Energy dissipation and performance assessment of double damped outriggers in tall buildings under strong earthquakes
Energy dissipation and performance assessment of double damped outriggers in tall buildings under strong earthquakes
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强震下高层建筑双阻尼支腿耗能及性能评估
DOI：
10.1002/tal.1554
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
R. Nijsse
中科院分区：
文献类型：
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作者：
M. Morales;G. Turan;O. Dursun;R. Nijsse
使用一组装有油粘性阻尼器的伸出臂，根据加载条件的不同，高层建筑的阻尼比增加了约6-10%。但是，如果再增加一组外伸出臂，这个比例是否会进一步提高？这个额外的套件也应该包括阻尼器吗？为了回答这些问题，研究了几种用于高层建筑的双阻尼支腿结构，并将其与位于建筑总高度(h) 0.7的最佳设计的单阻尼支腿结构进行了比较。利用自由振动，确定了双支腿结构，将阻尼增加到等于基于单的最优比率。接下来，选择的结构受到8级地面运动的几个级别，以比较它们在临界激励下避免损坏的能力。最后，一个简化的经济分析强调了每个优化配置在成本节约方面的优势。结果表明，在本研究的范围内，与单一阻尼支腿方案相比，将0.5h的阻尼支腿与0.7h的常规支腿相结合，可以更有效地降低滞回能比，并且在经济上可行。此外，高层建筑的双阻尼支腿结构展示了更广泛的最佳组合，为高层建筑的设计提供了灵活性。
The use of a single set of outriggers equipped with oil viscous dampers increases the damping ratio of tall buildings in about 6–10%, depending on the loading conditions. However, could this ratio be further increased by the addition of another set of outriggers? Should this additional set include dampers too? To answer these questions, several double damped outrigger configurations for tall buildings are investigated and compared with an optimally designed single damped outrigger, located at elevation 0.7 of the total building's height (h). Using free vibration, double outrigger configurations increasing damping up to a ratio equal to the single‐based optimal are identified. Next, selected configurations are subjected to several levels of eight ground motions to compare their capability for avoiding damage under critical excitations. Last, a simplified economic analysis highlights the advantages of each optimal configuration in terms of cost savings. The results show that, within the boundaries of this study, combining a damped outrigger at 0.5h with a conventional outrigger at 0.7h is more effective in reducing hysteretic energy ratios and economically viable if compared with a single damped outrigger solution. Moreover, double damped outrigger configurations for tall buildings exhibit broader display of optimal combinations, which offer flexibility of design to the high‐rise architecture.