KINERJA STRUKTUR GEDUNG TINGGI DENGAN PEMODELAN COREWALL SEBAGAI DINDING GESER( STUDI KASUS : GEDUNG MATARAM CITY ) The Structural Performance of Multistory Building WithCorewall Modelling as Shear Wall(Case Study :Mataram City Building)

Indonesia is a country that is prone to earthquakes because located at the junction of the earth's tectonic plates, namely the Eurasian tectonic plates, the Pacific, the Philippines, and Indo-Australian. The earthquake caused damage to the building structure, even it effects in fatalities. So, a safe and strong building is a must. One way to maintain the structure stability is by using Shear wall either full or half wall (Schodek, 1999). Corewall is one kind of Shear wall. Shearwall placement must noted so it can work well. The purpose of this study is to discover shearwall placement at the most effective place based on serviceability limit and ultimate limit performance. The method that is used in this study is the dynamic response spectrum analysis by using ETABS.The research method begins by collecting building data to be analyzed as shop drawing, architects drawings, soildata, and other additional data. The modeling structure is done 2 times with SW1 corresponding to originalplan and SW2 coresponding to corewall, and then calculate the loading on the structure, like additional dead load (superimposed dead load), live load, and earthquake load. Earthquake load calculation based on soil type and location of building based on SNI 1726-2012. If all loads have been calculated and entered on ETABS, the next step is to run the ETABS where the results of the analysis or the output is displacement, drift, and base shear.Further the results of the analysis is controlled according to SNI 1726-2012 and Applied Technology Council (ATC-40). The maximum displacement of the building in the X direction is 0.1827m and in the Y direction is 0.1283m, so if it is viewed from the serviceability limit and the ultimate limit performance, it is categorized as a eligible building ( safely ) in accordance with SNI 1726-2012. SW2 is most effective shearwall placement based on displacement that occurs and serviceability limit and SW1 is most effective placement based on performance limit . The maximum total drift in the X direction is 0.00279and the Y direction is 0.00299. The maximum total inelastic drift in the X direction is 0.00277 and the Y direction is 0.00298, so if it is viewed according to ATC – 40, it is included in the level immediate occupancy category. Keyword : Shearwall, Response Spectrum.