Abstract
In response spectrum method, the modal seismic response is a combination of the damped periodic part and a rigid part. In high-frequency modes, the damped periodic part of the response is negligible and the response becomes rigid. The proposed methods and the current practices that have been used to account the effect of rigid part of the response into the seismic analysis of structures and their modal response combination methods are reviewed. Case studies on (i) a squat shear wall with an aspect ratio less than unity to show the behavior of a structure in high-frequency region of a spectrum and (ii) a building with a stiff base supporting a tower to show the effect of “missing mass” on the seismic analysis of structures with rigid modes are presented. The paper concludes with a set of methods for considering the effect of rigidity in earthquake analysis of irregular structures based on the latest developments in the field.
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Dhileep, M., Arumairaj, P.D., Hemalatha, G., Sandeep, M.S. (2021). Effect of Rigidity on Seismic Analysis of Structures. In: Singh, R.M., Sudheer, K.P., Kurian, B. (eds) Advances in Civil Engineering. Lecture Notes in Civil Engineering, vol 83. Springer, Singapore. https://doi.org/10.1007/978-981-15-5644-9_62
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