竖向地震分量对连续 RC 桥梁响应的影响

IF 4.4 2区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers & Structures Pub Date : 2024-10-04 DOI:10.1016/j.compstruc.2024.107558
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引用次数: 0

摘要

本文通过使用增强型非线性数值模型进行数值模拟,研究了垂直地震加速度对 RC 桥梁地震响应的影响。结果证实,通过实际记录或按比例水平记录加入垂直加速度,可显著改变地震响应和倒塌机制。在实际垂直记录的情况下,垂直分量对结构过早恶化、需求增加和加速破坏机制有显著作用。另一方面,该研究强调了按照某些地震规范的建议,使用按比例缩放的水平记录来表示垂直加速度的不足之处,因为这不仅会扭曲地震反应评估,还会改变破坏模式。对垂直振动的分析显示了更高的位移,增加了对甲板的抗弯要求,并导致中央支柱逐渐失去垂直支撑。这项研究证明了在桥梁设计评估中准确考虑垂直地震加速度的必要性,因为它们对结构响应和破坏机制的影响不容低估。这项研究强调了高度详细的三维数值模型在评估传统参数以及捕捉材料和几何非线性引起的复杂倒塌机制方面的重要性。
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Influence of the vertical seismic component on the response of continuous RC bridges
This paper investigates the influence of vertical seismic accelerations on the seismic response of RC bridges through numerical simulations using an enhanced non-linear numerical model. Results confirm that the incorporation of vertical accelerations, either through actual records or scaled horizontal records, can considerably modify the seismic response and the collapse mechanism. In the case of actual vertical records, the vertical component significantly contributes to premature structural deterioration, intensifying demand and accelerating failure mechanisms. On the other hand, the study underscores the inadequacy of using scaled horizontal records to represent vertical accelerations, as suggested by some seismic codes, as it not only distorts seismic response evaluation but also alters failure modes. The analysis of vertical vibration reveals higher displacements, increasing flexural demand on the deck, and leading to a progressive loss of vertical support at the central column. The research establishes the need to accurately account for vertical seismic accelerations in bridge design evaluations, as their impact on structural response and failure mechanisms cannot be underestimated. The work highlights the importance of a highly detailed 3D numerical model in assessing traditional parameters and capturing complex collapse mechanisms arising from material and geometric nonlinearities.
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来源期刊
Computers & Structures
Computers & Structures 工程技术-工程:土木
CiteScore
8.80
自引率
6.40%
发文量
122
审稿时长
33 days
期刊介绍: Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.
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