The Derrick (Onshore) Structure Capacity Analysis In Wind Load Combination Effect Based On Sni 1729 2015

Abstract

Steel truss tower structures for onshore oil drilling infrastructure (derricks) had been located in oil-producing areas, Tarakan was one of them. Several tower structures as Petroleum Batavische Maschapiij heritage had been found in incomplete structure such in bracing elements lost. This research analyzed the incomplete tower structure capacity were based on SNI 1729-2015. The service load design (ASD) and the limit load design (LRFD) had been conducted in this research. The loading combination had accorded into SNI 1727 2013 with a research focused on the wind loads combination. The tower structure modeling used 3D truss element idealization by utilizing numerical software were based on the finite element method, SAP2000. The tower structure model had been classified into 2 consecutives model, named: the complete tower model (CD) and the incomplete tower model (ICD). The incomplete tower model was consisted of 3 representatives of the existing tower structure prototype in Tarakan City, respectively the Kampung Satu tower structure (ICM-K1), the Kampung 4 tower structure (ICM-K4), and the Kampung 6 tower structure (ICM-K6). The three incomplete derrick models had been distinguished by the number of bracing elements lost. The results showed that the capacity of the incomplete tower structure (ICM-K1, ICM-K4, and ICM-K6) had strong enough to accept a combination of wind loads. The service load design (ASD) had the conservative member capacity that the limit design (LRFD). The tension member capacity decreased due to number of bracing elements lost had more significant than the decreasing of the compression member capacity. The ICM-K6 model with the largest number of bracing elements lost had the lowest tension and compression member capacities.