Structures ( IF 4.1 ) Pub Date : 2020-09-26 , DOI: 10.1016/j.istruc.2020.08.081 Wei Yuan , Zhongkui Cai , Anxin Guo
Due to the different corrosive conditions in the atmospheric zone, splash and tidal zone, and submerged zone, coastal bridge columns in marine environment always suffer from non-uniform corrosion along the height. As a result, an important phenomenon of plastic hinge transfer can occur, which has a significant effect on the seismic performance of the coastal structures. However, this problem has seldom been studied. The plastic hinge transfer phenomenon has been observed in previous cyclic loading and shaking table tests of the authors [1], [2]. In this study, a further study focusing on the changing time of different failure modes and the plastic hinge length is conducted. First, the possible failure modes resulted from the non-uniform corrosion are discussed, in terms of the distribution of plasticity at the ultimate state. Then, a finite element modeling method of the bridge columns with different service time is developed. Equations that can predict the failure mode are proposed based on multi-parameter regression analysis. Finally, a flowchart describing the rapid determination method of the time-dependent failure mode and the way to obtain the equivalent plastic hinge length is proposed. The results indicate that the prediction method is with high accuracy and efficiency, which is helpful for the seismic performance design and evaluation of the coastal bridges during the entire service life.
中文翻译:
沿海桥梁全生命周期地震破坏模式的快速确定方法
由于大气区,飞溅区和潮汐区以及淹没区的腐蚀条件不同,海洋环境中的沿海桥梁柱沿高度始终遭受非均匀腐蚀。结果,可能发生塑料铰链转移的重要现象,这对沿海结构的抗震性能具有重大影响。但是,很少研究此问题。作者在先前的循环载荷和振动台试验中已经观察到塑性铰转移现象[1],[2]。在这项研究中,针对不同失效模式的变化时间和塑料铰链长度进行了进一步的研究。首先,根据极限状态下的塑性分布,讨论了由于腐蚀不均匀而可能导致的破坏模式。然后,提出了一种不同使用时间的桥梁柱的有限元建模方法。在多参数回归分析的基础上,提出了可以预测失效模式的方程。最后,提出了描述与时间有关的失效模式的快速确定方法以及获得等效塑料铰链长度的方法的流程图。结果表明,该预测方法具有较高的准确度和效率,对于沿海桥梁在整个使用寿命期间的抗震性能设计和评估有帮助。提出了描述随时间变化的失效模式的快速确定方法以及获得等效塑料铰链长度的方法的流程图。结果表明,该预测方法具有较高的准确度和效率,对于沿海桥梁在整个使用寿命期间的抗震性能设计和评估有帮助。提出了描述随时间变化的失效模式的快速确定方法以及获得等效塑料铰链长度的方法的流程图。结果表明,该预测方法具有较高的准确度和效率,对于沿海桥梁在整个使用寿命期间的抗震性能设计和评估有帮助。