Document Information

Document Type: FAQ

Product(s): LEAP BRIDGE STEEL

Version(s): All

Original Author: Bentley Technical Support Group -VM

QUESTION: How is the Lateral flange bending stress fl calculation is performed?

ANSWER:

Deck, Construction and finishing machine loads is used to compute moments M_lat and that load/moment will be passed into the code checker with the appropriate factors applied based on the user selected Strength load combination. 

For example -- The DC load factor is applied to the deck load and the DW load factor is applied to the construction loads and the finishing machine loads.

Calculation:

• W-Fact = DC(Deck) + DW(Const)
  •Ml_deck = (w-fact * Lb^2) / 12.0

Lateral flange bending stress fl calculation:

For top flange fl_top = (Ml-deck + Ml-fin) / Sy-top-flange
For bottom flange fl_bot = (Ml-deck + Ml-fin) / Sy-bot-flange