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## Content of IS 875 part 3

### 5 WIND SPEED AND PRESSURE

5.1 Nature of Wind in Atmosphere

5.2 Basic Wind Speed

5.3 Design Wind Speed ( V, )

5.3.1 Risk Coefficient ( kr Factor ) . . . . . .

53.2 Terrain, Height and Structure Size Factor ( kt Factor )

5.3.3 Topography ( kS Factor ) . . . . . .

5.4 Design Wind Pressure . . .

5.5 Off-Shore Wind Velocity . . . .-.

### 6. WIND PRESSURES AND FORCES ON BUILDiNg STRUCTURES

6.1 General . . . . . .

6.2 Pressure Coefficients . . . . . .

6.2.1 Wind Load on Individual Members ,.. . . .

6.2.2 External Pressure Coefficients . . . . . .

6.2.3 Internal Pressure Coefficients . . . .

6.3 Force Coefficients . . . . . .

6.3.1 Frictional Drag . . . . . .

6.3.2 Force Coefficients for Clad Buildings .. . . .

6.3.3 Force Coefficients for Unclad Buildings _. . . .

### 7. DYNAMIC EFFECTS . . . . . .

7.1 General 1.. . . .

7.2 Motion Due to Vortex Shedding . . . . . .

7.2.1 Slender Structures . . . . .

IS : 875 ( Part 3 ) â€“ 1987

### 8. Gust Factor ( GF ) or Gust Effectiveness Factor ( GEF] Method . . .

8.1 Application . . . . . . . . .

8.2 Hourly Mean Wind . . . . . .

8.2.1 Variation of Hourly Meâ€˜an Wind Speed with Height . . .

8.3 Along Wind Load . . . . . . l . .

### APPENDIX A

BASIC WIND SPEED AT 10 m HEIGHT FOR SOME IMPORTANT

### APPENDIX B

CHANGES IN TERRAIN CATEGORIES i.. . . . . . .

### APPENDIX C

EFFECT OF A CLIFF OR ESCARPMENT ON EQUIVALENT

HEIGHT ABOVE GROUND ( k3 FACTOR ) . . . . . .

### APPENDIX D

WIND FORCE ON CIRCULAR SECTIONS