Analysis of Water Flow Pressure on Bridge Piers considering the Impact Effect
Table 1
Calculation method for water flow pressure in different design codes.
AASHTO
General Code
Fundamental Code
Load Code
Water flow pressure
Denotation of symbols
is water flow pressure; is the density of water; is resistance coefficient of bridge pier; is flow velocity of flood
is the normal value of water flow pressure; is the density of water; is the design flow velocity of flood; is the water proof of bridge pier; is the gravity acceleration; is the shape resistance coefficient of bridge pier
is the normal value of water flow pressure; is the density of water; is the design flow velocity of flood; is the water proof of bridge pier; is the gravity acceleration; is the shape resistance coefficient of bridge pier
is the normal value of water flow pressure; is the density of water; is the design flow velocity of flood; is the water proof of bridge pier; is the shape resistance coefficient of bridge pier
Values of the shape resistance coefficient
Hemicyclic pier
0.7
Pier with round end
0.6
Pier with round end
0.6
Pier with round end
0.52
Pier with pointed end
0.7
Pier with pointed end
0.67
Pier with pointed end
0.8
Square pier
1.4
Circular pier
0.8
Circular pier
0.73
Circular pier
0.73
Square pier
1.5
Square pier
1.33
Square pier
1.55
Wedge-shaped pier
0.8
Rectangular pier
1.3
Rectangular pier
1.47
Rectangular pier
1.5
Notes: [] in AASHTO, longitudinal resistance is defined as the product of the water flow pressure and the projected area of the bridge pier with respect to the water flow direction. [] In Load Code, the shape resistance coefficient of bridge pier should be multiplied by an influence factor . The influence factor denotes the effect of the depth of water, and it can be applied using the values in Table 2.
