Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions
Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions
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DOI：
10.1007/s10518-016-9898-3
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发表时间：
2016-03
影响因子：
4.6
通讯作者：
A. S. Tzimas;G. Kamaris;T. Karavasilis;C. Galasso
中科院分区：
文献类型：
--
作者：
A. S. Tzimas;G. Kamaris;T. Karavasilis;C. Galasso
评估了后张自定心抗弯框架和粘滞阻尼器在降低近断层区域钢结构倒塌风险和改善残余位移性能方面的潜力。为此，设计了一个原型钢结构建筑，使用不同的抗震框架，即：抗弯框架（MRF）;带粘滞阻尼器的MRF; SC-MRF;带粘滞阻尼器的SC-MRF。框架在OpenSees中建模，其中考虑了材料和几何非线性以及刚度和强度退化。一个数据库的91个近断层，脉冲状的地面运动与不同的脉冲周期进行增量动力分析（IDA），其中每个地面运动的比例，直到崩溃发生。根据地震动强度和速度脉冲周期的函数关系，计算了倒塌概率和超过不同剩余层间位移阈值的概率。IDA的结果，然后结合概率地震危险性分析模型，占近断层方向性，评估和比较倒塌的风险和残留的漂移性能的框架。本文强调了在近源中结合后张拉和附加粘性阻尼技术的好处。特别是，SC-MRF与粘滞阻尼器被发现，以实现显着降低倒塌的风险和概率的残余层位移阈值相比，MRF。
The potential of post-tensioned self-centering moment-resisting frames (SC-MRFs) and viscous dampers to reduce the collapse risk and improve the residual drift performance of steel buildings in near-fault regions is evaluated. For this purpose, a prototype steel building is designed using different seismic-resistant frames, i.e.: moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as stiffness and strength deterioration. A database of 91 near-fault, pulse-like ground motions with varying pulse periods is used to conduct incremental dynamic analysis (IDA), in which each ground motion is scaled until collapse occurs. The probability of collapse and the probability of exceeding different residual story drift threshold values are calculated as a function of the ground motion intensity and the period of the velocity pulse. The results of IDA are then combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess and compare the collapse risk and the residual drift performance of the frames. The paper highlights the benefit of combining the post-tensioning and supplemental viscous damping technologies in the near-source. In particular, the SC-MRF with viscous dampers is found to achieve significant reductions in collapse risk and probability of exceedance of residual story drift threshold values compared to the MRF.