On the Seismic Response of Protected and Unprotected Middle-Rise Steel Frames in Far-Field and Near-Field Areas

Table 1

Natural periods of the ten models.

Frames	Case  1	Case  2	Case  3	Case  4	Case  5	Case  6	Case  7	Case  8	Case  9	Case  10
𝑇 (s)	0.302	0.2217	0.2835	0.3653	0.1988	0.1498	0.2421	0.1679	0.174	0.2822