2. Determine the required cross sectional areas of members BE, BF and EF of the given truss shown, if the allowable stress in tension is 120MPa while in compression is 105MPa. A reduced allowable stress in compression is given to reduce the danger of buckling. 4m 5m 3m B C O F 2m E 75KN 2m G 50KN 30 KN

2. Determine the required cross sectional areas of members BE, BF and EF of the given truss shown, if the allowable stress in tension is 120MPa while in compression is 105MPa. A reduced allowable stress in compression is given to reduce the danger of buckling. 4m 5m 3m B C O F 2m E 75KN 2m G 50KN 30 KN

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter8: Engineering Materials

Section: Chapter Questions

Problem 85CQ

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Concept explainers

Sizing Joists and Rafters

In civil engineering and building construction, joists and rafters are the major components including beams and columns. Almost every structural construction including buildings, skyscrapers, bridges, commercial complexes, and so on makes use of joists and rafters to provide structural integrity to the building. Joists are primarily thick long pieces of metals, concrete, or wood that are used to support the floor and ceiling. On the other hand, rafters form the major component of pitched roofs, which are a series of sloped long pieces extending from a ridged area that makes contact with the plane area of the wall. They account for the load-bearing of the building along with the beams.

Question

2. Determine the required cross sectional
areas of members BE, BF and EF of the given
truss shown, if the allowable stress in tension
is 120MPa while in compression is 105MPa. A
reduced allowable stress in compression is
given to reduce the danger of buckling.
4m
5m
3m
B
с
O
F
2m
E
75KN
2m
G
50KN
30 KN

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