Residual stiffness assessment of structurally failed reinforced concrete structure by dynamic testing and finite element model updating |
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Authors: | Pin-Qi Xia James M W Brownjohn |
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Institution: | (1) Department of Structural Engineering and Mechanics, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, P.R. China;(2) School of Civil and Structural Engineering, Nayang Technological University 50, Nanyang Avenue, 639798, Singapore |
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Abstract: | When an under-reinforced concrete beam structure has been loaded to the point where reinforcing steel on the tension side
has yielded, it is deemed to have structurally failed and the full load capacity and stiffness can no longer be developed.
When unloaded from the point of failure, the residual stiffness of the structure is difficult to estimate. There is a need
to establish the serviceability of the structure and ultimately establish the levels of further loading that can be sustained
before total collapse. In this paper we present a method for assessing residual stiffness of such a “failed” reinforced concrete
structure, through the application of dynamic testing and finite element (FE) model updating. In an experimental study, failed
zones in a beam structure were simulated in a FE model. Through a procedure of sensitivity-based updating using the measured
modal properties, the stiffness distribution along the failed beam structure was identified. |
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Keywords: | Stiffness reinforced concrete beam failure damage finite element model updating modal analysis |
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