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Prediction of Global and Localized Damage and Future Reliability for RC Structures subject to Earthquakes

机译：受地震影响的RC结构的全局和局部损伤及其可靠性预测

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The paper deals with the prediction of global and localized damage and the future reliability estimation of partly damaged reinforced concrete (RC) structures under seismic excitation. Initially, a global maximum softening damage indicator is considered based on the variation of the eigenfrequency of the first mode due to the stiffness and strength deterioration of the structure. The hysteresis of the first mode is modelled by a Clough and Johnston hysteretic oscillator with a degrading elastic fraction of the restoring force. The linear parameters of the model are assumed to be known, measured before the arrival of the first earthquake from non-destructive vibration tests or via structural analysis. The previous excitation and displacement response time series is employed for the identification of the instantaneous softening using an ARMA model. The hysteresis parameters are updated after each earthquake. The proposed model is next generalized for the MDOF system. Using the adapted models for the structure and the global damage state, the global damage in a future earthquake can then be estimated when a suitable earthquake model is applied. The performance of the model is illustrated on RC frames which were tested by Sözen and his associates.
机译：本文探讨了地震作用下局部损坏的钢筋混凝土结构的整体和局部损伤的预测以及未来的可靠性估计。最初，基于由于结构的刚度和强度劣化而导致的第一模式的本征频率的变化来考虑全局最大软化破坏指标。第一种模式的磁滞由Clough和Johnston磁滞振荡器建模，其恢复力的弹性分数下降。假定模型的线性参数是已知的，这些参数是在第一次地震之前通过无损振动测试或通过结构分析测得的。先前的激励和位移响应时间序列用于使用ARMA模型识别瞬时软化。每次地震后都会更新磁滞参数。接下来针对MDOF系统推广提出的模型。使用适用于结构和整体破坏状态的适应模型，当应用合适的地震模型时，可以估算未来地震的整体破坏。该模型的性能在由Sözen及其同事测试的RC框架上进行了说明。

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