Based on parameters such as the materials shear modulus, diameter of the wire, mean coil diameter, and number of active coils (a
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Answer:
a) 50 mm
b) 808.24 MN/m
Explanation:
Given:
Thickness of each steel plate = 15mm
a) To find suitable length of bolt, we'll use:
Length of bolt = grip length + height of nut
To find the grip length since there is a washer, we'll use:
Grip length = plate thickness + washer thickness
Since we have 2 plates of 15mm thickness,
Plate thickness = 15 + 15 = 30mm
Using the table, a metric plain washer has a thickness of 3.5mm
Grip length = 30 + 3.5 =33.5 mm
Height of nut: Using table A-31, height of hexagonal nut is 12.8 mm
Therefore,
Length of bolt = 33.5 + 12.8 = 46.3
Rounde up to the nearest 5mm, we'll get 50mm
Length of bolt = 50mm
b) Bolt stiffness:
Threaded length for L ≤ 125mm
LT = 2*d + 6
Where d = 14mm, from table(8-7)
= 2*14 + 6
= 34 mm
Area of unthreaded portion:
Ad=
Length of unthreaded portion in grip:
Ld = 50 - 34 = 16mm
Length of threaded portion in grip:
Lt = 33.5 - 16 = 17.5mm
Bolt stiffness =
Bolt stiffness = 808.24 MN/m