Abstract—The paper presents the analysis of dynamic response of RC bridge to mining shock. Calculations of the dynamic response of the bridge were performed using three different methods. Initially, classical time history analysis were carried out with a model of uniform kinematic excitation (THA_U). In that method it is assumed that the velocity of wave propagation in the ground is infinite, so the excitation at all supports is identical. Then, a model of non-uniform kinematic excitation was introduced (THA_N). In that model wave passage along the bridge was taken into consideration. Finally, the response spectrum method (RSA) was used, which is most often incorporated because of the simplicity of calculation. Internal forces obtained with three methods were compared to assess the effect of non-uniformity of kinematic excitation on dynamic response of the bridge. It occurred that bending moments and shear forces obtained with the model of non-uniform excitation can exceed those obtained for with the model of uniform excitation. The comparative analysis also indicates that the response spectrum method may lead to non-conservative assessment of the dynamic response of the bridge.
Index Terms—Mining shocks. non-uniform kinematic excitation, reinforced concrete bridges, response spectrum analysis.
The authors are with the Civil Engineering Faculty, Cracow University of Technology, Cracow, Poland (e-mail: jdulinsk@pk.edu.pl, fabijanska.maria@gmail.com).
Cite: Joanna M. Dulińska and Maria Fabijańska-Kopacz, "Evaluation Methods of Dynamic Response of RC Bridge to Spatially Varying Mining Shock," International Journal of Engineering and Technology vol. 4, no. 5, pp. 638-641, 2012.
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