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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Structural health monitoring of a 32-storey steel-frame building using 50 years of seismic monitoring data
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Structural health monitoring of a 32-storey steel-frame building using 50 years of seismic monitoring data

机译：使用50年的地震监测数据的32层钢框架建筑的结构健康监测

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摘要

The case study, Los Angeles 32-storey residential building, has an exceptionally long seismic observation history, spanning 50 years (1971-2020), during which it has experienced many earthquakes, some causing extensive damage in the metropolitan area. Records of 13 earthquakes are analyzed, including San Fernando of 1971, to find out if permanent loss of stiffness occurred in the structure since 1971 and to describe statistically its nonlinear elastic behavior, not related to damage. It is a rare example of an instrumented pre-San Fernando earthquake steel-frame building, constructed with some on-site welded column-beam connections, type of construction that exhibited weaknesses after the Northridge, 1994 earthquake. The identification method consists of fitting equivalent uniform and four-layer Timoshenko beams models by waveform inversion of bandpass filtered impulse responses, which results in piecewise constant profiles of shear wave velocity (the damage sensitive parameter) and the elastic moduli ratio, reflecting the distribution of structural stiffness along the height. The nonlinear elastic behavior derived from the smaller amplitude data constitutes strain-dependent baseline for future structural health monitoring of this building. This behavior reveals more prominent strain dependency in the longitudinal direction and stronger variation with strain toward the base of the structure.
机译：案例研究，洛杉矶32层级的住宅建筑具有特殊的震荡观察历史，跨越50年（1971-2020），在此期间经历了许多地震，一些导致大都市区造成广泛损害。分析了13个地震的记录，包括1971年的San Fernando，以了解自1971年以来的结构中发生的永久性刚度，并描述其无线性弹性行为，与损坏无关。它是一个罕见的仪表预先围地震钢架建筑，采用了一些现场焊接的柱梁连接，建筑类型，在1994年地震之后展出了弱点。识别方法包括通过带通滤波的脉冲响应的波形反转拟合等效均匀和四层Timoshko光束模型，这导致剪切波速度（损伤敏感参数）和弹性模比的分段恒定轮廓，反映了分布沿着高度的结构刚度。来自较小幅度数据的非线性弹性行为构成了对该建筑物的未来结构健康监测的应变依赖性基线。该行为揭示了在纵向方向上的更显着突出的应变依赖性，并且具有朝向结构基部的应变的更强的变化。

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