Nonlinear Resonance Analysis of Slender Portal Frames under Base Excitation

Table 3

Natural vibration frequency of pitched-roof frame.

(m)	Natural frequency of vibration (rad/s)
	1st mode	2nd mode	3rd mode	4th mode
0.0	16.60	21.09	60.68	117.35
3.0	15.52	25.58	58.03	91.95
6.0	12.93	24.82	50.24	59.47