组合减震技术在某医院建筑中的应用研究
Study on the Application of Combined Energy Dissipation Technology in a Hospital Building
本文以某医院建筑为研究对象,分别对不同减震方案(BRB、VFD、BRB+VFD)进行设防地震作用下的弹性时程计算,选取层间位移角、基底剪力和附加阻尼比为评价指标进行比选,择优采用BRB+VFD组合减震方案。对消能器减震效果进行参数影响规律分析,结果表明:优化VFD力学参数和BRB布置位置,结构附加阻尼比可提高超12%。设防地震作用下,结构耗能作用主要由VFD发挥,VFD耗能占结构总耗能超过30%。最后对本工程进行弹塑性时程分析,结果表明:罕遇地震作用下,减震装置耗能机制良好,相较于无控模型,组合减震结构塑性耗能减小约50%。结构X、Y向最大层间位移角分别为1/109、1/110,小于限值要求。结构整体轻微损伤,少部分构件中度损坏,满足性能目标要求。
Taking a hospital building as the research context, this study performs elastic time-history analyses on various seismic energy dissipation schemes—namely BRB, VFD, and their combination (BRB+VFD)—under moderate earthquake conditions. Story drift, base shear, and additional damping ratio are adopted as evaluation metrics for comparison, leading to the recommendation of the BRB+VFD composite scheme. A parametric analysis is subsequently conducted to investigate the influence of energy dissipation devices. The results indicate that optimizing VFD mechanical parameters and BRB placement can enhance the structural additional damping ratio by over 12%. Under moderate earthquakes, VFDs contribute predominantly to energy dissipation, accounting for more than 30% of the total structural energy dissipation. Finally, elastic-plastic time-history analysis is carried out. The findings reveal that under major earthquakes, the devices exhibit favorable energy dissipation behavior. Compared to the uncontrolled model, the combined scheme reduces plastic energy dissipation by approximately 50%. The maximum story drifts in the X and Y directions are 1/109 and 1/110, respectively, satisfying code limits. Overall, the structure sustains minor damage with only a few members moderately damaged, thereby fulfilling the prescribed performance objectives.
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