Portal Frame Design

Sheet1

EFFECTIVE LENGTH

Lr  B

Sway occurs Columns Jt A : pinned pinned base base k1 = 1 LCx = LCy =

C D

Lc

A

E

7.1 m

Rafter LR =

IC =

6.8 m 76200 cm

12.7 m

IR =

76200 cm

r xx =

22.1 22.1 cm

r xx =

22.1 22.1 cm

r yy =

4.67 4.67 cm

r yy =

4.67 4.67 cm

3

 

Lex

12.7 m

Ley

1.5 m

 Appendix E.4.1 Jt B kBA = IC / LC = k2 =

kBC = 1.5 Ir  / Lr 

10732Ic kBA

= =

9000Ir  

0.544

kBA + kBC Fig. 23

Lex / L = Lex = lx

2 14.2 m

= Lex / r xx =

Ley / L =

64.25

1

Ley = ly

for effective length in X-X axis

for effective length in Y-Y axis

6.8 m

= Ley / r yy =

145.61 USE

Rafters Jt B kBA = 1.5 IC / LC = k2 =

kBC = IR/ LR

16099Ic kBC

y for COLUMN DESIGN

= =

6000Ir  

0.272

kBA + kBC Jt C kCB = IR / LR = k1 =

kCD = 1.5 IR / LR

6000Ic kCB

= =

9000Ir

 

0.400

kCB + kCD Fig. 23

Lex / L = Lex = lx

Ley =

for effective length in X-X axis

14.9 14.986 86 m

= Lex / r xx =

Ley / L = ly

1.18 67.81

1

for effective length in Y-Y axis

1.5 m

= Ley / r yy =

32.12

Page 1

Sheet1 USE

Page 2

x for RAFTER DESIGN