Design Load & Service Load
Design Load & Service Load
(OP)
What is the difference between design load and service load? Please provide a definition.
Thank you!
Thank you!
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Design Load & Service Load
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RE: Design Load & Service Load
The current way, Ultimate Strength. The design load is the service load increased by specified load factors in order to provide a factor of safety.
Traditional Examples:
Service Load = Dead Load + Live Load
Design Load = 1.4 x Dead Load + 1.7 x Live Load
Reference: "Simplified Design of Reinforced Concrete - Fourth Edition", Harry Parker
RE: Design Load & Service Load
The service load is the load a structure would see on a daily basis when used as designed.
Failure does not mean on the ground. Buildings may reach failure, but still stand to allow people to exit safely.
Service loads reflect the daily loading of a structure and are most directly related to the comfort of the user of the structure.
A building designed soley on the basis of Ultimate or Design loading may be acceptable from the standpoint that it will resist failure to an acceptable point, but would be an uninhabitable building. Service loading directs one to deflection criteria amoung other things. A springy floor may be fine in an overall sense for capacity, but if the users of the structure are uncomfortable with a boucing deflecting floor the structure has "failed" from a serviceability standpoint.
Maybe this post is helpful or perhaps an overstatement of the obvious.
I am not trying to define loadings per any particular code, just more broad definitions.
Hope it helps.
Daniel
RE: Design Load & Service Load
ACI 318 specifies service load as load without factors.
So it depends on Code or book you are using.