TRIBOLOGICAL STUDY OF THREE-BODY ABRASIVE WEAR PHENOMENON ON A356 ALUMINIUM ALLOY
In the process of building and maintaining an offshore platform, an assessment in the form of a structural feasibility study is required to ensure that the platform is fit for operation. The main structural feasibility studies include evaluation by in-place structural analysis, seismic, and fatig...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/77091 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In the process of building and maintaining an offshore platform, an assessment in
the form of a structural feasibility study is required to ensure that the platform is fit
for operation. The main structural feasibility studies include evaluation by in-place
structural analysis, seismic, and fatigue calculations. In this Final Project, the
modeling of a four-legged platform at a water depth of 55 meters located in the
Java Sea is carried out. In the design process, a structural feasibility study is
conducted with in-place, seismic, fatigue analysis, as well as a special task of
calculating the structural strength reserve (pushover). The platform feasibility
study was evaluated with SACS software with standards in accordance with API
RP 2A 22nd Edition and AISC - Steel Construction Manual 15th Edition. The study
begins with an inplace analysis to ensure the structure can withstand loads during
operation, both gravity loads, environmental loads, and loads during extreme
environmental conditions. Furthermore, structural evaluation by seismic analysis
is checked for SLE and DLE condition to estimate the strength of the structure
against ground motion at the installation site. Then proceed with fatigue analysis
to estimate the risk of failure, damage, and age of a structure caused by cyclic loads.
Furthermore, pushover analysis will be carried out in each lateral direction due to
earthquake loads (seismic pushover) to find the reserve strength capacity of the
structure when an earthquake occurs. Based on the results of inplace, seismic, and
fatigue analysis, the structure has met all API RP 2A criteria so that it is categorized
as feasible to operate. In the pushover analysis, it is known that the Reserve Stregth
Ratio (RSR) in the X+ lateral is 6.20, in the X- lateral direction is 6.53, in the Y+
lateral direction is 6.34, and in the Y- axis is 6.35. So that the structure has a high
reserve capacity in the event of an earthquake and has met the API RP 2A criteria.
The cause of the collapse in the analyzed structure is that there are several members
in the leg and pile that have been plasticized so that the displacement value becomes
large then the structural strength decreases until it finally causes collapse. |
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