【正文】 rectangular, triangular and IBC (k=2). CONCLUSIONS After designing and detailing the reinforced concrete frame structures, a nonlinear pushover analysis and nonlinear dynamic time history analysis are carried out for evaluating the structural seismic response for the acceptance of load distribution for inelastic behavior. It is assumed for pushover analysis that seismic demands at the target displacement are approximately maximum seismic demands during the earthquake. According to Figures 2, 3, 4 and 5, for higher story frame structures, first yielding and shear failure of the columns is experienced at the larger story displacements and rectangular distribution always give the higher base shearweight ratio paring to other load distributions for the corresponding story displacement. As it is presented in Figure 6, nonlinear static pushover analyses for IBC (k=2), rectangular, and triangular load distribution and nonlinear time history analyses results for the chosen ground motion data (all of them are nearfield data) are pared. Pushover curves do not match with nonlinear dynamic time history analysis results especially for higher story reinforced pushover analyses results for rectangular load distribution estimate maximum seismic demands during the given earthquakes more reasonable than the other load distributions, IBC (k=2), and triangular. REFERENCES 1. ATC40 (1996), “Seismic evaluation and Retrofit of Concrete Buildings”, , Applied Technology Council, Redwood City, CA. 2. FEMA 273 (1997). “NEHRP Guidelines for the Seismic Rehabilitation of Buildings, Federal Emergency Management Agency”, Washington . 3. IBC (2020) “International Building Code”. 4. Prakash, V., Powell, G., Campbell, S. (1993), DRAIN 2D User Guide V , University of California at Berkeley, CA. 5. Li, . (1996), “NonLinear Time History And Pushover Analyses for Seismic Design and Evaluation” PhD Thesis, University of Texas, Austin, TX. 6. Vision 2020 Committee (1995). Structural Engineering Association of California, CA. Table 1. Ground Motion Data Used in the Analyses No Earthq. Date Source Record Pga Class Type No Earthq. Date Source Record Pga Class Type 1 Park field 06/28/1 966 CDM G C1232 0 B StrikeSlip 26 Cent ral Calif 01/20/1 960 USGS BHC H2 71 C 2 Morg a n Hill 04/24/1 984 CDM G GIL06 7 B Strik e S lip 27 Impe ria l Valle y 10/15/1 979 USGS HE03 140 D StrikeSlip 3 Koca eli 08/17/1 999 KOE R I ARC 00 0 B StrikeSlip 28 Impe ria l Valle y 10/15/1 979 USGS AE03 140 D StrikeSlip 4 Morg a n Hill 04/24/1 984 CDM G G060 90 B Strik e S lip 29 Kobe 01/16/1 995 OSA0 00 D Strik e S lip 5 Lytle Cree k 09/12/1 970 USGS WTW 115 B Reve r se Obliqu e 30 Kobe 01/16/1 995 CUE SHI0 00 D StrikeSlip 6 N. Palm Spring s 07/081 986 CDM G DSP 000 B Reve r se Obliqu e 31 Coyot e Lake 08/06/1 979 CDM G G030 50 C StrikeSlip 7 N. Palm Spring s 07/081 986 USGS FVR 04 5 B Reve r se Obliqu e 32 Northridge 01/17/1 994 USC BLF206 D Reve r se Norm al 8 N. Palm Spring s 07/081 986 USGS MVH UP B Reve r se Obliqu e 33 Westm or e lan d 04/26/1 981 USGS WLF UP D StrikeSlip 9 Santa Barb a ra 08/13/1 978 USGS SBA22 2 B Reve r se Obliqu e 34 Coyot e Lake 08/06/1 979 CDM G G043 60 C StrikeSlip 10 Whittie r Narr ow 10/04/1 987 CDM G BAL H 270 B Reve r se Obliqu e 35 Hollist r 11/28/1 974 USGS AHC H 27 1 C StrikeSlip 11 Anza (Hors e Cany) 02/25/1 980 USGS AZF3 15 A StrikeSlip 36 Impe ria l Valle y 05/19/1 940 USGS IELC 1 80 C StrikeSlip 12 Anza (Hors e Cany 02/25/1 980 USGS PFT1 35 A StrikeSlip 37 Coyot el Lake 08/06/1 979 CDM G SBJ UP B StrikeSlip 13 Anza (Hors e Cany 02/25/1 980 USGS TVY04 5 A StrikeSlip 38 Coyot el Lake 08/06/1 979 CDM G SJ3337 B StrikeSlip 14 Coyot e Lake 08/06/1 979 CDM G G013 20 A StrikeSlip 39 Coyot el Lake 08/06/1 979 CDM G SJ5337 B StrikeSlip 15 Hollist r 11/28/1 974 CDM G G012 47 A StrikeSlip 40 Impe ria l Valle y 10/15/1 940 UNA M /UC SD HAE P0 45 C StrikeSlip 16 Koca eli 08/17/1 999 ERD GBZ0 00 A StrikeSlip 41 Impe ria l Valle y 10/15/1 940 USGS HBR A3 15 C StrikeSlip 17 Koca eli 08/17/1 999 ERD IZT180 A StrikeSlip 42 Hollist r 11/28/1 974 CDM G ASJB 033 B StrikeSlip 18 Whittie r Narr ow 10/04/1 987 CDM G BOB R 270 B Reve r se Obliqu e 43 Hollist r 11/28/1 974 CDM G DSG 3 UP B StrikeSlip 19 Morg a n Hill 04/24/1 984 CDM G G013 20 A StrikeSlip 44 Impe ria l Valle y 10/15/1 979 USGS HPT S 315 B StrikeSlip 20 San Frans. 03/22/1 957 USGS GGP 1 00 A Reve r se Norm al 45 Impe ria l Valle y 10/15/1 940 USGS HCX O 22 5 C StrikeSlip 21 Whittie r Narr ow 10/01/1 987 USC AGR N 18 0 A Reve r se Norm al 46 Impe ria l Valle y 10/15/1 940 USGS HCH I 012 C StrikeSlip 22 Anza (Hors e Cany) 02/25/1 980 USGS RDA 045 B StrikeSlip 47 Lande rs 06/28/1 992 CDM G JOS09 0 B StrikeSlip 23 Cape Mendo.. 04/25/1 992 CDM G FOR 00 0 B Reve r se Norm al 48 Lande rs 06/28/1 992 USGS MVH 00 0 B StrikeSlip 24 N. Palm Spring s 07/081 986 CDM G PSA090 C Reve r se oblique 49 Liver. 01/27/1 980 CDM G BLM O3 55 B StrikeSlip 25 Coyot e Lake 08/06/1 979 CDM G G021 40 C StrikeSlip 50 Impe ria l Valle y 10/15/1 940 UNA M /UC SD HQK P 085 C StrikeSlip 60/60 3m fy= 22 kN/cm 2