By Carlos Guedes Soares; International Conference on Marine Structures

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Extra info for Advances in marine structures : proceedings of the 3. International Conference on Marine Structures - MARSTRUCT 2011, Hamburg, Germany, 28 - 30 March 2011

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The magnitude of panel length b is also based on typical frame spacing values of similar vessels. The analysis performed was linear static, with uniform pressure applying totally or partially on panels with all four sides fixed. The analysis was performed only for steel panels. For each load case and panel geometry, the values of x-strain (εxx), y-strain (εyy) and x-stress (σxx) were calculated for both the “middle” and “quarter” positions, along with the maximum von Mises stress σVM of the whole panel.

The final decision on the dimensions of the sensors was taken however considering also technical issues related to the sensors characteristics and their capability to be properly protected from the environment. Actually, small strain gauges resulted to be less suitable for an employment in harsh environments and hence have been avoided. 5 Calibration of the system A calibration and zeroing procedure is required prior to the employment of the system. The evaluation of the “zero stress”, necessary for referring the measurements to their actual absolute values, has to be done in calm water in a well known (reference) loading condition, comparing the average strain measured by each sensor during a proper time interval with expected values provided by means of FE analyses.

Hull girder loads have been forced at a selected section of the central hold, applying “adjustment loads” to the fore section of the model. Particularly, the total vertical bending moment has been forced, for each loading condition, in the section experiencing the maximum value of still water bending moment. Figure 1 shows distributions of vertical bending moments due to steel weight, local loads (which include seawater pressure) and adjustment loads for one of the cases analyzed. The plot also reports the total bending moment distribution (both the one estimated before the calculation and the one actually obtained by FE analysis), which accomplish to the condition above mentioned, referred to “target” in the figure.

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