Posted by IRC 6-2014 is a standard for calculations of loads and stresses for road bridges. This standard stipulates criteria for calculations of Dead load, Live load, Impact load, Wind load, and seismic loads.
Download IRC 6-2014 with this link
Further downloads
Download IRC 5-2014 (section 1) general features and design
Download IRC 78-2014 (section 7) foundations and substructures
Also read “Types of bridges as per different criteria”
Also read Types Of Caisson Foundation For Bridges