Safety factors for simultaneous wave, tidal, dead and imposed loads
Safety factors for simultaneous wave, tidal, dead and imposed loads
(OP)
Hi all,
I'm designing an r.c column that is supporting precast concrete pedestrian bridge beams. The bridge spans over the mouth of a river and is supported from piles in the seabed. I have determined the wave, current, dead and imposed loads on the structure. Could anyone give me some guidance on what safety factors I should be using? I was unable to find anything in the British standards.
I'm designing an r.c column that is supporting precast concrete pedestrian bridge beams. The bridge spans over the mouth of a river and is supported from piles in the seabed. I have determined the wave, current, dead and imposed loads on the structure. Could anyone give me some guidance on what safety factors I should be using? I was unable to find anything in the British standards.






RE: Safety factors for simultaneous wave, tidal, dead and imposed loads
I recommend that you try to read FEMA-55 guidelines (Coastal Construction Manual: Principles And Practices Of Planning, Siting, Designing, Constructing, And Maintaining Residential Buildings In Coastal Areas) for piling to support structures built on coastlines. They have excellent guidelines and formulas. You can order them hard and soft copies free of charge directly from FEMA. Here is the link to do that”
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You also need to make sure that the piles will extend sufficient depth below scour depth. Your Geotechnical engineers should help you with this elevation.
Regards,
Lutfi
RE: Safety factors for simultaneous wave, tidal, dead and imposed loads
Also, I would think that there is some British standard out there regarding this....its not like there are no bridges over water on that particular island!
RE: Safety factors for simultaneous wave, tidal, dead and imposed loads
Regards,
Lutfi
RE: Safety factors for simultaneous wave, tidal, dead and imposed loads
When you've got those answers, use a 1.7 factor on wave loads and current loads per foot, probably use a 1.4 factor on the variable loads due to increase of height of the water surface, and 1.3 on dead loads. Use a beta of 0.83 on the combinaton to compute the loads.
RE: Safety factors for simultaneous wave, tidal, dead and imposed loads