The COASTAL DRILLER, while drilling has a total weight of 15,435 kips. The LM are 1,975,680 ft-kips and the TM are -15,435 ft-kips. What is the starboard leg reaction?
• Total vertical reaction from all legs must equal the total weight of the unit • How longitudinal moment (LM) and transverse moment (TM) are balanced by different leg reactions • Using sum of moments = 0 about a convenient axis to solve for unknown reactions
• First, think about how many legs are carrying the total weight and how the total weight is shared among them before considering moments • Ask yourself: how does a transverse moment (TM) affect the difference between port and starboard leg reactions? Which side will carry more load? • Consider writing two equations: one for sum of vertical forces and one for sum of moments. How can you combine these to isolate the starboard leg reaction?
• Be sure you are using consistent units (kips, ft-kips) throughout your calculations • Confirm that your reactions add up exactly to the given total weight: 15,435 kips • After you compute a starboard leg reaction, check that it and the other leg(s) produce the given LM and TM when you take moments about appropriate axes
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