Below brief introduction for noise barrier wind load calculation for reference

Below brief introduction for noise barrier wind load calculation for reference

General situation:

For example: 2M height noise barrier; CC 2.5M distance; Install on flyover.

 1.Wind load calculate

F_wb=K_o× K₁ × K₃ × W_d × A_wh

Where

F_wb= Standard value of transverse wind load (kN)

W₀= Reference wind pressure (kN/m2)

W_d= Design the reference wind pressure (kN/m2)

A_wh=Cross windward area

V_5.5= The design base wind speed in the area where the bridge is located (m/s)

V_d=Design reference wind speed at height Z (m/s)

Z= The height above the ground (m)

Y=Air gravity density (kn/m3)

K₀=Design the conversion coefficient of wind speed recurrence period. For the cup beam of the large bridge with single hole span indes, k₀=1.0; for other bridge k₀=0.9; for Bridge in construction erection period, k₀=0.75; When the bridge is located in typhoon-prone areas, the K value can be moderately increased according to the actual situation.

K₃= Coefficient of terrain and geographical conditions, Generally K₃=1.0.

K₅=wind speed coefficient, k₅=1.38 to the surface of A,B,  for the C,D which is K₅=1.70.

K₂=The correction coefficient of wind speed height change considering surface roughness category and gradient; the correction coefficient K₂ of wind speed and height variation on the substructure of Bridges located in intermontane basins, valleys or mountain passes and other special occasions is determined according to class B ground category.

K₁=wind resistance coefficient;

G= gravitational acceleration, g=9.8m/s2.

The surface roughness can be divided into A, B,C,D.

Class A refer to the offshore sea surface and the island, coast, lakeshore and desert

Class B refer to fields, villages, forests, hills, towns and suburban areas with sparse housing.

Class C refer to urban areas with dense clusters of buildings

Class D refer to an urban area with a dense cluster of buildings and higher housing.

The area belongs to Class C, the height from the ground is 8.5m, found K₀=0.9; K₁=1.97; K₂=0.86; K₅=1.70; V_5.5=33m/s.

So F_wh = k₀k₁k₃W_d A_wh=12.63kN

2. Design value of horizontal force

S_wh=1.4Fwh=17.68(kN)

H steel max bending monment: M= 17.68×22.5=14.14(kN·m)

H steel column is made of 150x150x7x10mm national standard steel, allowable stree =215MPa, shear stress 125MPa, I_x=1660cm4, W_x=221cm3, A=40.55cm2

3.Calculation of bending strength

Meet requirement.

4.Deflection Calculation

Meet requirement

5. Whole stability calculation

Meet the requirement

Above load calculation for reference.