الفهرس 
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Abstract
Analytical three dimensional finite element models for the Nagga Hamadii stoplog panels and the sandwich honeycomb panels are developed in order to study its structural behavior. Safety of results is maintained according to the allowable strength design (ASD) methodology according to ECP (2008). The prototype of the work is, firstly simulating the traditional stoplog panel using Sap (ver 2000) according to two cases of loading, case1 is the case of the panel under maximum water pressure, and case2 is the case of crane condition. According to case 2 the stoplog panel is under balanced condition, but in this study the stoplog is treated as vertical lift gate, so the panel is under water condition with 2.7 Ton/m2 water pressure
Secondly, the study of the honeycomb panel with different types of the honeycomb core including square, rhombus, hexagonal, and cylindrical shapes is performed according to case1, and case2 of loadings, by using three different sizes of the honeycomb cores. Three sizes of square honeycomb are used, size 1 is 40 cm * 40 cm, size2 is 60 cm * 60 cm, and size3 is 80 cm * 80 cm. The three sizes used for rhombus honeycomb are; size 1 34 cm * 40 cm diagonally, size2 51 cm * 60 cm diagonally, and size3 68 cm * 80 cm diagonally. According to hexagonal honeycomb, size 1 is 34 cm * 40 cm diagonally, size2 is 51 cm * 60 cm diagonally, and size3 is 68 cm * 80 cm diagonally. According to cylindrical honeycomb, size 1 is 40 cm diameter, size 2 is 60 cm diameter, and size3 is 80 cm diameter.Comparison between different sizes of each honeycomb type is performed by three different prototypes:
First, simulating each stoplog with varied thicknesses of the honeycomb component including the upper skin plate, the lower skin plate, and the honeycomb core at constant 100 cm depth subjected to case1 and case2 of loading.Second, simulating the stoplog panels with 5mm honeycomb core and adding additional stiffeners, with varied thicknesses of the upper and lower skinplates, with varied depths of the honeycomb panel to acquire the allowable stresses according to ASD according to case1 and case2 of loading.
Third, simulating the stoplog panels with varied thicknesses and depth of the honeycomb components to acquire the allowable stresses according to case1 and case2 of loading.