Soil‐structure interaction effects on the fundamental periods of the shear‐wall dominant buildings: Fid-Bau Portal

Soil‐structure interaction effects on the fundamental periods of the shear‐wall dominant buildings

Balkaya, Can / Yuksel, S. Bahadir / Derinoz, Okan

Shear‐wall dominant reinforced concrete buildings constructed with tunnel‐form technique are prevalently constructed in regions with high seismicity due to their ease of construction and inherent resistance to lateral forces. However, the current seismic codes and the design provisions constitute inadequate guidelines for the earthquake‐resistance design of these buildings. In particular, the prediction of their fundamental periods via current empirical expressions yields not only erroneous results, but also ignores soil‐structure interaction (SSI) effects. For the objective of understanding their dynamic characteristics, a series of eigen analyses is conducted with and without considering SSI effects. The soil effects on foundations are represented by linear translational and rotational winkler springs, and rigidities of the springs are computed from the foundation size and the uniform soil compressibility. An ensemble of 140 different shear‐wall dominant buildings with varying heights is simulated in three‐dimensions considering four different soil conditions. It is proven that the vibration periods and the mode shapes of the shear‐wall dominant buildings may change depending on the different soil conditions. Based on the results of the three dimensional finite element analyses, a set of new empirical equations was proposed to predict the fundamental periods of the shear‐wall dominant buildings accounting the SSI effects. Copyright © 2010 John Wiley & Sons, Ltd.