Positive Moment Capacity Calculation -- Top & Bottom Rebar


Document Information

Document Type: FAQ

Product(s): LEAP CONBOX/CIP RC/PT Girder

Version(s): All

Original Author: Bentley Leap Bridge Technical Support Group – VM

QUESTION:  In CONBOX Program, are only the rebar's that we identify as “bottom” rebar's considered for positive moment capacity or “top” rebar's are also considered in positive moment capacity calculations?


The default option selected in CONBOX is Strain Compatibility.

For Strain Compatibility all rebar's at top or bottom will be considered in ultimate moment capacity calculation.

When Equations option is selected only the steel on the tensile side of the section is used (H/2) for moment capacity calculation.