Analytical Assessment of the Effect of Vertical Ground Motion on RC Frames Designed for Gravity Loads with Various Geometric Configurations

Table 2

Selected ground motions.

Earthquake	Mw	Station	Fault dist. (km)	PGA (g)		V/H	Time lag (sec)	Scale factor to HGM	Ref. name
				H	V
Imperial Valley (1979)	6.5	Chihuahua	7.3	0.270	0.218	0.807	4.950	1.22	IV-CHI
N. Palm Springs (1986)	6.0	Morongo Valley Fire	12.0	0.205	0.395	1.929	1.155	1.02	PS-MVH
Northridge (1994)	6.7	Arleta Fire	8.7	0.308	0.552	1.790	2.780	0.97	NO-ARL
		Canoga Park	14.7	0.356	0.489	1.374	0.030	1.09	NO-CNP
		N Faring Rd	20.8	0.242	0.191	0.186	2.500	0.96	NO-FAR
		Roscoe Blvd	10.1	0.303	0.306	1.010	−1.590	0.97	NO-ROB
Chi-Chi, Taiwan (1999)	7.6	TCU055-NS	6.3	0.201	0.167	0.831	−4.285	0.98	CC-TCN
		TCU089	9.0	0.248	0.191	0.774	5.580	1.08	CC-TCU
Kobe (1995)	6.9	Kobe Univ.	0.9	0.310	0.380	1.220	0.530	0.81	KB-KBU

Time interval between vertical and horizontal acceleration peaks.