Response of nonlinear single-degree-of-freedom structures to random acceleration sequences
Response of nonlinear single-degree-of-freedom structures to random acceleration sequences
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DOI：
10.1016/j.engstruct.2011.01.002
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发表时间：
2011-04
影响因子：
5.5
通讯作者：
A. Moustafa;I. Takewaki
中科院分区：
文献类型：
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作者：
A. Moustafa;I. Takewaki
目前的抗震规范规定设计地震荷载为单一事件。然而，结构可能在短时间内经历多次地面加速度。最近几次地震的证据证实了这种情况。例如，2004年新泻地震由两个加速度序列组成。由于非弹性变形的累积，重复序列的地震比单一的普通地震对结构造成的破坏更大。然而，目前关于重复加速序列的信息有限。本文提出了一个简单的随机模型来表示重复的加速度序列。随后，该模型被用于调查的非线性单自由度（SDOF）结构的反应随机地震重复序列。地面加速度被表示为由重复特征的包络函数调制的平稳高斯随机过程。结构的反应是量化的输入和滞回耗能，延性需求，损伤指标和失效概率。给出了非线性单自由度系统对加速度序列响应的数值模拟。
Current seismic codes specify design earthquake loads as single events. The structure, however, may experience multiple ground accelerations in a short period of time. The evidence from recent earthquakes confirms this scenario. For instance, the 2004 Niigata earthquake consisted of two acceleration sequences. An earthquake of repeated sequences can cause more damage to the structure than a single ordinary event, due to the accumulation of inelastic deformations. However, information on repeated acceleration sequences is currently limited. This paper proposes a simple stochastic model for representing repeated acceleration sequences. Subsequently, the model is used in investigating the response of nonlinear single-degree-of-freedom (SDOF) structures to random earthquakes of repeated sequences. The ground acceleration is represented as a stationary Gaussian random process modulated by an envelope function of repeated character. The structural response is quantified in terms of the input and hysteretic energies, ductility demand, damage indices and failure probability. Numerical demonstrations of the response of nonlinear SDOF systems to acceleration sequences are provided.