Dynamic Property of a New Type of Postearthquake Temporary Prefabricated Lightweight Steel Structure

Table 1

Natural frequencies obtained from two methods.

Vibration mode	Natural frequency in X direction (Hz)		Natural frequency in Y direction (Hz)
	Ambient random vibration method	Forced vibration method	Ambient random vibration method	Forced vibration method
First-order	16.632	16.724	11.046	10.986
Second-order	49.415	48.339	33.845	32.684