Damage localization and severity estimate for three-dimensional frame structures

Li, Huajun; Fang, Hui; Hu, Sau‐Lon James

doi:10.1016/j.jsv.2006.08.042

Cited by 30 publications

(24 citation statements)

References 8 publications

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“…This method defines two axial and transverse damage indicators for each member. Analyzing the joint information of these indicators improves the accuracy of localizing damage elements [10][11][12].…”

Section: Review Of Damage Detection Methodsmentioning

confidence: 99%

Reliability of Dynamically Measured Flexibility Matrix on Damage Detection of Frame Structures

Monajemi

Razak

Ismail

2012

Topics in Modal Analysis II, Volume 6

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The use of dynamically measured flexibility matrix to indicate and locate damage is reported in many studies. However their focus is mostly on structures like beams or slabs that each node has one degree of freedom and all DOFs are in the same direction. For a structure with degrees of freedoms in three directions e.g. frame structures, both modal testing and damage detection become more complicated. It is because each DOF in the stiffness matrix is influenced by all the members connected to it. When it comes to flexibility matrix, another problem arises. Since flexibility matrix is more global, damage does not only affect the related DOFs, but others too. This article aims to address these problems in order to develop a reliable damage detection method for frame structures. The modal parameters of a four story frame structure are calculated for intact and damage cases. Changes in the flexibility matrix were analyzed for different damage scenarios when the damage member is known. It was suggested that there are some patterns that relate DOFs and members which can be used to locate the damage member. Introduction Review of Damage Detection MethodsVibration-based damage detection methods are vastly used to identify and locate probable damages through different types of structures. The basic principle is simple; once damage appears in the structure, it changes the structure's stiffness matrix, which accordingly affects the modal behaviour of the structure. Therefore major changes in modal parameters of the structure may perhaps be understood as existence of damage.The simplest modal parameter that can be used for damage detection purposes is natural frequency. But the sensitivity of frequency shifts to minor damages is relatively low which requires more accurate measurements [1,2]. Salawu [3] stated that the advantages of using natural frequencies are its simplicity in both modal analysis and detection algorithm. Friswell, et al. [4] used frequency shifts of the first n modes for undamaged structure and some proposed damage scenarios. Then they calculated the ratios of all frequency shifts between undamaged and each damaged scenarios. To detect the probable damage in a candidate structure, the same ratios were computed and checked if it lies in any of the damage classes.Other modal parameter that can be used for damage detection purposes is mode shape. Fox [5] used the modal assurance criteria (MAC) to determine the relations between the mode shapes of undamaged and damaged structures. They suggested the MAC based on measurement points close to a node point is a more sensitive indicator of changes in the mode shape caused by damage. One of the most reported detection methods based on mode shapes uses modal strain energy as an indicator to represent damage. Modal strain energy was developed by Stubbs et al. [6] and was successfully applied to onedimensional beam type structures for damage localization. However its application for two and three-dimensional frame type structures was not as promising. Yang and...

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Section: Review Of Damage Detection Methodsmentioning

confidence: 99%

Reliability of Dynamically Measured Flexibility Matrix on Damage Detection of Frame Structures

Monajemi

Razak

Ismail

2012

Topics in Modal Analysis II, Volume 6

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“…It has a total of 8 Figure 1. The size of the test plate is 400 mm x 400 mm and total thickness 3.5mm.…”

Section: Composite Platesmentioning

confidence: 99%

“…However the use of the embedded sensors or the excitation at the frequency higher than 10 kHz may not be always practical and possible. The study on the change in the modal parameters is generally based on the theoretical study and a few experimental examples limited to the modal analysis [7][8]. This approach may not be useful when the damage or delamination size is small.…”

Section: Introductionmentioning

confidence: 99%

Experimental Vibration Study on the Healthy and Delaminated Composite Plates

Ullah¹,

Sinha²

2011

J. Phys.: Conf. Ser.

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Abstract. Vibration based damage, in particular delamination detection, in the composite structures is an active research area. The present study is also on the dynamics of the composite plates with and without delamination based on the experimental study. The test plate made of E-glass fibre and epoxy resins has been used here. A piezo-electric shaker has been used to excite the composite plate and the acceleration responses were measured using the number of accelerometers. The dynamics of the delaminated composite plates were then compared with a healthy composite plate when the vibration experiments have been conducted at the lower modes. The paper will discuss the observations made on the measured vibration responses from both the healthy and the delaminated plates and the possibility of the delamination detection from the experimental vibration data.

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“…Based on this consideration, two typical hypotheses and their derivative approaches have been proposed so far. The first approach proposed by Li et al 16 is based on the hypothesis that only a few selected local members are damaged. That is to say, one must first prejudge the number of true-damaged members.…”

Section: Introductionmentioning

confidence: 99%

Cross modal strain energy–based structural damage detection in the presence of noise effects

Wang

2017

Advances in Mechanical Engineering

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When conducting damage assessment by cross modal strain energy method, two very different approaches can be employed to solve cross modal strain energy equations. However, there are no performance comparison between these two approaches on their efficiency and effectiveness, especially under noise-polluted situations. In this article, cross modal strain energy method together with these two solving approaches, locality and wholeness approaches, is summarized, and their intrinsic features are extensively discussed. A new methodology for damage assessment is developed by combining these two approaches, in which the wholeness approach is first utilized for roughly localizing the potentially damaged members, and the final damage locations and associated extents are exactly estimated with the locality approach in the second step. To effectively investigate and compare the behavior of cross modal strain energy method, two factors, one measuring the recognition ability of damage location and the other measuring the precision of severity estimation, are introduced. A numerical simulation is conducted for a three-dimensional offshore platform structure. Both single-and multiple-damage cases, with and without noise effects, are considered. The numerical results indicate that the new methodology outperforms either approach in damage localization and severity estimation.

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Damage localization and severity estimate for three-dimensional frame structures

Cited by 30 publications

References 8 publications

Reliability of Dynamically Measured Flexibility Matrix on Damage Detection of Frame Structures

Reliability of Dynamically Measured Flexibility Matrix on Damage Detection of Frame Structures

Experimental Vibration Study on the Healthy and Delaminated Composite Plates

Cross modal strain energy–based structural damage detection in the presence of noise effects

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