Prestressed Concrete Pipe Wavespeed
Prestressed Concrete Pipe Wavespeed
(OP)
How do you calculate the wavespeed for surge analysis in a pre-stressed concrete pipe ? Is it affected by the stress in the pre-stressing wires ? (I know the thickness of concrete, thickness of steel cylinder and size and pitch of wires including the tension.)





RE: Prestressed Concrete Pipe Wavespeed
rule of thumb for stiff pipes 50 psi for ever 1 ft/sec in instanious change of flow, this value can be reduced to 40 or 45 for steel and PVC.
Hydrae
RE: Prestressed Concrete Pipe Wavespeed
RE: Prestressed Concrete Pipe Wavespeed
I would take issue with Hydrea on his statement that wave speed (celerity) is not much affected by pipe material and suggest speed is significantly effected by pip material. Celerity in plastic pipe may be as low as 450 m/sec.
Brian
RE: Prestressed Concrete Pipe Wavespeed
RE: Prestressed Concrete Pipe Wavespeed
Thorley is one of the most practiacl text books and includes curves of wave speed for a range of materials and stiffness. Unfortuantly I don't have my copy of Thorley with me as I am on an assignment in Beirut but I can give you details next week if no one else responds before then
Brian
RE: Prestressed Concrete Pipe Wavespeed
I'm ok with wavespeed equations, modulus etc. But I thought I knew Thorley's book inside out, so I'll have another look there when I'm in the office.
Thanks Brian
Pat