Don't weld to the bottom plate. This will cause fatigue problems and some governing bodies won't allow it. See Fischer et al.
An alternative for strengthening (beyond making the section composite) is to add dwidag bars to the beams which are connected to anchorages at the abutments (connected...
Welcome to Canada, The Ministry of Transportation, Ontario (MTO) has published standard designs known as "structural standard drawings" the ssd's provide details for various performance level barriers. The current designs are based on crash-tests performed by AASHTO. More recent...
