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Seismic assessment of deep water bridges in reservoir considering hydrodynamic effects using endurance time analysis

机译：考虑水动力作用的水库深水桥梁抗震评估

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摘要

Hydrodynamic effects have a significant impact on the seismic performance of deep water bridges in reservoir. Currently, three-dimensional numerical fluid-structure interaction models are widely used for seismic analysis of such bridges with huge computational time. In this paper, endurance time analysis (ETA) was used as an alternative approach to reduce the simulation effect. The effectiveness and accuracy of this approach were studied by comparing with incremental dynamic analysis (IDA). Firstly, an iterative method based on spectral modification techniques of ground motions was proposed in order to reduce the computational time in developing the endurance time acceleration functions (ETAFs). Then, the generated ETAFs compatible with Chinese seismic code were validated with IDA curves using a coupled water-pier numerical system based on potential-based fluid elements. Finally, a typical deep water bridge in a reservoir was selected as a case study and was modeled by a three-dimensional solid element model to investigate the seismic responses of bridges at different water depths. The accuracy of added-mass method with fiber-based beam-column element models was also evaluated. It can be concluded that the proposed method for generating the ETAFs is an efficient alternative method and the endurance time method can provide sufficiently accurate estimation of hydrodynamic effects.
机译：水动力效应对水库深水桥梁的抗震性能具有重大影响。目前，三维数值流固耦合模型被广泛地用于这种桥梁的地震分析，并且计算时间长。在本文中，耐久性时间分析（ETA）被用作降低模拟效果的替代方法。通过与增量动态分析（IDA）进行比较，研究了该方法的有效性和准确性。首先，提出了一种基于地震动频谱修改技术的迭代方法，以减少开发耐力时间加速函数（ETAF）的计算时间。然后，使用基于势能流体单元的耦合水-码头数值系统，利用IDA曲线验证了与中国地震规范兼容的ETAF。最后，以水库中的典型深水桥梁为例进行了研究，并通过三维立体单元模型对其进行了建模，以研究桥梁在不同水深下的地震响应。还评估了基于纤维的梁柱单元模型的附加质量方法的准确性。可以得出结论，所提出的用于生成ETAF的方法是一种有效的替代方法，而耐力时间方法可以提供足够准确的流体动力效应估计。

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