ÖVERSLAGSDIMENSIONERING AV PLATTRAMBROAR Optimering av produktionskostnad och miljöpåverkan

This study aims to make a preliminary design of an integral bridge with frame abutments, and to see how the frame’s thickness for common spans and heights affects cost and environmental aspects. This is done to give a better starting point when designing slab bridges in future projects. A slab bridge is modelled and analysed with the use of the computer software BRIGADE/standard with parameters such as length, height and frame thickness being varied. Eight result lines, along and across the bridge frame, are chosen and the reinforcement needed is calculated with the ConcreteDesigner beam software. These are used for estimating the total steel reinforcement needed for the frame. The frame’s steel reinforcement is studied to assess how the different parameters affect the amount of reinforcement needed, and if it is possible to estimate the amount of reinforcement needed for a bridge of different dimensions. With the estimated necessary reinforcement together with the calculated amount of concrete, it is investigated how the cost and environmental effects are affected by having the cross section thinner or thicker. The study shows that both the production cost and the environmental effects are lowered by having a thinner cross section, i.e. it is cheaper to build in a more environmentally friendly way.