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Table 1 Comparison of tested to theoretically computed strengths of braced frames.

From: Effective Length of Reinforced Concrete Columns in Braced Frames

Author

Frame desig.

f c (MPa)

Reinf. steel, f y (MPa)

Reinforcing steel ratio

Slenderness ratio

Col. e/h

Ultimate strength

Tested to computed strength

ρcol

ρbm

Col. ℓ/h

Beam ℓ/h

Tested strength (kN)

Computed strength (kN)

       

Axial loads

 

Breen and Ferguson (1964)

F1

27.9

349.1

0.017

0.045

30

30

0.300

240.0

220.3

1.090

F2

21.0

344.8

0.017

0.044

30

30

0.100

262.2

266.9

0.983

F3

26.7

344.8

0.017

0.041

15

30

0.300

271.1

248.7

1.090

F4

22.5

344.8

0.017

0.040

15

30

0.100

371.1

344.9

1.076

F5

25.9

344.8

0.017

0.044

30

30

0.100

320.4

328.2

0.976

         

Axial loads

 

Furlong and Ferguson (1966)

FF1

23.9

349.7

0.018

0.065

20

17

0.116

266.7

271.3

0.983

FF2

29.7

378.6

0.018

0.065

20

31

0.106

273.8

316.1

0.866

FF3

23.0

394.5

0.018

0.065

20

31

0.337

176.4

177.8

0.993

FF4

22.3

372.4

0.018

0.065

20

17

0.222

233.3

195.6

1.193

FF5

22.3

364.1

0.018

0.065

15

37

0.097

246.7

302.9

0.814

FF6

24.5

349.0

0.018

0.065

15

37

0.320

202.2

201.6

1.003

         

Axial loads

 

Blomeier and Breen (1975)

B2

62.8

385.5

0.012

0.038

15

26

0.100

534.7

537.3

0.995

B3

38.7

381.4

0.012

0.038

15

26

0.100

443.6

374.0

1.186

  1. Note For 13 braced frame tests, average strength ratio = 1.02, coefficient of variation = 0.11.