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Vibration based damage identification of a scale-model steel frame structure subjected to bolt connection failures

Ay, AM, Wang, Y, Khoo, SY and Li, A-J (2013) Vibration based damage identification of a scale-model steel frame structure subjected to bolt connection failures In: SHMII-6 2013: Structural Health Monitoring of Intelligent Infrastructure 2013 international conference, 2013-12-09 - 2013-12-11, Hong Kong, China.

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Large-span steel frame structures prove to be an ideal choice for their speed of construction, relatively low cost, strength, durability and structural design flexibility. For this type of structure, the beam-column connections are critical for its structural integrity and overall stability. This is because a steel frame generally fails first at its connectors, due to the change in stress redistribution with adjacent members and material related failures, caused by various factors such as fire, seismic activity or material deterioration. Since particular attention is required at a steel frame’s connection points, this study explores the applicability of a comprehensive structural health monitoring (SHM) method to identify early damage and prolong the lifespan of connection points of steel frames. An impact hammer test was performed on a scale-model steel frame structure, recording its dynamic response to the hammer strike via an accelerometer. The testing procedure included an intact scenario and two damage scenarios by unfastening four bolt connections in an accumulating order. Based entirely on time-domain experimental data for its calibration, an Auto Regressive Average Exogenous (ARMAX) model is used to create a simple and accurate model for vibration simulation. The calibrated ARMAX model is then used to identify various bolt-connection related damage scenarios via R2 value. The findings in this study suggest that the proposed time-domain approach is capable of identifying structural damage in a parsimonious manner and can be used as a quick or initial solution.

Item Type: Conference or Workshop Item (Conference Paper)
Subjects : Civil Engineering
Divisions : Surrey research (other units)
Authors :
Ay, AM
Khoo, SY
Li, A-J
Date : 2013
Copyright Disclaimer : ©2013, Hong Kong Polytechnic University
Contributors :
Xu, YL
Zhu, S
Xia, Y
Ni, YQ
Law, SS
Yin, JH
Su, ZQ
publisherHong Kong Polytechnic University,
Uncontrolled Keywords : ARMAX, Bolt connection, Impact testing, Structural health monitoring, Time domain steel frame
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:55
Last Modified : 23 Jan 2020 18:59

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