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Constants in Building Design & Analysis

By: Haseeb Jamal / On: Feb 01, 2017 / Design of
Building Design & Analysis
 
 

Constants in Building Design and Analysis

Component or System

ASD Load Combinations

LRFD Load Combinations

Foundation wall
(gravity and soil lateral loads)

D + H
D + H + L2 + 0.3 (Lr+S) D + F[ + (Lr or S) + 0.3L"

1.2D + 1.6H
1.2D + 1.6H + 1.6L2 + 0.5(Lr + S)
1.2D + 1.6H + 1.6(Lr or S) + 0.5L2

Headers, girders, joists, interior load- bearing walls and columns, footings (gravity loads)

D + L“ + 0.3 (Lr or S) D + (Lr or S) + 0.3 L~

1.2D+ 1.6L2 + 0.5 (Lr or S) 1.2D+ 1.6(Lr or S) + 0.5 L2

Exterior load-bearing walls and columns (gravity and transverse lateral load)

Same as immediately above plus D + W
D + 0.7E + 0.5L2 + 0.2S4

Same as immediately above plus 1.2D + 1.5W
1.2D + 1.0E + 0.5L2 + 0.2S4

Roof rafters, trusses, and beams; roof and wall sheathing (gravity and wind loads)

D + (Lr or S) 0.6D + Wu2 D + W

1.2D + 1.6(Lr or S) 0.9D + 1.5WU5 1.2D+ 1.5W

Floor diaphragms and shear walls (in-plane lateral and overturning loads)

0.6D + (W or 0.7E)

0.9D + (1.5W or 1.0E)

Presumptive Load-Bearing Value (psf)

Soil Description

1.500

Clay, sandy clay, silty clay, clayey silt, silt, and sandy silt

2.000

Sand, silty sand, clayey sand, silty gravel, and clayey gravel

3.000

Gravel and sandy gravel

4.000

Sedimentary rock

12.000

Crystalline bedrock

In Situ Consistency, N

Loose2 (5 to 10 blows per foot)

Firm (10 to 25 blows per foot)

Compact (25 to 50 blows per foot)

Non Cohesive Soils

Gravel

4.000 (10)

8.000 (25)

11.000 (50)

Sand

2.500 (6)

5.000 (20)

6.000 (35)

Fine sand

1.000 (5)

3.000(12)

5.000 (30)

Silt

500 (5)

2.000(15)

4.000 (35)

Insitu Consistency, N1:

So ft3 (3 to 5 blows per foot)

Medium (about 10 blows per foot)

Stiff (> 20 blows per foot)

Cohesive Soils

Clay. Sand. Gravel Mixtures

2.000 (3)

5.000 (10)

8.000 (20)

Sandy or Silty Clay

1.000 (4)

3.000 (8)

6.000 (20)

Clay

500 (5)

2.000 (10)

4.000 (25)

 

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