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Because the weight is quite high, and the use is for supports, I will assume that you will use the same cross-section for the shelve columns (if there are any). In you use the same cross-section, you probably will not have a problem with buckling I am assuming RHS refers to Rectangular Hollow Cross-section. Regarding the process that you need to follow IMHO ...

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For HSS $2"$ x $2"$ x $1/8"$, $E = 29000 ksi, Ix = 0.486 in^4$ Assume uniformly distributed load. Let $w = 500 lbs/15 ft = 33.33 plf$, round up to $40 plf$ to include misc. weight. $\Delta = 5*w*L^4/384*E*I = (5*40*15^4*12^3)/(2*384*29*10^6*0.486) = 1.616"$ $\Delta \approx L/111, NG(*)$ (*) Range of usual deflection limits: Live Load: $L/180 - L/360$ Total ...

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No, it won't work. It won't even support it's own weight at that span. regardless of lateral support or cross bracing. It is easy to calculate what size steel tubing you neef. I estimate it needs to be at least 10 by 3 inches.

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I think the EURO code considered non-linear stress distribution, thus require a wider plate to flatten the stress other than the linear stress distribution assumption that would result in b_net = F/fy*t. The graphics below might help you to have a grab on where the edge parameters were coming from. https://eurocodes.jrc.ec.europa.eu/doc/2014_07_WS_Steel/...

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If you are interested in the variation in yield strength among the same grade of steel, the paragraph below might have answered your question, or lead you in a correct direction for further research. "Yield strength is a material property and therefore shouldn’t vary with thickness. However, due to processing methods, it often does vary by thickness.&...

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Although this is a very reasonable question and one would have expected to be prominently and explicitly stated in textbooks and in the industry, it is one that I've never actually seen (on the consumer end) answered. The reasonable answer to your question would be that the "nominal strength of S235" would refer to a relatively small percentile (...

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Some other answer have touched upon this, but I think it needs to be made explicit: Your mistake is in thinking that civil engineering is about making the lightest structure possible. It's not. Instead, it's about making the most cost-effective structure possible. Give me a material that weighs a billion tons per cubic centimeter but is cheap enough to let ...

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I will make a slight add to the answers given here already, as follows. Take the case of a bridge. When loaded, some parts of it will be in compression, other parts will be in tension. The designer's job is to manage the stress levels in the most cost-effective manner. If a certain amount of concrete is capable of handling the compressive stresses less ...

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For hot rolled , the thicker section cools slower so has coarser pearlite and coarser grain size because the grains have more time to grow larger during the slow cool. A secondary factor is the thicker section is worked less / less strain to refine grains. The lower strength affect of the slower cooling thick sections also occurs during normalize and quench ...

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There are at least two contributing factors to that: a) development of grains (the following is mainly an excerpt from this question ) and this Usually thinner steels exhibit higher yield points (see cold roll sheet catalog page.8) and ultimate tensile strengths (see Steel construction) because, sheets of steel, that come out of rolling processes (especially ...

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A partial listing ( in addition to the previous answer) ; for reinforced concrete only simple generic shapes are needed ( bars) while steel only needs "I" , "H" beams, gussets, fasteners, welding . Careful inventory control of the previous steel items. Coating of these shapes to reduce rust during construction. Inspection to verify the ...

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The most important advantage of reinforced concrete over pure steel structure is availability. Many countries/regions on earth rely on imports for general goods production needs, the cost of steel can run prohibitively high compared to concrete. The next advantage is weight. In certain types of structure weight counts, such as underwater powerhouse. However, ...

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