Structural Engineering Task

High Level Storage

Task:

1  To access the high level storage a fixed position crane is required 3 metres from one wall. The maximum load will be 2 tonnes

Two possible options are a 3m cantilever support or a 6m encastré beam.

For both options calculate the magnitude of shear force and bending moments.

2  A 3m column with fixed ends will support part of the storage. A worst case compressive load of 600kN has been estimated by the manager.

i.Select a suitable I section from the BS4 to ensure the slenderness ratio is below 100.

ii.Check that the beam you selected can cope with the direct compressive load. You may assume concentric loading conditions and compressive yield strength is 250MPa.

Note: A safety factor has already been included in the value of the load.

3 a)A 2m long solid shaft has a diameter of 30 mm and is used to transmit a power of 25kW at 1000 rpm.

Determine:

i.  the maximum shear stress in the shaft
ii.the angle of twist over a length of 2 m.

b)An alternate shaft design has been proposed using a hollow shaft with the same external diameter and an internal diameter of 10mm.

Recalculate the shear stress and angle of twist and comment on the suitability of the new design.