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A simple and robust non-contact method for rapid structural health monitoring of critical infrastructure using Digital Image Correlation

Primary Information

Domain

Information & Communication Technology

Project No.

7338

Sanction and Project Initiation

Sanction No: F.No.3-18/2015-TS-TS.1

Sanction Date: 29/11/2016

Project Initiation date: 15/02/2017

Project Duration: 36

Partner Ministry/Agency/Industry

Ministry of Road Transport and Highways (MoRTH)

Role of partner:Provide access to Indian Bridge Management System (IBMS) . Provide specific advise regarding types of bridges of interest and allow access to monitor a few bridges. Provide feed back in terms of specific end user requirements.

Support from partner:0.5

Principal Investigator

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Dr. T.P.Tezeswi
National Institute of Technology Warangal

Host Institute

Co-PIs

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Dr. P.Ratish Kumar
National Institute of Technology Warangal

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Dr.K.Gopi Krishna
National Institute of Technology Warangal

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Dr.MVN Sivakumar
National Institute of Technology Warangal

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Dr.M.Shashi
National Institute of Technology Warangal

Scope and Objectives

A simple, cost effective and practical imaging based technique is proposed for monitoring damage in bridges, dams, buildings, nuclear industry, defense and aerospace structures. The objective is to develop an integrated portable digital image correlation (DIC) system that is simple and robust enough to be used in the field.

Deliverables

A simple ruggedized portable integrated digital image correlation (DIC) system using DSLR camera will be developed for providing repeatable accurate measurements to enable categorical GO-NOGO indications of structural condition. The product will enable detection of a global field of deformation with better angular resolution than a total station (camera pixel resolution of approx. 2 arc seconds vs 5-10 arc seconds accuracy of total station) from a distance of upto 300 meters in very large scale structural systems. The deformation measurement resolution and accuracy are expected to increase linearly as the distance between the device and structure reduces. The processed images obtained from DIC and photogrammetry will be integrated into a GIS database and the structures will be categorized according to the current state of health. This will enable a dash-board type of overview of the state of health of geographically distributed large scale infrastructure systems.

Scientific Output

1) Feasibility of QR code based speckle pattern for use in DIC has been demonstrated. This will enable integration of DIC based SHM data with IBMS Database for future use by Ministry of Roads & Transportation. Further, using QR code based speckle patterns on structural components during construction, as well as during operation, will improve the integration of Structural Health Monitoring (SHM) with Building Information Modeling (BIM). 2) Digital Image Correlation based damage recognition and ANN based automatic condition assessment is under development. Publication: QR Code as Speckle Pattern in Digital Image Correlation: Potential Integration of SHM with BIM (under preparation for submission to Journal of Structural Health Monitoring) Patent : Application process initiated for patent claiming innovative usage of QR code based speckle pattern in DIC.

Results and outcome till date

Corresponding to Objective 1 i. Determination of optimal type & location of speckle patterns for obtaining local damage as well as global deformations of structures.(100% Completed) Corresponding to Objective 2 i. Experimental flexural testing of un-deteriorated Scaled RCC T-Beams and correlation with corresponding validated FEA models to further enable prediction of capacity of full scale un-deteriorated RCC T-beams. (40% Completed) ii. Numerical quantification of the Deterioration of T-Beam capacity using established deterioration models. (20% Completed) iii. Development of Damage Index for deteriorated RCC T-Beams based on correlation of experimental data with simulation results.(0% Completed) iv. Determination of weighted damage indices at structural level. (0% Completed)

Societal benefit and impact anticipated

Currently Indian Railways has more than 1. 3 Lakh bridges, out of which 720 are important, 10,828 are major and 1,21,612 are minor bridges. In 2010-11, 1,197 bridges including 16 distressed bridges were rehabilitated/rebuilt. There are 5174 large dams (maximum height of more than 15 m ) in India with more than half of these aged atleast 30 years. The cost of monitoring each and every one of these structures is astronomical. Currently, the most common methods of structural health monitoring in India- visual inspection and sounding, are highly subjective and dependent on the skill level of the maintenance personnel. Methods utilizing the material properties of a structure, such as ultrasonic wave attenuation and electrical conductivity often have practical problems with cabling and difficulty in establishing reliable communication for data transmission and control, in real-life conditions. Moreover, the sheer number of critical facilities necessitates selective monitoring using sensors to reduce cost to the exchequer. In this proposal, a low cost integrated DIC and photogrammetry device as well as data collection framework will be developed for regular structural condition monitoring, that integrates geocoded photographic information with a GIS based system for infrastructure decision-making and management.

Next steps

i. Experimental flexural testing of un-deteriorated Scaled RCC T-Beams and correlation with corresponding validated FEA models to further enable prediction of capacity of full scale un-deteriorated RCC T-beams. (40% Completed) ii. Numerical quantification of the Deterioration of T-Beam capacity using established deterioration models. (20% Completed) iii. Development of Damage Index for deteriorated RCC T-Beams based on correlation of experimental data with simulation results.(0% Completed) iv. Determination of weighted damage indices at structural level. (0% Completed)

Publications and reports

Publication: QR Code as Speckle Pattern in Digital Image Correlation: Potential Integration of SHM with BIM (under preparation for submission)

Patents

Patent : Application process initiated for patent claiming innovative usage of QR code based speckle pattern in DIC.

Scholars and Project Staff

1) Mr. B. Murali Krishna, Institute sponsored PhD student
2) Mr. V. Guruprathap Reddy, JRF

Challenges faced

1) Procurement process is slow and tedious
2) No response from Ministry despite repeated emails and phone calls.

Financial Information

  • Total sanction: Rs. 3850000

  • Amount received: Rs. 2463000

  • Amount utilised for Equipment: Rs. 100000

  • Amount utilised for Manpower: Rs. 1123000

  • Amount utilised for Consumables: Rs. 0

  • Amount utilised for Contingency: Rs. 0

  • Amount utilised for Travel: Rs. 25000

  • Amount utilised for Other Expenses: 0

  • Amount utilised for Overheads: Rs. 0

Equipment and facilities

Laptop for post processing