Frame of Struct

M.S MAHAFUZ SHAWON FAKIR B.Sc. In Civil Engineering

ID. 050 07732

Stamford University Bangladesh

FRAME

CHAPTER: 2

Stability & Determinacy

INTRODUCE DIFFERENT PART OF THE FRAME.

Not Frame

Frame

Here, Colum

n= Total Number of Frame

r = Minimum Number of Reactive Components

required for External Stability/Determinacy. Beam Reaction

One face open ,it’s frame

r=3n

ESSENTIAL FORMULA FOR FRAME.

STABILITY

r < 3n The Frame is Stable.

r ≥ 3n The Frame is Unstable.

DETERMINACY:

r = 3n The Frame is Determinate.

r > 3n The Frame is Indeterminate.

If Frame is Indeterminate, then

Degree of Indeterminacy (I) = r-3n

Determine the stability and determinacy condition for the following structure as shown in the figure.

Here, n = 3

r = 6+3*3 =15

3n= 3*3

= 9

Since, r > 3n The Frame is Stable. Since, r> 3n The Frame is Indeterminate.

I = r-3n

= 19-14 = 5°


Here, n = 2

r = 6+1*3 =9

3n= 3*2

= 6


I = r-3n

= 9-6 = 3°


Here, n = 7

r = 12+7*3 =33

3n= 3*7

= 21


I = r-3n

=33-21 = 12°


Here, n =3

r = 9+5*3 = 21

3n= 3*3

= 9


I = r-3n

=21-9 = 15°


Here, n =2

r = 9+3*3 = 18

3n= 3*2

= 6


I = r-3n

=18-6 = 12°


Here, n =4

r = 6+4*3 = 18

3n= 3*4

= 12


I = r-3n

=18-12 = 6°


Here, n =8

r = 15+8*3 = 39

3n= 3*8

= 24


I = r-3n

=39-24 = 15°


Here, n =6

r = 9+6*3 = 27

3n= 3*6

= 18


I = r-3n

=27-18 = 9°

SLAIDE MADE BY MSF

END

Frame of Struct

Engineering

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