The figure shown has trusses 6m apart with midpoint sag rods and Purtins C150x12.5 spaced 2.5m on center. The roof truss is inclined 1 vertical to 2 horizontal. The weight of roofing materials is 0.9 kPa (includes self wt.), wind load is 0.8 kPa perpendicular to the roof surface, minimum roof live load is 0.6 kPa. Consider the roofing to provide full lateral support of the purtins. Fy=345 mPa. Use the NSCP 2015 specifications.

The figure shown has trusses 6m apart with midpoint sag rods and Purtins C150x12.5 spaced 2.5m on center. The roof truss is inclined 1 vertical to 2 horizontal. The weight of roofing materials is 0.9 kPa (includes self wt.), wind load is 0.8 kPa perpendicular to the roof surface, minimum roof live load is 0.6 kPa. Consider the roofing to provide full lateral support of the purtins. Fy=345 mPa. Use the NSCP 2015 specifications.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Structural components of framed construction

It is a rigid and stable framework of structures that consists of structural members like slabs, beams, and columns that can resist the deformation due to the self-weight and high external loads and transfer the applied loads safely to the substructure and consecutively to the ground. It is made of different materials, such as reinforced concrete, steel, and wood. In ancient days, load-bearing structures were used to build houses and houses were built using load-bearing walls.

Question

Which of the following best gives the purlin load wuy? See loaded purlin.
The figure shown has trusses 6m apart with midpoint
sag rods and Purlins C150x12.5 spaced 2.5m on center.
The roof truss is inclined 1 vertical to 2 horizontal. The
weight of roofing materials is 0.9 kPa (includes self
wt.), wind load is 0.8 kPa perpendicular to the roof
surface, minimum roof live load is 0.6 kPa. Consider the
roofing to provide full lateral support of the purlins.
F, = 345 mPa. Use the NSCP 2015 specifications.
2. 5m
2.5m
2. 5m
roofing
Wuy
TRUSS TOP CHORD
Truss Spacing = 6m
Wux
Purlins C150x12.5
Purlin Load
Wt A
kN/m mm^2 mm
C150x12.5 0.12 11400 12.7 152 5.1
SECTION
dtw by
Ix Sx
rx ly
mm mm^4 mm^3 mm mm^4 mm^3 mm mm^3 mm^3
48 8.7 143 1100 112 48.4 378 65.2 1230 574
Sy ry Zx| Zy
mm
mm mm
O 4.35 kN/m
5.56 kN/m
O 25.02 kN.m

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