Some measures are utilized for interchange ramp bridge maintenance,for instance increasing crashworthiness guardrail,replacing bearing,reinforcing crack in the underside of the board.

The spiral ramp bridge of the Second Fuling Wujiang River Bridge is designed as a double-deck loop structure with a radius of its roadway alignment 45.

Taken the structure parameters of a real ramp steel bridge as the calculation parameters,the horizontal force in pavement surfacing caused by steep longitudinal gradient and super elevation transverse gradient and its effect on stress and strain in interior structure were computed by FEM.