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Steel and Composite Structures Volume 19, Number 2, August 2015 , pages 385-403 DOI: https://doi.org/10.12989/scs.2015.19.2.385 |
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Modal parametric changes in a steel bridge with retrofitting |
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Suresh Kumar Walia, Hemant Kumar Vinayak, Ashok Kumar and Raman Parti
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| Abstract | ||
| This paper presents the status improvement of an old damaged deck type rural road steel truss bridge through the modal parametric study after partial retrofitting. The dynamic and static tests on bridge were carried out as in damaged state and after partial retrofitting. The dynamic testing on the steel bridge was carried out using accelerometers under similar environmental conditions with same speed of the moving vehicle. The comparison of the modal parameters i.e., frequency, mode shape mode shape curvature, modal strain energy, along with the deflection parameter are studied with respect to structural analytical model parameters. The status up gradation for the upper and downstream truss obtained was different due to differential level of damage in the bridge. Also after retrofitting the structural elemental behavior obtained was not same as desired. The damage level obtained through static tests carried out using total station indicated further retrofitting requirement. | ||
| Key Words | ||
| steel truss bridge; retrofitting; frequency; mode shape; modal strain energy | ||
| Address | ||
| (1) Suresh Kumar Walia, Hemant Kumar Vinayak: Department of Civil Engineering, NIT Hamirpur, Anu, Hamirpur, Himachal Pradesh 177005, India; (2) Ashok Kumar, Raman Parti: Department of Earthquake Engineering, IIT Roorkee, Roorkee-Haridwar Highway, Roorkee, Uttarakhand 247667, India. | ||