Q1/ A composite beam is made of wood and reinforced with steel strap located onits bottom side. It has the cross-sectional area shown in fig. if the beam is subjectedto a bending moment of M=2kN.m, determine the normal stress at wood and steel.Take Ew=12Gpa and Est=200Gpa.150mmWooden20mmSteel150mm Q2/ The reinforced concrete beam has the cross-sectional area shown in figure if itsubjected to a bending moment of M=60 kips.ft, determine the normal stress ineach of the steel reinforcing rods and the maximum normal stress in the concrete.Take Est = 29*10° ksi and Ec = 3.6*10° ksi.12"Dr.16"1" diameter bars

Ans.2 The total area of the steel, Ast=2(3.14(0.5)2)=1.571 in2

Q2/ The reinforced concrete beam has the cross-sectional area shown in figure if it subjected to a bending moment of M=60 kips.ft, determine the normal stress in each of the steel reinforcing rods and the maximum normal stress in the concrete. Take Est = 29*10° ksi and Ec = 3.6*10° ksi. %3D 12"

Q2/ The reinforced concrete beam has the cross-sectional area shown in figure if it subjected to a bending moment of M=60 kips.ft, determine the normal stress in each of the steel reinforcing rods and the maximum normal stress in the concrete. Take Est = 2910° ksi and Ec = 3.610° ksi. %3D 12"

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter6: Stresses In Beams (advanced Topics)

Section: Chapter Questions

Problem 6.10.9P

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Question

Q1/ A composite beam is made of wood and reinforced with steel strap located on
its bottom side. It has the cross-sectional area shown in fig. if the beam is subjected
to a bending moment of M=2kN.m, determine the normal stress at wood and steel.
Take Ew=12Gpa and Est=200Gpa.
150mm
Wood
en
20mm
Steel
150mm

Q2/ The reinforced concrete beam has the cross-sectional area shown in figure if it
subjected to a bending moment of M=60 kips.ft, determine the normal stress in
each of the steel reinforcing rods and the maximum normal stress in the concrete.
Take Est = 29*10° ksi and Ec = 3.6*10° ksi.
12"
Dr.
16"
1" diameter bars

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