Loads on Bridges- IRC 6 | BRIDGE ENGINEERING MODULE 4| STATE AE, AEE SPECIAL| TARGET IES

Road bridges and culverts shall be divided into classes according to the
loadings they are designed to carry.
IRC CLASS 70R LOADING: This loading is to be normally adopted on all roads on which permanent bridges and culverts are constructed. Bridges designed for Class 70R.
Loading should be checked for Class A Loading also as under certain conditions, heavier stresses may occur under Class A Loading.
IRC CLASS AA LOADING: This loading is to be adopted within certain municipal limits, in certain existing or contemplated industrial areas, in other specified areas, and along certain specified highways. Bridges designed for Class AA Loading should be checked for Class A Loading also, as under certain conditions, heavier stresses may occur under Class A Loading.
IRC CLASS A LOADING: This loading is to be normally adopted on all roads on which permanent bridges and culverts are constructed.
IRC CLASS B LOADING: This loading is to be normally adopted for timber bridges.
IRC CLASS SPECIAL VEHICLE SV LOADING: This loading is to be adopted for
design of new bridges in select corridors as may be decided by concerned authorities
where passage of trailer vehicles carrying stator units, turbines, heavy equipment and
machinery may occur occasionally. This loading represents a spectrum of special vehicles
in the country and should be considered for inclusion in the design wherever applicable.