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251/33310–15FE Reference Handbook 10.4 · Structural · ASD combinations
1. Simple-Beam Maximum Moment2. Elastic Beam Deflection3. LRFD Strength Combination4. Simple-Beam Maximum Shear5. Section Modulus6. Compact Steel Flexural Strength7. Whitney Equivalent Stress Block8. Rectangular RC Nominal Moment9. Basic ASD Load Combination10. Basic Tension Development Length11. Euler Column Buckling12. Tributary Area Load13. Influence Line for Simple-Beam Reaction14. Concrete Shear Strength Vc15. Steel Tension Member: Yielding and Rupture16. One-Way Slab Design Strip17. Steel Compression Member φPn18. Wood Beam fb = M/S vs Fb'19. Tied RC Column φPn,max20. Bolt Shear and Bearing21. Plastic Moment Mp = Fy Z22. Masonry Allowable Stress Unity Check

Handbook formula

Basic ASD Load Combination

Allowable-strength design compares service loads to allowable stresses. Handbook lists combinations such as D+L and D+0.75(L+W). Do not mix LRFD φ factors with ASD Ω on the same check.

Dead load
Live load
Wind

Step-by-step solved example

Service D = 20 psf, L = 40 psf. Basic D+L for ASD deck check?

beamtributary width s
Service load on the same tributary strip as LRFD, without φ.

  1. 1. Sum

    w = 20+40 = 60 psf service.

  2. 2. Contrast LRFD

    LRFD would use 1.2D+1.6L = 88 psf on the same occupancy.

Answer: 60 psf service (D+L)

10 practice questions

0/10 correct

1.ASD uses

2.LRFD 1.2D+1.6L vs ASD D+L: LRFD load is

3.Ω for steel tension yielding is

4.Do not combine

5.D = 10 k, L = 15 k. ASD D+L =

6.Snow S in ASD often appears as

7.Allowable bending stress for compact steel historically

8.Serviceability (deflection) is checked with

9.Earthquake E in combinations is specified by

10.If a problem says LRFD, use