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Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931

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Section
BuyFindarrow_forward

Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931
Chapter 15, Problem 28P
Textbook Problem
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15.24 through 15.31 Determine the member end moments and reactions for the frames shown in Figs. P15.24–P15.31 by using the slope-deflection method.

FIG. P15.28

Chapter 15, Problem 28P, 15.24 through 15.31 Determine the member end moments and reactions for the frames shown in Figs.

To determine

Find the member end moments and reaction for the frames.

Explanation of Solution

Fixed end moment:

Formula to calculate the fixed moment for UDL is WL212.

Calculation:

Consider the flexural rigidity EI of the frame is constant.

Show the free body diagram of the entire frame as in Figure 1.

Refer Figure 1,

Calculate the fixed end moment for BC.

FEMBC=1.5×20212=50kft

Calculate the fixed end moment for CB.

FEMCB=50kft

Calculate the fixed end moment for AC.

FEMAC=0kft

Calculate the fixed end moment for CA.

FEMCA=0kft

Chord rotations:

Show the free body diagram of the chord rotation of the frame as in Figure 2.

Calculate the length of AC by using Pythagoras theorem.

LAC=(202)+(152)=25ft

Calculate the chord rotation of the frame BC.

ψBC=C1CLBC=34Δ20=0.0375Δ

Calculate the chord rotation of the frame AC.

ψAC=CCLAC=54Δ25=0.05Δ

Calculate the slope deflection equation for the member AC.

MAC=2EIL(2θA+θC3ψAC)+FEMAC

Substitute 25 ft for L, 0 for θA, 0.05Δ for ψAC and 0 for FEMAC.

MAC=2EI25(2(0)+θC3(0.05Δ))+0=0.08EIθC0.012Δ        (1)

Calculate the slope deflection equation for the member CA.

MCA=2EIL(2θC+θA3ψCA)+FEMCA

Substitute 25 ft for L, 0 for θA, 0.05Δ for ψCA, and 0 for FEMCA.

MCA=2EI25(2θC+03(0.05Δ))+0=0.16EIθC0.012Δ        (2)

Calculate the slope deflection equation for the member CB.

MCB=3EIL(2θB+θCψCB)+FEMCB+FEMCB2

Substitute 20 ft for L, 0 for θB, 0.0375Δ for ψCB, and 50kft for FEMCB.

MCB=3EI20(2(0)+θC(0.0375Δ))50502=0.15EIθC+0.005625EIΔ75        (3)

Calculate the slope deflection equation for the member BC.

MBC=0

Write the equilibrium equation as below.

MCA+MCB=0

Substitute equation (2) and equation (3) in above equation.

0.16EIθC0.012Δ+0.15EIθC+0.005625EIΔ75=00.31EIθC0.006375EIΔ=75        (4)

Show the free body diagram of the entire frame due to sway force as in Figure 3.

Show the free body diagram of the member AC due to sway force as in Figure 4.

Calculate the horizontal reaction at the member AC due to sway force by taking moment about point A.

MA=0(SAC×25)+MAC+MCA=0SAC=MAC+MCA25

Calculate the reaction of the support C due to sway force by taking the moment about O

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