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Hello to all, Here is something that's been troubling me lately: There is a huge variation in BCCR between lowermost and topmost floor. I have attached snaps with details also. I see that the Column capacity at top floor is very low as compared to lower ones. Why is there such variation? Am I interpretating the results the correct way???

Use MBMA (http://www.mbma.com) guidelines and codes. You need to consider inertia forces from crane to supporting structure that would be applied when the crane stops. All that information is in MBMA guideline. You can also check out the Canadian CISC Crane Supported Structures Guideline. It is freely available, so I have attached it. CISC_crane_support_steel.pdf

Well explained by Uzair. Generally, whenever you see more reinforcement on top, it indicates either the beam is doubly reinforced or it is continous. In your case, it appears the beam is singly reinforced as nominal steel is present on top.

Salam, I'm looking for books with steel structural behavior (especially buckling). If anyone could suggest me some of books according to Euro-code. Many Thanks, A.Malik

WA, 1. Basic information regarding bucking analysis of structural steel elements is generally available in the books dealing with the stability of steel structures. For example, "Guide to Stability Design Criteria for Metal Structures', 6th edition by Ziemian, 2010. 2. Specifically, in relation to Eurocodes, following links may be helpful in providing the desired information:- a. Design of Steel Structures: Eurocode 3 b. Designers’ Guide to Eurocode 3: Design of Steel Buildings c. Buckling resistance of steel & composite bridge structures-SCI 2012 d. Guide on second order analysis-2009 HTH Regards.

Check the one way shear and two way shear to determine the thickness, you could do the slope thickness variation btw (thicker near the column).

For local behavior, the beam should do just fine.

Yes, provided you know (or able to estimate) the concrete compressive strength & reinforcing steel yield strength. Calculate required maximum steel area per code (corresponding to Maximum Steel Ratio in tension), for the given beam size & compare it with the actual (provided) steel area. In case actual steel area in tension zone is more than the Code Permitted Maximum steel area, and the reinforcement area provided in compression zone is at least equal to the excess amount of reinforcement area provided in tension zone (= the difference of actually provided minus Code Maximum steel area in tension), the given beam will be a doubly reinforced beam. Regards.