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Structural Analysis

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

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BuyFindarrow_forward

Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931
Chapter 16, Problem 24P
Textbook Problem
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Determine the member end moments and reactions for the frames shown in Figs. P16.24–P16.31 by using the moment-distribution method.

Chapter 16, Problem 24P, Determine the member end moments and reactions for the frames shown in Figs. P16.24P16.31 by using

FIG. P16.24

To determine

Find the member end moments and reactions for the frames.

Explanation of Solution

Fixed end moment:

Formula to calculate the relative stiffness for fixed support IL and for roller support (34)(IL).

Formula to calculate the fixed moment for point load with equal length are PL8.

Formula to calculate the fixed moment for point load with unequal length are Pab2L2 and Pa2bL2.

Formula to calculate the fixed moment for UDL is WL212.

Formula to calculate the fixed moment for UVL are WL230 and WL220.

Formula to calculate the fixed moment for deflection is 6EIΔL2.

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 relative stiffness KBA for member AB of the frame as below:

KBA=I20

Calculate the relative stiffness KBC for member BC of the frame as below:

KBC=(34)I15=I20

Calculate the distribution factor DFBA for member BA of the frame.

DFBA=KBAKBA+KBC

Substitute I20 for KBA and I20 for KBC.

DFBA=I20I20+I20=0.5

Calculate the distribution factor DFBC for member BC of the frame.

DFBC=KBCKBA+KBC

Substitute I20 for KBA and I20 for KBC.

DFBC=I20I20+I20=0.5

Check for sum of distribution factor as below:

DFBA+DFBC=1

Substitute 0.5 for DFBA and 0.5 for DFBC.

0.5+0.5=1

Hence, OK.

Consider sideway prevented:

Calculate the fixed end moment for BC.

FEMBC=2×(15)212=37.5kft

Calculate the fixed end moment for CB.

FEMCB=2×(15)212=37.5kft

Show the calculation of M0 moments using moment distribution method for side-sway prevented as in Table 1.

Show the free body diagram of the member AB and BC with horizontal reaction for with unknown load as in Figure 2.

Refer Figure 2,

Consider member BC:

Calculate the vertical reaction at the joint B by taking moment about point A.

+MA=0Bx1(20)14.128.2=0Bx1(20)=42.3Bx1=42.320Bx1=2.12k

Calculate the horizontal reaction at joint A by resolving the horizontal equilibrium.

+Fx=0Ax1+Bx1=0Ax12.12=0Ax1=2.12k

Calculate the unknown load R:

R=Bx1+25=2.12+25=27.12k

Consider sideway permitted:

Show the translation of the frame as in Figure 3

Write the expression to calculate the Fixed-end moment at AB and BA.

FEMAB=FEMBA=6EIΔ'(20)2

Assume the Fixed-end moment at AB and BA as 100kft

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