https://communities.bentley.com/members/bb989b11_2d00_2d9d_2d00_440d_2d00_9dae_2d00_ac5968cd5a11DPaintin's recent activityen-USTelligent Community 12https://communities.bentley.com/products/bridge_design___engineering/f/bridgemaster-lars-leap-openbridge-rm-forum/102682/lars---lrfd-live-load-distribution-factors-for-ss-beams-with-a-non-composite-concrete-deckWed, 19 Nov 2014 23:38:25 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:501c31eb-01a0-4384-9275-19955447896cDPaintin<p><span style="font-family:arial,helvetica,sans-serif;font-size:inherit;">I am modeling simple-span steel beams with a non-composite concrete deck.&nbsp; What formulas should I be using to calculate the LRFD distribution factors?&nbsp; I note that when I let LARS calculate the factors, the factors calculated when I model it as CSC are different than when I model it as SS.&nbsp; The AASHTO LRFD Bridge Design Specifications Table 4.6.2.2.2b-1 does not appear to address steel stringers with a non-composite deck.&nbsp; The factors that LARS calculates for the CSC model agree with the formula for composite concrete deck in the table.&nbsp; I cannot figure out what formula is being used by LARS for the SS model.</span></p><div style="clear:both;"></div>