Question
Download Solution PDFA steel plate is 30 cm wide and 10 mm thick. If the diameter of the bolt hole is 20 mm, then the net section area of the plate is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Net Sectional area:
When tension members are attached to the gusset plate, some material of plate is removed due to bolt/rivet hole. The net area at any section is equal to the gross area minus the deductions for holes at that section.
As per IS 800,
i. For a rivet upto 25 mm diameter:
Dia of rivet hole = Rivet Dia + 1.5 mm
ii. For rivet diameter > 25 mm
Dia of rivet hole = (d + 2) mm
Given:
d = 20 mm, B = 300 mm, t = 10 mm
Net sectional area = (b – nd0) x t
Where,
n = Number of rivet holes, d0 = Diameter of one rivet hole, t = Thickness of plate, and b = Width of plate.
Here, d0 = (20 + 1.5) = 21.5mm
∴ Net Sectional Area = (300 – 21.5) × 10 = 2785 mm2 ≈ 2800 mm2
Important Point:
Consideration of Net Sectional area makes conservative design.
Dia of holes in case of:
|
Rivet |
Bolt |
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Upto 25mm diameter rivet: Hole diameter = d + 1.5 mm For rivet diameter > 25mm Hole diameter = d + 2mm |
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