Ahmad Aizaz, Ahmed Awais, Iqbal Mudassir, Ali Syed Muhammad, Khan Ghufranullah, Eldin Syed M, Yosri Ahmed M
Department of Civil Engineering, University of Engineering & Technology, Peshawar, 25120, Pakistan.
Oslo Metropolitan University, 0166, Oslo, Norway.
Sci Rep. 2023 Aug 18;13(1):13461. doi: 10.1038/s41598-023-39577-6.
Bridges are among the most vulnerable structures to earthquake damage. Most bridges are seismically inadequate due to outdated bridge design codes and poor construction methods in developing countries. Although expensive, experimental studies are useful in evaluating bridge piers. As an alternative, numerical tools are used to evaluate bridge piers, and many numerical techniques can be applied in this context. This study employs Abaqus/Explicit, a finite element program, to model bridge piers nonlinearly and validate the proposed computational method using experimental data. In the finite element program, a single bridge pier having a circular geometry that is being subjected to a monotonic lateral load is simulated. In order to depict damages, Concrete Damage Plasticity (CDP), a damage model based on plasticity, is adopted. Concrete crushing and tensile cracking are the primary failure mechanisms as per CDP. The CDP parameters are determined by employing modified Kent and Park model for concrete compressive behavior and an exponential relation for tension stiffening. The performance of the bridge pier is investigated using an existing evaluation criterion. The influence of the stress-strain relation, the compressive strength of concrete, and geometric configuration are taken into consideration during the parametric analysis. It has been observed that the stress-strain relation, concrete strength, and configuration all have a significant impact on the column response.
桥梁是最易遭受地震破坏的结构之一。在发展中国家，由于桥梁设计规范过时和施工方法不当，大多数桥梁在地震方面存在缺陷。尽管成本高昂，但试验研究对于评估桥墩很有用。作为一种替代方法，数值工具被用于评估桥墩，并且许多数值技术可在此背景下应用。本研究采用有限元程序Abaqus/Explicit对桥墩进行非线性建模，并使用试验数据验证所提出的计算方法。在有限元程序中，模拟了一个承受单调横向荷载的圆形截面单桥墩。为了描述损伤，采用了基于塑性的损伤模型——混凝土损伤塑性模型（CDP）。根据CDP，混凝土压碎和拉伸开裂是主要的破坏机制。CDP参数通过采用修正的肯特和帕克混凝土抗压行为模型以及拉伸强化的指数关系来确定。使用现有的评估标准对桥墩的性能进行了研究。在参数分析过程中考虑了应力 - 应变关系、混凝土抗压强度和几何构型的影响。已经观察到，应力 - 应变关系、混凝土强度和构型对柱的响应都有显著影响。
