Comprehensive Design Example for Prestressed Concrete (PSC) Girder Superstructure Bridge
3. Flow Charts
Steel-Reinforced Elastomeric Bearing Design Flow Chart Text - Method B
- Determine movements and loads at pier support (S14.4) (Design Step 6.1)
- Calculate required plan area of the elastomeric pad based on compressive stress limit (S14.7.5.3.2) (Design Step 6.11)
- Determine dimensions L and W of the bearing, W is taken to be slightly less than the width of the girder bottom flange (S14.7.5.1) (Design Step 6.11)
- Determine material properties (S14.7.5.2)
- Check compressive stress. Determine the maximum allowed shape factor using total load and live load stresses for the assumed plan area (S14.7.5.3.2) (Design Step 6.1.2.1)
- Calculate maximum elastomer interior layer thickness, hri. (S14.7.5.1) (Design Step 6.1.2.1)
- Recalculate the shape factor (S14.7.5.1) (Design Step 6.1.2.1)
- Check compressive deflection if there is a deck joint at the bearing location (S14.7.5.3.3) (Design Step 6.1.2.2)
- Check shear deformation (S14.7.5.3.4) (Design Step 6.1.2.3)
- Check combined compression and rotation (S14.7.5.3.5) (Design Step 6.1.2.4)
- Check stability of elastomeric bearings (S14.7.5.3.6) (Design Step 6.1.2.5)
- Did bearing pass all checks?
NO - Change plan dimensions, number of layers, and/or thickness of layers and go back to 7
YES - go to 13.
- Determine steel reinforcement thickness, hs (S14.7.5.3.7) (Design Step 6.1.2.6)
END.