A Generalized Intact Stability Analysis Procedure for Modular Construction Platforms
1991
Huang, T.
This report presents a generalized numerical procedure for evaluating the responses of a modular construction floating platform subjected to static loads. The theory employed is applicable to watertight pontoon platforms undergoing unlimited rotations. This procedure enables users to investigate platform stability under various deck load configurations. Users are able to design a pontoon platform with prefabricated modules, check the platform for static stability, and modify the platform in a sequence resembling the actual design process. This procedure has been automated in a FORTRAN program to relieve users of the tedious iterations for the exact submerged hull geometry. Theories employed, analysis scenario, and program organization are discussed. The functions of the subroutines are also described in detail. The results predicted by the numerical procedure are in general agreement with measurements obtained from a full scale at-sea test of a modular construction platform. The conventional closed from solution based on initial water plane geometry can seriously underestimate the rotational excursion of a platform, if the deck loads are a significant part of the total displacement, or their centers of gravity are high. The present theory, which accounts for the instantaneous water plane, will be used for evaluating the static stability of such structures.
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