Risk Assessment of Aged Concrete Gravity Dam Subjected to Material Deterioration Under Seismic Excitation

International Journal of Concrete Structures and Materials

Table 5 Comparison of fundamental frequencies.

Fundamental frequencies	References		This study FEM	CoV
Fundamental frequencies	(1) FDD (Ko et al. 2009)	(2) Eq. (4) (Fenves and Chopra 1986)	This study FEM	With (1)	With (2)
1^st	5.27	5.052	5.3467	0.01	0.04
2^nd	12.01	–	12.557	0.03	–