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首页> 外文期刊>International journal of steel structures >Detection of Fracture in Steel Members of Building Structures by Microstrain Measurement
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Detection of Fracture in Steel Members of Building Structures by Microstrain Measurement

机译：通过微陶器测量检测建筑结构钢构件骨折

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This paper discusses a possibility of detecting structural damage caused by an earthquake, by measuring the time history of the strain of beams and columns before and/or after the earthquake. An index called "local stiffness" is defined as the ratio of section force amplitude to representative displacement amplitude, and this ratio can be physically interpreted as stiffness. By calculating section force amplitude at a section or node from the measured strain amplitude under a microtremor or small aftershocks and comparing it with the results of a static pushover analysis, it becomes possible to detect any structural damage, such as fractures. This methodology was applied and the microstrain data of a steel moment frame were measured in a large-scale shaking table test; beam-end fractures were observed after some excitation tests. After the beam-end fracture formed, the measured local stiffness dropped significantly below the analysis value, indicating the possibility of employing this value to detect fractures using the analysis value as a threshold value.
机译：本文讨论了通过测量地震前和/或之后的横梁和柱子的时间历史来检测由地震引起的结构损坏的可能性。称为“局部刚度”的指数被定义为截面力幅度与代表性位移幅度的比率，并且该比率可以物理地被解释为刚度。通过在微小余震下的测量应变幅度下计算部分或节点处的截面力幅度并将其与静态推送分析的结果进行比较，可以检测任何结构损坏，例如裂缝。应用该方法，并在大规模摇动台试验中测量钢力矩框架的微纹数据;在一些励磁试验后观察到光束端部骨折。在形成的光束端骨折之后，测量的局部刚度明显低于分析值，表明使用该值使用分析值作为阈值检测裂缝的可能性。

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