocks and the structural resilience.The time sequence of"main shock-aftershock-aftershock"is constructed to represent the main aftershock effect.The energy damage index and various damping rate evaluation indexes are used to quantify the performances of different dampers.Based on the repair quota considering the main aftershock effect,time cost and economic input,a resilience capacity calculation method is proposed.On this basis,a cost performance evaluation method of seismic dampers is proposed,and the comparison and optimization of different types of dampers,such as viscous dampers,buckling braces and metal dampers,are realized.The above index and methods are verified by an example.The results show that the performance of dampers can be fully utilized when considering the structural resilience capacity and repairing the damaged components,and the cost performance ratio is much higher than that of structures only considering the main shock.For the given target damping rate,although the damping rate of viscous dampers is better than that of buckling braces and metal dampers,the comprehensive cost performance ratio of the three dampers is arranged as follows:metal dampers,buckling braces and viscous dampers,and the selection of dampers according to the cost-performance ratio is more comprehensive and objective.