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Stiffness and Concrete Pier Bent Moments

Stiffness and Concrete Pier Bent Moments

Stiffness and Concrete Pier Bent Moments

(OP)


All,
I am using a new (state-mandated) software package which gives me the option of applying a ratio of gross to cracked stiffness (Ig/Icr) for the columns of the concrete pier bent I am analyzing.  No factor is available to apply to the cap.

Is it realistic to analyze this frame with a cracked stiffness for the columns and a gross stiffness for the cap?  The Ig/Icr ratio for the columns will be about 3.5.

The pier bent in question is a conventional three column highway overpass 60 feet long, 20 feet high, and having approximately 3.5' x 3.5' columns and cap.

Peace,

Curvbridger  

RE: Stiffness and Concrete Pier Bent Moments

What's the ratio of the span of the cap to the length of the columns.  Many times the columns tend to be longer and have a much higher influence on the lateral displacement of the bent than the horizontal "beam" has.

You could also contact the program authors and ask for the reason.  

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