Steel Design Load Safety Factors
Steel Design Load Safety Factors
(OP)
I'm a young Eng studying steel design for my PE exam. I'm very familar with LRFD method of live/dead load factors and their combinations. When using AISD method and tables are these same factors applicable. I have came across many different approaches. Is a 1.7(dead+live) factor too "safe"? Any literature on the topic would be appreciated.
Thanks
Auxblade
Thanks
Auxblade






RE: Steel Design Load Safety Factors
RE: Steel Design Load Safety Factors
I would say that when using the ASD method, you determine the actual stresses using the known loads and geometry of the structure combined with section properties of the members. No factors are applied to the loads. Dead load is 100% of the dead load, concentrated live loads are 100% of the concentrated live loads, etc. Load cases are determined using combinations of dead, live, seismic, external pressure, wind, etc. In some cases the load case summations involve factors but they are not to be confused with LRFD factors. Stresses like axial and bending are combined using formulas.
Allowable stresses are then either found in tables or calculated based on material properties and section geometry.
A comparison of "actual" versus "allowable" for the various load cases completes the analysis.
I hope that did not muddy the waters too much!!