REDUCTION OF FATIGUE LIFE DUE TO EXCESS LOAD ON DUMP JETTY

• Main Author: IQBAL, MUHAMMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29253
• Institution: Institut Teknologi Bandung

<p align="justify">The mining location located in this maritime country makes mining companies use sea transport (barge) to move the cargo. The most efficient structure used for these activities is the dump jetty type using steel as primary construction material built using weld connection system. These welded connection system has a greater risk of fatigue failure than other connection systems due to stress concentrations, thus control for possible cracks in structural elements is a necessity. The objectives of this study were to assess the rate of fatigue crack propagation in elements experiencing maximum stress, and to identify the lifespan of fatigue in the elements. <br /> <br /> The approach taken in this study is to model the loads within the structure analysis program with various combinations that occurs to obtain the optimum cross-sectional design, followed by identifying the most vulnerable structural elements so that more specific object of study is obtained which mechanism of fatigue failure to be identified. The obtained data is applied into the welded connection model system using force as the control, the mechanism will cause reaction to the welding element to obtain the approach of S-N curve detail of the connection. The results obtained can be solved numerically to determine the most determined design criteria. <br /> <br /> The results showed, there are 4 typical elements at risk of fatigue. however, fatigue life only reviewed in the most potential elements. Using miner’s rule approach, fatigue life maximum obtained is81 years with damage factor control 0,123 as control, whereas fatigue life obtained using mechanical fracture is 108 years which controlled by = 643,21 Mpa > = 355 MPa. <p align="justify"> <br /> <br />