@article{Windu Partono_Masyhur Irsyam_Muhammad Asrurifak_Undayani Cita Sari_Sumarsono_2020, title={IMPROVEMENT OF STRUCTURAL ANALYSIS BY MODIFICATION OF SITE RESPONSE ANALYSIS AND EARTHQUAKE FORCE DIRECTION}, volume={19}, url={https://geomatejournal.com/geomate/article/view/1173}, abstractNote={<p>The seismic resistance design of buildings in Indonesia is usually performed based on the <br>most recent Indonesian Seismic Code (ISC). Improvement of the ISC will sometimes produce different <br>(increasing or decreasing) earthquake forces for building design. This paper describes the study of building <br>evaluation by conducting a modified Site Response Analysis (SRA) and a modified incoming earthquake <br>force direction. The modified SRA was performed as a result of in-complete soil boring investigation <br>through the bedrock elevation, using 30 m (soil boring investigation) and 50 m (microtremor investigation) <br>soil profile models. The earthquake force towards the building is computed using a pair (East-West/EW and <br>North-South/NS) of ground motion (acceleration time histories) models. Due to the unpredictability of <br>incoming earthquake forces, these models are improved by adjusting the ground motion direction to the <br>building by rotating a pair of ground motions from 0o to 180o at 10o intervals. The time histories were<br>developed according to the Deterministic (DSHA) and Probabilistic (PSHA) Seismic Hazard Analysis. The <br>analysis was performed by evaluating the moment capacity ratio of the building’s existing column <br>reinforcement in resisting the earthquake force. The surface time histories and spectrum accelerations <br>computed using the 50 m model is slightly higher (10%) than the same output calculated using the 30 m <br>model. In terms of the moment capacity ratio, the existing column reinforcement of the building is strong <br>enough to resist seismic earthquake scenarios, and the minimum value is observed when the ground motion is <br>rotated by 40o<br>.</p>}, number={75}, journal={GEOMATE Journal}, author={Windu Partono and Masyhur Irsyam and Muhammad Asrurifak and Undayani Cita Sari and Sumarsono}, year={2020}, month={Nov.}, pages={115–121} }