College of Engineering and Technology
Portfolio Activity Sheet
Module Title:
Structures 1
Structural Analysis and Design 1
Module Code:
4HX503
4HX504
Module Leader:
Syed Mohyuddin
Activity sheet no: 3
1. Select appropriate UB’s for the loading conditions shown below, using both elastic and limit state method of design.
fy = 165 N/mm2 py = 265 N/mm2
2. A short concrete beam is to be constructed without any steel reinforcement to span 2.8 m carrying an inclusive UDL of 20 kN. If the concrete has a safe tensile stress of only 0.6 N/mm2, state what depth would be needed for a suitable beam 200 mm wide.
3. For the same loading conditions as in Question 2, design a reinforced concrete beam if the beam remains 200 mm wide using the following stresses:
pcb = 10 N/mm2, pst = 140 N/mm2, m = 15
4. A series of reinforced concrete beams spaced at 5 m centres and spanning 7.5 m support a 175 mm thick reinforced concrete slab as shown below. The imposed floor loading is 3 kN/m2 and the load induced by the weight of concrete is 24 kN/m3, Design the beam using both elastic and limit state method.
fy = 250 N/mm2, fcu = 30 N/mm2
5. Calculate Slenderness Ratio (SR) for these columns, to decide if short or slender
1
2
3
4
Length (m)
4.2
5
3.5
Breadth (mm)
100
75
400
250
Depth (mm)
150
450
Fixing
Restrained
Unrestrained
SR
Short or slender
6. A brickwork column 400mm x 300mm supports the corner of a building (assume fixed top and bottom). The column is 3.5m tall and carries a load of 275kN. If the brickwork has an allowable bearing stress of 3N/mm2. Comment whether it is safe or not?
7. A post made from C14 class timber of 4.45 m effective length is required to support an axial load of 25kN. Determine suitable dimensions for the cross-section of the post.
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