A novel attached-spring model for damage quantification and degradation evaluation of short/mid-span bridges

Ning Wang, Can Wang, Tian-li Huang, Chuan-rui Guo
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Abstract

Short/mid-span bridges are the most commonly used infrastructure in highways, railways, and other transportation projects. With service time increasing, local damage and performance degradation of short/mid-span bridges are inevitable. Therefore, the assessment of the bridge condition is essential to ensure its safe operation. However, the existing methods mostly assume the damage region of the bridge as a uniform reduction in stiffness, which is not consistent with the actual bridge. Consequently, those methods can hardly achieve the evaluation of the damage. To address this issue, this paper proposes a novel attached-spring model for damage quantification and degradation evaluation of short/mid-span bridges. By assuming the damage region as a spring, an attached-spring model is proposed to describe the nonuniform local damage of the bridge. Then, the deflection influence line is used to identify the stiffness and position of the attached-spring, which achieves the damage detection and evaluation. This approach provides a general model to describe various bridge damage and evaluate the effect of the damage. Numerical simulation and experimental tests are used to verify the feasibility and accuracy of the proposed method. By comparing the results identified from the moving load test and those measured from the static test, the performance of the method is assessed.
用于中短跨度桥梁损伤量化和退化评估的新型附着弹簧模型
中短跨度桥梁是公路、铁路和其他交通项目中最常用的基础设施。随着使用时间的增加,中短跨度桥梁的局部损坏和性能下降不可避免。因此,对桥梁状况的评估对于确保桥梁的安全运行至关重要。然而,现有的方法大多假定桥梁的损坏区域为刚度均匀降低,这与实际桥梁情况不符。因此,这些方法很难实现对损伤的评估。针对这一问题,本文提出了一种用于中短跨度桥梁损伤量化和退化评估的新型附着弹簧模型。通过将损伤区域假定为弹簧,提出了一种附着弹簧模型来描述桥梁的非均匀局部损伤。然后,利用挠度影响线确定附着弹簧的刚度和位置,从而实现损伤检测和评估。这种方法提供了一个通用模型来描述各种桥梁损伤并评估损伤的影响。通过数值模拟和实验测试,验证了所提方法的可行性和准确性。通过比较动载测试和静载测试的结果,评估了该方法的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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