Jazan area is located in the most active seismic zone region of the Kingdom of Saudi Arabia where there is a Concrete Building complicated geological structures and tectonics. This project reviews Concrete Building the seismic activities occurred in Jazan area together with reviewing the Saudi Building (Seismic) Code (SBC-301-2007) [1]. A multi-story reinforced concrete building, in Jazan city, was seismically analyzed using the Equivalent Lateral Force Procedure with the aid of STAAD PRO software. The building, which was Ordinary Reinforced Concrete Moment Resisting Frame (ORCMRF), was analyzed in compliance with the provisions of (SBC-301-2007) [1]. The most important parameters governing the analysis of this frame were dead load, live load and seismic loads. Seismic loads were computed as pairs of accelerations versus times. The damping ratio was taken as 0.05 (5% of the critical damping). The ground accelerations versus time periods were calculated using SBC-301-2007 together with parameters necessary to be used as input data for the program to calculate the seismic parameters, i.e., reactions, displacements, base shear, bending moments, shearing forces, drifts. The obtained results show effects of earthquake ground motions on building studied herein are so greater for the higher increases of the values of outputs resulting from seismic loads comparing to that due to static load only. Finally, the results obtained, clearly, show the importance of taking the Saudi seismic code provisions into account when analyzing and designing multi-story buildings in Jazan area.
Jizan, or more properly Jazan, was known in ancient times as Almikhlaf Alsulimani. Jazan is located on the southwest corner of Saudi Arabia on the coast of the Red Sea and directly north of the border with Yemen. Jazan City lies in an active zone of earthquakes classified as zone 2B with maximum applied horizontal acceleration of 0.2 g. Saudi Arabia is divided into 25 zones; each zone has its specific building code covering not only seismic activity but other criteria as well.
The Province of Jazan lies in the south west section of the Kingdom of Saudi Arabia. It has a population of approximately 1,365,110 at the 2010 census and covers an area of 40,000 km2 including some 5000 villages and cities. Jizan, is home to the Port of Jizan, Saudi Arabia’s third most important port on the Red Sea. It stretches some 300 km along the southern Red Sea coast, just north of Yemen. The region includes over 100 islands in the Red Sea. The Farasan Islands, Saudi Arabia’s first protected wildlife area, is home to the endangered Arabian gazelle and, in winter, receives migratory birds from Europe.
Many researches and studies, in this area, have been conducted relating to Saudi Arabia in general and southwestern Saudi in particular such as: S.A. Ashour and H.H. Abdel-Rahman, in 1994, who presented a paper on “Application of Seismic Risk Analysis and Earthquake Simulation Methods to the Western Region in Saudi Arabia” [2] .
A comparative study on seismic provisions made in UBC-1997 and Saudi building code (SBC-301-2007) for RC buildings was prepared by Nazar and M. A. Ismaeil (2014) [3] . A technical report on “Earthquakes Data Base of the Arabian peninsula” was written by Abdullah M. Alamri in 1998 [4] . The report describes the seismological problems associating with rifting in the Red Sea and the geometry of the plate margins in the west and southwest. Abdullah M. Al-Amri, Arthur J. Rodgers, Tariq A. Al-Khalifa, presented a paper on “Improving the level of seismic hazard parameters in Saudi Arabia using earthquake location”, (2008) [5] .
Awad Ali Al-Karni (2009) [6] , studied the evaluation of the liquefaction potential of the soil at the location of Jazan university in Jazan city which lies on the east side of Red Sea. M.N. Fatani and A.M. Khan (1993) [7] , presented a conference paper on “Foundation on salt bearing soils of Jizan”, in order to present the geotechnical aspects of the area concentrating on the foundation design and construction practice. Furthermore, the geotechnical aspects of Jazan soil were studied by many authors as (Dhowian et al., 1987 [8] ; Erol, 1989 [9] ; Dhowian, 1990 [10] ; Al-Shamrani and Dhowian, 1997) [10] .