scholarly journals Study the correlation of natural frequency and damage index of 2D steel EBF-vertical shear link

2021 ◽  
Vol 794 (1) ◽  
pp. 012026
Author(s):  
Sarah F Nugroho ◽  
M Orientilize ◽  
B O B Sentosa
Keyword(s):  
Natural Frequency ◽  
Damage Index ◽  
Vertical Shear ◽  
Shear Link

Structural Damage Detection Based on Natural Frequency Vector

2008 ◽  
Author(s):  
Zhichun Yang ◽  
Le Wang
Keyword(s):  
Damage Detection ◽  
Natural Frequency ◽  
Structural Damage ◽  
Natural Frequencies ◽  
Damage Index ◽  
Frequency Vector ◽  
Actual Structure ◽  
Damage States ◽  
Shear Frame ◽  
Feature Database

Based on the new conception of natural frequency vector (NFV) and natural frequency vector assurance criterion (NFVAC), a new damage detection method using the natural frequencies as damage character is described in detail. For a specific structure, a series of small damage states can be simulated and the NFVs of these damaged structures can be calculated and used to build the damage feature database of the structure. Then, the values of natural frequency vector assurance criterion (NFVAC) which are calculated between the damage states in the damage feature database and the actual structure are used as damage index. An 8-story shear frame model is adopted as an example to show the feasibility and validity of the proposed method. Both numerical simulations and model experiments for damage detection are performed, the results demonstrate that using NFVAC, the damage location can be identified correctly and the damage extents can be estimated as well.

Development of Digital Image Correlation Technique to Monitor Structural Damage Based on Natural Frequency as Damage Index

2011 ◽  
Vol 71-78 ◽  
pp. 3899-3903
Author(s):  
Wen Pei Sung ◽  
Ming Hsiang Shih ◽  
Feng Jen Tsai
Keyword(s):  
Digital Image Correlation ◽  
Natural Frequency ◽  
Digital Image ◽  
Structural Damage ◽  
Damage Index ◽  
Correlation Method ◽  
Cost Effective ◽  
Image Correlation ◽  
Correlation Technique ◽  
Sufficient Information

Recently, some serious earthquakes happened in the world and seriously threaten the safety of the life and property of the people. Monitoring and measuring the quakeproof capacity of building need to install high cost sensitive instruments to provide sufficient information. A cost-effective and reliable method based on the applying digital image correlation method, DIC to monitor the natural frequency of building under excitation of earthquake as damage index is proposed in this research. Using DIC to monitor the structural damage based on the natural frequency as damage index can easily detect the structural damage after the excitation of earthquake. Test results reveal that sensitivity of this DIC method is superior to traditional data collected by installed accelerometers, ACC in structure.

Damage Assessment of Prestressed Concrete Girders Using Crack Fractal and Frequency

2019 ◽  
Author(s):  
Shenghua Tang ◽  
Zhi Fang
Keyword(s):  
Natural Frequency ◽  
Prestressed Concrete ◽  
Damage Index ◽  
Box Girders ◽  
Crack Patterns ◽  
Concrete Girders ◽  
Damage Degree ◽  
Damage Grades ◽  
Box Counting Method ◽  
Prestressed Concrete Girders

<p>Two novel approaches are proposed in the present study to assess the damage degree of girders based on the fractal analysis of crack patterns and natural frequency. Two full scale simply‐supported prestressed concrete box girders were firstly designed and subjected to three‐point repeated load bending tests. Concrete cracking, deformation and natural frequency of the girder were investigated during the test. Then, the box‐counting method was improved by rectangle box to analyze the fractal dimension (FD) of girders based on the flexural crack pattern in each loading stage. It shows that the surface crack patterns of the tested girders possessed definite fractal character. The FD of the girders has also an approximately bilinear relationship with the natural frequency of girders. The turning point is very close to the yielding of the prestressed tendons in the girders. Based on this, a damage index is proposed to estimate the remnant stiffness of the girders based on the FD of visible cracks. The FD frequency curves can also be employed to discriminate the damage grades of the girders. Both of the two approaches have been verified with high accuracy.</p>

The Damage Assessment of Steel Structures Using FDD Method

2013 ◽  
Vol 831 ◽  
pp. 145-148
Author(s):  
Kang Min Lee ◽  
Keun Yeong Oh ◽  
Rui Li ◽  
Liu Yi Chen ◽  
Kang Seok Kim
Keyword(s):  
Natural Frequency ◽  
Structural Damage ◽  
Impact Load ◽  
Damage Index ◽  
Steel Structures ◽  
Frame Structure ◽  
Dimensional Structure ◽  
Actual Behavior ◽  
Physical Damage ◽  
Element Analysis

Mathematical model through system identification techniques is composed of the development of a variety of back Analysis solutions and signal processing technology reflecting physical damage of structures. This study was in progress divided into analysis and experimental research, and it was simulated by simplified model based on relevant theory of damage locations and damage estimates. Steel structure concerned by the vibration and impact load was researched in order to predict the dynamic behavior. The 3rd floor of one bay steel frame structure was used, because analysis of whole structure is inconvenient when analyzing and testing, and it is very hard to accurately predict actual behavior by complexity of model in case of three-dimensional structure. Natural frequency of the simulation was calculated as using ANSYS program, general-purpose finite element analysis program, and damage index was estimated through counting natural frequency when structural damage occurred in the test as using the FDD (Frequency-Domain Decomposition).

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