A 50 mm x 100 mm purlin is used for a roof truss. Spacing of trusses is 3.5 m Weight of roofing sheets is 120 Pa Roof live load is 750 N/m² of roof area and ceiling load is 140 N/m² of roof area Spacing of purlins is 450 mm on centers. Inclination of the top chord is 30° from the horizontal The timber is 80% stress grade yakal. From table, E(yakal)=9780 MPa. Neglect the weight of purlins. 1. Which of the following most nearly gives the total vertical load, in N/m?
A 50 mm x 100 mm purlin is used for a roof truss. Spacing of trusses is 3.5 m Weight of roofing sheets is 120 Pa Roof live load is 750 N/m² of roof area and ceiling load is 140 N/m² of roof area Spacing of purlins is 450 mm on centers. Inclination of the top chord is 30° from the horizontal The timber is 80% stress grade yakal. From table, E(yakal)=9780 MPa. Neglect the weight of purlins. 1. Which of the following most nearly gives the total vertical load, in N/m?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A 50 mm x 100 mm purlin is used for a roof truss.
Spacing of trusses is 3.5 m
Weight of roofing sheets is 120 Pa
Roof live load is 750 N/m² of roof area and ceiling load is 140 N/m² of roof area
Spacing of purlins is 450 mm on centers.
Inclination of the top chord is 30° from the horizontal
The timber is 80% stress grade yakal.
From table, E(yakal)=9780 MPa.
Neglect the weight of purlins.
1. Which of the following most nearly gives the total vertical load, in N/m?
a. 455
b. 193
c. 270
d. 338
2. Which of the following most nearly gives the maximum bending stress, in MPa?
a. 15.6
b. 5
c. 12.5
d. 33.5
3. Which of the following most nearly gives the maximum deflection, in mm?
a. 33.5
b. 16.3
c. 47.5
d. 24.8
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