# Consider the box section in Figure 2. Assume that the skin/webs of the structure are fully effective in resisting direct

###### Question:

Consider the box section in Figure 2. Assume that the skin/webs of the structure are fully effective in resisting direct stresses do the following: a) Idealise the continuous structure to one with booms of the concentrated area and zero thickness shear webs. (Use 5 booms on the top and bottom; 3 booms on left and right sides) b) Calculate Ixx, Iyy, Ixy for the section c) For a shear load of 120 KN applied coincident with the front vertical web, calculate the shear flows around the section. d) Determine the shear centre (hint: use results from part c) e) Assuming that the box is made from 2024-T3 aluminum with ultimate shear stress allowable 269 MPa, calculate worst case shear margin of safety Consider the box section in Figure 2. Assume that the skin/webs of the structure are fully effective in resisting direct stresses do the following: a) Idealise the continuous structure to one with booms of the concentrated area and zero thickness shear webs. (Use 5 booms on the top and bottom; 3 booms on left and right sides) b) Calculate Ixx, Iyy, Ixy for the section c) For a shear load of 120 KN applied coincident with the front vertical web, calculate the shear flows around the section. d) Determine the shear centre (hint: use results from part c) e) Assuming that the box is made from 2024-T3 aluminum with ultimate shear stress allowable 269 MPa, calculate worst case shear margin of safety A4-100mm2 Al-A2-A3 All dimensions in mm A2 150 4 Аз A4 400 Figure 2

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