Leap Steel cross frames forces

LEAP Bridge Steel uses the methodologies developed in NCHRP Report 725 “Guidelines for Analysis Methods and Construction Engineering of Curved and Skewed Steel Girder bridges” to analyze cross frames in grillage models. The user is referred to Section 3.2.3 “Improved Equivalent Beam Cross-Frame Models” and Section 3.2.4 “Improved Calculation of I-Girder Flange Lateral Bending Stresses from 2D-Grid Analysis” as these specific methodologies are employed by LEAP Bridge Steel.

Cross Frame analysis results for dead load and live load are reported in the form of equivalent cross frame beam end moments and shears by load case in the Analysis -> Cross Frame Forces command. Additionally the individual cross frame member forces are reported in the Analysis -> Cross Frame Detailed Forces command.

The cross frame end moments are used to determine the flange lateral bending moments and stresses as described in Report 725, Section 3.2.4.

For more information please check Leap Bridge Steel help.