Answered: why in the slope deflection method of…

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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why in the slope deflection method of step 1 is ic from (3) for MDC negative shouldn't it be positive?

im just trying to understand the concept.

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how does this relate to the original question, even in the answer it shows in this case for M_AB the theta B is positive. but in the question I asked earlier it showed this to be a negative theta in the base equation.

To draw a free body diagram of the given figure:
40 kN
Slope deflection method:
- 40×4
8
MAC
=
WR
8
=
A
MCA
McD = MDc=0
wl
MDF
8
MFD = 30 kN
MAC =0
MCA = -MCA-
20 3EI
MCA = 20+ + .(id)
20 kN
33
4
MDc=0+ -
-60 × 4
8
(Eli)
2EI
MCA = 30 +
McD = MCD
2EI
McD = 0+ -(2ic+id)
4
2EI
2 m
B
- 20 kN
MAC 3EI
+ -(ic
2
2EI
MDC=MDC + (2id-ic)
I
(2id-ic)
- 30 kN
-후)
(2ic+ig-30)
2 m
....(a)
.....(b)
.....(c)
4 m
D
2m
60 KN
E
2 m
F

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