. 2016 Sep 2;46(4):537–559. doi: 10.1002/eqe.2802
Copyright © 2016 The Authors. Earthquake Engineering & Structural Dynamics Published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Figure 5.
First two natural modes.