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Evaluating damage extent of fractured beams in steel moment-resisting frames using dynamic strain responses

机译：利用动态应变响应评估抗弯框架中梁的破坏程度

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摘要

Delays in the postearthquake safety estimations of important buildings significantly increase unnecessary disorder in economic and social recovery following devastating earthquakes. Providing promptness and objectivity in evaluation procedures, damage detection through a structural health monitoring system using sensors attracts attention from building owners and other stakeholders. Nonetheless, local damage on individual structural elements is not easily identifiable, as such damage weakly relates to the global vibrational characteristics of buildings. The primary objectives of this research are to present and verify a method that quantifies the amount of local damage (i.e., fractures near beam-column connections) for the health monitoring of steel moment-resisting frames that have undergone a strong earthquake ground motion. In this paper, a novel damage index based on the monitoring of dynamic strain responses of steel beams under ambient vibration before and after earthquakes is firstly presented. Then, the relation between the amount of local damage and the presented damage index is derived numerically with a parametric study using a nine-story steel moment-resisting frame model. Finally, the effectiveness of the damage index and an associated wireless strain-sensing system are examined with a series of vibration tests using a five-story steel frame test bed.
机译：重要建筑物地震后安全估计的延迟显着增加了毁灭性地震后经济和社会复苏中不必要的混乱。通过评估程序提供及时性和客观性，通过使用传感器的结构健康监测系统进行的损坏检测可引起建筑所有者和其他利益相关者的关注。但是，很难识别出单个结构元件的局部损坏，因为这种损坏与建筑物的整体振动特性关系不大。这项研究的主要目的是提出并验证一种量化局部损伤量（即梁柱连接处附近的断裂）的方法，以对遭受强烈地震地震动的钢制抗弯框架进行健康监测。本文首先基于地震前后钢梁在环境振动下的动态应变响应监测提出了一种新的损伤指标。然后，通过使用九层钢抗弯框架模型的参数研究，通过数值推导得出了局部损伤量与所提出的损伤指数之间的关系。最后，使用五层钢框架测试台进行一系列振动测试，以检验损伤指数和相关无线应变传感系统的有效性。

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