Abstract

The Paper’s intent is to study and compare behavioral difference of loading on steel structures under\nocean transportation analysis and seismic analysis. This situation generally exists for a modularized steel structure (i.e.\nsteel structure fabricated in shop and transported for erection). As Modularization of structures is becoming a trend in\nengineering there is a need to investigate further aspects of structural engineering for its efficient design. The objective\nof this paper is to determine the governing action of load for design of modular steel structures due to ocean\ntransportation and seismic case for most of the seismic site classes.\nSeismic analysis consist of loading due to ground motion acceleration where as ocean transportation analysis consist of\nloading due to barge acceleration on ocean waves and deck flexing action of barge. The Nature of load application in\nboth the cases is similar however there is difference in structural behavior which is due to dissimilarity in Analysis\nparameters and amplitude of loading. This forms the basis for comparing behavior of structure during ocean transportation\nand seismic event.\nStructure considered for study is a Process module of onshore oil and gas facility. Seismic loading considered is as per\nASCE7-10. Seismic analysis is carried out based on Modal Response Spectrum method for site class D (Eastern Region\nof Asia - near Japan). Ocean transportation loading includes forces induced on structure due to deck flexing of barge (i.e.\nbarge deflects due to wave action) and forces acting on the structure due to acceleration of barge on ocean waves.\nSpecific data from marine engineering is used to evaluate ocean transportation loads.\nStatistics is prepared comparing force coefficients, base shears, structural drifts, member unities etc. These results will\npresent a relation of structural behavior during ocean transportation and seismic event for comparison purpose. To\nperform efficient design these results will allows engineer to highlight the most critical case of analysis governing the\ndesign.