Cakmak, A. S.

Nielsen, Søren R.K.

Skjærbæk, P. S.

English

A method for localization of structural damage is seismically excited RC-structures using measured acceleration response time series is presented. from measured response from some or all storeys, the two lowest smoothed eigenfrequencies and mode shape coordinates are estimated. these estimates are used as input to a developed substructure iteration method where local storey damages are estimated in such a way that these smoothed values are reproduced. The local damage indicator of a substructure is defined as the average reduction of the stiffness matrix of the initial undamaged substructure. the method is applied to simulated data of a 6-storey, 2-bay test frame (scale 1:5) that is to be tested at the Structural Laboratory of Aalborg University, Denmark. The simulations are performed using the non-linear finite element program of SARCOF. Special emphasis is put on the investigation of the optimal location of measurements sensors, i.e. at which locations along the structure the most information about the damage distribution is gained. In all cases it is assumed that measurements are performed at top storey and ground surface, and the investigations are concentrated on putting one or two more measurement points in between. The two cases where the structure is excited in the first and second mode are investigated and it is found that in general the sensors should be placed in the lower part of the structure. Furthermore, it is found that the method provides good results even when only measurements are at the top storey and ground surface are used

    Aalborg UniversitetIdentification of Damage in IR-Structures from Earthquake Records - Optimal Locationof SensorsNielsen, Søren R.K.; Skjærbæk, P. S.; Cakmak, A. S.Publication date:1996Document VersionEarly version, also known as pre-printLink to publication from Aalborg UniversityCitation for published version (APA):Nielsen, S. R. K., Skjærbæk, P. S., & Cakmak, A. S. (1996). Identification of Damage in IR-Structures fromEarthquake Records - Optimal Location of Sensors. Dept. of Building Technology and Structural Engineering,Aalborg University. Fracture and Dynamics Vol. R9614 No. 77General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 29, 2020

Identification of Damage in IR-Structures from Earthquake Records - Optimal Location of Sensors

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Identification of Damage in IR-Structures from Earthquake Records - Optimal Location of Sensors

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