SITUATION. A plate-and-angle girder is fabricated by bolting the short legs of four 125 x 75 x 13 mm angles to a web plate 1000 mm x 10 mm to form a section 1020 mm deep. Cover plates each 300 mm x 10 mm are then bolted to the flange angles making the overall height of 1040 mm. 300 10 20.7 땡 13 N.A. 1040 1020

Structural Analysis
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Chapter2: Loads On Structures
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SITUATION. A plate-and-angle girder is fabricated by bolting the short legs of
four 125 x 75 x 13 mm angles to a web plate 1000 mm x 10 mm to form a section
1020 mm deep. Cover plates each 300 mm x 10 mm are then bolted to the flange
angles making the overall height of 1040 mm.
300
10
20.7
729²
+13
N.A.
1040
1020
Properties of 125 x 75 x 13 mm angle:
Ix = 3.82 x 106 mm*
A = 2430 mm²
Iy = 1.04 x 105 mm*
y = 39.6 mm
Bolt Ultimate Shear Stress, Tuv = 100 MPa
Bolt Ultimate Bearing Stress, Tub = 200 MPa
1.
Determine the moment of inertia of the section about NA.
2.
Determine the pitch for the 22 mm-dia bolts, connecting the angles to the
web plate at a section where the ultimate shear load, Vu = 450 kN.
3. Determine the pitch for the 22 mm-dia bolts, connecting the angles and the
cover plates at a section where the ultimate shear load, Vu = 450 kN.
x = 20.7 mm
Transcribed Image Text:SITUATION. A plate-and-angle girder is fabricated by bolting the short legs of four 125 x 75 x 13 mm angles to a web plate 1000 mm x 10 mm to form a section 1020 mm deep. Cover plates each 300 mm x 10 mm are then bolted to the flange angles making the overall height of 1040 mm. 300 10 20.7 729² +13 N.A. 1040 1020 Properties of 125 x 75 x 13 mm angle: Ix = 3.82 x 106 mm* A = 2430 mm² Iy = 1.04 x 105 mm* y = 39.6 mm Bolt Ultimate Shear Stress, Tuv = 100 MPa Bolt Ultimate Bearing Stress, Tub = 200 MPa 1. Determine the moment of inertia of the section about NA. 2. Determine the pitch for the 22 mm-dia bolts, connecting the angles to the web plate at a section where the ultimate shear load, Vu = 450 kN. 3. Determine the pitch for the 22 mm-dia bolts, connecting the angles and the cover plates at a section where the ultimate shear load, Vu = 450 kN. x = 20.7 mm
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