huangyhg

buckling load of a steel stud with eccentricity in codes?
i have a wall panel with light gauge thin walled studs with 0.8cm^2 effective area and klx =1m kly=1m klt=1m . it is used to support the load coming from several shelves (if uniform distribution is assumed 330kgf acting on stud). the panel and the shelves above it are moved several meters; somehow during this movement some eccentricity occured in the studs (i am pretty sure about this) i don't know the amount of eccentricity. same load is acting on the shelf. if i want to reanalyse the situation. should i only calculate the stress p/a+p*(delta)/wy (the eccentricity is in the weak direction of the studs, studs are c shaped by the way)? if this is done, the studs would be o.k. up to 1.2cm of top deflection. but i know that this deflection will cause the studs buckle (i think lateral torsional buckling will occur) very earlier than the load that i have calculated for the no eccentricity case (620kgf with fy=1900kgf/cm^2). i am pretty sure that the governing mode of failure will be the lateral torsional buckling whereas i include the effect of eccentricity only in max stress calculations. so the problem is how should i include the effect of this eccentricity in my stability calculations? what will be the knew buckling load? i remember from my special concepts of structural stability course, the solution passes through virtual work principles and there are some methods in book of galambos. but what i wonder is how do the codes approach to the problem, is there some kind of a formula or a simplified method in the codes for handling this?
i think there must be something in the ubc code when treating the limit loads that corresponds to your case, of course considering yours is a thin walled c. in short, if your load case is one contemplated in the code, a compliant check made along it should ensure you have not a limit strength problem from any source.
dear serdardundar,
i think you can learn some detailed informations and code specifications in cornell university civil and enviromental department research page. also you can ask from prof.dr.teoman pekÖz.
regards,

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