Pushover Analysis Pile of ULA Jacket Platform Towards Earthquake Loads by SNI-1726:2012

Abstract

This study aims at analyzing pushover on pile jacket structure based on SNI-1726:2012 standards for earthquake loads. Push­over analysis or ultimate strength was performed on ULA jacket plat­form operated by PHE ONWJ. The jacket platform is operated in the northwestern part of the Java Sea. Design of earthquake loads on ULA jacket platform structure with large seismic accele­ration was obtained. From seismic analysis, dynamic response occurred on ULA jacket platform is evaluated, with natural struc­ture period of 1.256 seconds. The largest shear base values were in X and Y directions resulted from seismic acceleration of PGA 0.2g. On member check, the critical part happens to be one of the members of WD2, and on joint check, the largest UC occurred on 401L joint, both were due to the aforementioned earth quake ace­leration. Pushover analysis was then performed to obtain the value of RSR (Reserve Strength Ratio). The analysis yields an RSR value which far exceed the limiting criteria of API RP 2A WSD of RSR ≥ 0.8. Therefore it could be concluded that ULA jacket platform structure is within the range of low consequence category.