fire exposure affect on load capacity

huangyhg

fire exposure affect on load capacity
i am looking for information regarding structural load carrying capacity in typical exposed steel construction.
q1: what is the typical (or minimum required) load safety factor built in to a typical steel building? (1.2, 1.5, 2, etc.)? only consider the loading of the building and components therein. do not consider rain, snow, wind, seismic loading.
q2: when exposed to fire, at what temperature is the steel's load carrying capacity reduced to 75%? 50%? 0?
q3: when exposed to fire, at what temperature does the steel begin to fail, buckle, collapse?
keep in mind, the focus is on typical or most common steel construction. if you need more information, please let me know. these questions may be easily answered in reference material, but i haven't been able to locate any. thanks for your help.
scott

in bs 5500 there is a table of yield strengths for various steels at different temperatures. this would give you an idea as to how the strength decreases with increasing temperatures.