Staad question: difference between surface element, plate element, and shell element?

Anybody can explain  the difference surface element, plate element, and shell element in Staad? Thanks so much. Bruce

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  • Dear Sirs:

    Can anyone tell me how to interpret the results of Surface design in STAAD. I modeled a surface having opening and the reinforcement  summary mentions:- Horizontal, vertical and Edge Rebar. What is the meaning  of this edge bars. for my result, the value is very high 70-10 DIA. What could be the reason for it? Along, sides of opening, it says horizontal boundary element 1- 16 dia..what does it mean??

    Also under plate stress, I get MZ value along local X and local Y. How to interpret the same and why there are two MZ values. PL. EXPLAIN...Thanks in advance for support.

    Alok