Evaluation of the inelastic demand of structures subjected to multiple ground motions
Evaluation of the inelastic demand of structures subjected to multiple ground motions
复制标题
多次地面运动下结构的非弹性需求评估
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Georgiana Ionică
中科院分区：
文献类型：
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作者：
Mihail Iancovici;Georgiana Ionică
在当前的抗震设计格式中，确定实际地震荷载的关键问题是行为系数。它解释了结构系统在强地面运动下可能发展的所有耗散机制，但尚未得到足够明确的阐述。它对应于与极限状态（即生命安全）相关的性能水平，与具有规定峰值地面加速度的地震地面运动的100年平均重现期相关。本文研究了重复的Vrancea强地震动对行为因子和相关参数的影响，这些行为因子和相关参数解释了由于非弹性反应引起的循环结构劣化。进行了大量的综合分析、非线性响应分析和基于能量平衡的分析，并对由刚度退化的弯曲控制的非弹性单自由度系统的行为系数进行了估计。使用Bozorgnia和Bertero（2001）改进的损伤指数研究了行为因素与损伤水平之间的相关性。结果表明，布加勒斯特的Vrancea型多地震动可能会导致结构的力和漂移需求的重要增加，而这通常是不考虑的。
In the current seismic design format, the key issue in establishing realistic seismic loads is the behavior factor. It accounts for all the dissipative mechanisms that a structural system may develop under a strong ground motion, however not clearly enough stated yet. It corresponds to the performance level associated to the ultimate limit state (i.e. life safety), related to a 100 years mean return interval of earthquake ground motion with a prescribed peak acceleration of ground. The paper investigates the effect of repeated Vrancea strong ground motions on the behavior factors and the related parameters that accounts for cyclic structural deterioration due to inelastic response. A large number of integrated analyses, nonlinear response analyses and energy balance-based analyses were carried out and estimates were made on the behavior factors for inelastic SDOF systems controlled by flexure with stiffness degradation. The correlation between behavior factors and damage level are investigated, using the Bozorgnia and Bertero (2001), improved damage index. It is shown that multiple ground motion of Vrancea type for Bucharest, may lead to an important increase of force and drift demand of structures that usually is not taken into account.