Bridge Wind Analysis

Wind Loading on Deck in accordance with SDM

1Dynamic Pressure

Loaded Structures

q =kN/m2Unloaded Structures q =kN/m2

2Nominal Transverse Wind Load, Pt

Pt shall be acting at the centroids of the approprirate areas and horzontally 2a Nominal Transverse Wind Load w/o live load, Pt w/o live

Exposed Area, A1

For superstructure w/ solid parapets

Depth,d2=

m Length =

m A1

=m2Drag Coefficient, Cd

Breath,b =+

2x b=9.46/10.81/12.16=m

Depth,d2=m

b/d =Desgin structure for Cd =Pt w/o live load =x x =or =2b Nominal Transverse Wind Load w/ live load, Pt w/ live

Exposed Area, A1

For superstructure w/ solid parapets

Depth,d2=

m Length =

m A1=m2

0.589.461.23.82.20.831153458.333.15333

1.45

3.8345 1.45

1900.952.2 2.54.7115540.55.51

Drag Coefficient, Cd

Breath,b =+

2x =m

Depth,d2=m

b/d =Desgin structure for Cd =Pt w/o live load =

x x =or =3Nominal Longitudinal Wind Load,P L

P L shall be acting at the centroids of the approprirate areas 3a Nominal Longitudinal Wind Load w/o live load, P L w/o live All superstructures w/ solid elevation

P LS =x x x

=or

=3a Nominal Longitudinal Wind Load w/ live load, P L w/ live All superstructures w/ solid elevation

P LS =x x x =or

=P LL =x x

x =or

=P L w/ live

=+=or

=4Nominal Vertical Wind Load, Pv

Pv shall be acting at the centroids of the approprirate areas Exposed Area, A3

Breath,b =

+2x =m 1.5

8.30.589.464.72.01277

1.5

1.2540.5 1.45 1.2

972.90.25345 1.45 3.8475.2380.25345

1.45 1.2150.0750.5287.5250.125

400.28.30.589.461.80.4350.87250.125150.075

Length

=m A3=

x =m2

Drag Coefficient,C L

=m d

=m C L =4a Nominal Vertical Wind Load w/o live load, Pv w/o live

=x x =or =4b Nominal Vertical Wind Load w/o live load, Pv w/ live Pv =x x =or

=Summary

The four speparate case considered on com2

(a) Pt along

(b) P l in combination with +/- Pv

1159.461151087.91087.90.58875

768.6012.20.58875

3.81087.90.58875

2433.92.237250.70651.29.46

?Pl alone

(d)0.5Pt in combination with P l+/-0.5Pv

pet