JAGBE Journal of Applied Geoscience and Built Environment, Vol. 2 No. 1 (2020) p. 1-7 Journal of Applied Geoscience and Built Environment Journal homepage: www.fazpublishing.com/jagbe e-ISSN : 2682-7476 *Corresponding author: shahruln@uthm.edu.my 2020 FAZ Publishing. All right reserved. Analysis of Seismic Response: A Case Study on Multistory Building S. N Mokhatar 1,a* , N. Ishak 2 , A. M. A Budiea 3 , A. F Kamarudin 4 , J. Hadipramana 5 , Z. M Jaini 6 and M. S Md Noh 7 1, 3, 4, 6, 7 Repair, Strengthening and Rehabilitation Structures Focus Group, Jamilus Research Centre, Faculty of Civil Engineering & Built Environment, Universiti Tun Hussein Onn Malaysia, 86400, Batu Pahat, Johor, MALAYSIA 2 Water Spectrum Sdn Bhd, 8915, Block B, Kelana Square, No. 17, Jalan SS7/26, Kelana Jaya, Petaling Jaya, 47301, Petaling Jaya, Selangor, MALAYSIA 5 Department of Civil Engineering, Faculty of Engineering, Universitas Muhammadiyah Sumatera Utara, 20238, Medan North Sumatera, INDONESIA *Corresponding author: shahruln@uthm.edu.my Email: a shahruln@uthm.edu.my Received 10 January 2020; Accepted 15 February 2020; Available online 29 March 2020 1. Introduction The earthquake was one of various earth phenomenon that can bring minor damage to total devastation towards development area. The sudden elastic energy that generated from a sudden slip of a fault induces ground tremors that can emit seismic energy. When the energy is released, it can cause an earthquake that happened when wave motion is moving through earth crust and generates many types of ground failure (landslides, subsidence, liquefaction) or tsunami. The seismic event happened in Malaysia is getting more often than a few years ago. This phenomenon can be threatening most of the structural condition in Malaysia. The structure that involves to seismic wave will experience repeated oscillations and building shear that can give stress on the weak element of the structure resulting in enormous failure or total collapse. These issues are getting a big concern from locals and some necessary authorities like consulting engineers. This issue is because most of the building in Malaysia are designed by ignoring the seismic considerations. As a primary source of concern, the threats of seismic forces should be understood by the various party. One of the seismic forces threats is the forces that gathered down at the base of buildings or often called as base shear. The base shear that always presents during an earthquake often became the main cause of the building’s deterioration. The natural frequency of an earthquake is also Abstract: Questions have arisen on the integrity of existing structures in Malaysia and their ability to withstand the earthquake loads since the experience of several tremors originating from bordering countries, especially from Sumatera, Indonesia. This paper was established modal analysis and seismic analysis by using the response spectrum method based on Eurocode 8 code of practice to answer the issue. The study was conducted by using computer simulation ETABS 2015 commercial software. An analysis was implemented towards one existing multistory building (eight-storey). The study aims to develop the mode shapes and estimate the base shear value of this building. In terms of shape or formation of structure, mode shape of mode one to mode five were showing a significant configuration and movement. Meanwhile, the mode shapes six until mode shape twelve were demonstrated an almost similar trend of failure, which is happened at the two ends of the building. The base shear value was analyzed by using commercial software and validated with manual calculation. The base shear value from the manual count is found to be exceeded 1.5% as provided in BS8110, where it gives information that this building may lead to structurally damaged during an earthquake. Further, the base shear value obtained from a computer simulation was well agreed because the amount is more significant than the base shear value from the manual calculation. Overall, based on the results, it can enhance a better understanding of the mode shape and base shear calculation for the multistory building. Keywords: seismic analysis, mode shape, base shear, ETABS software