International Journal of Civil and Structural Engineering

Volume 4 Issue 3 2014          Pages: 389- 401           << Previous      Next>>

Modal criticality index of an existing reinforced cement concrete T-beam bridge

Author Information:

Roseenid Teresa Amaladosson1, Umarani Gunasekaran2, Premavathi Narayanan3
1-Ph.D. Research Scholar, Anna University, Chennai and Associate Professor, St. Joseph’s College of Engineering, Chennai.
2-Associate Professor, Anna University, Chennai.
3-Assistant Professor, Bannari Amman Institute of Technology, Sathyamangalam.

ABSTRACT
An existing reinforced cement concrete T-beam bridge is evaluated using inelastic analysis procedures namely capacity spectrum method (CSM) and modal pushover procedure (MPA). In this paper, MPA is performed in both the transverse and the longitudinal directions of the bridge structure independently. The capacity curves that represent the response of the bridge in transverse direction for the particular modes of the vibration are generated using MPA. Modal Criticality Index (MCI), a value which is the ratio of the Spectral acceleration (Sa) for demand and the Spectral acceleration (Sa) for capacity is determined. Modal criticality index value was calculated, considering the initial stiffness and the secant stiffness of the bridge structure, for identifying the critical mode. From the calculated modal criticality index value, the critical mode of the structure was inferred to be the higher mode irrespective of the stiffness (initial/secant) adopted.

Keyword: Modal Pushover procedure, Capacity Spectrum method, T-Beam bridge, Higher mode effects, Modal Criticality Index, Acceleration-Displacement response spectrum

doi: 10.6088/ijcser.201304010038

Copyright: © 2014 by the author(s), licensee Integrated Publishing Association. This is an open-access article distributed under the terms of the Creative Commons Attribution License (3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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