1. SHERINE RAJ AP/CIVIL ENGINEERING DEPARTMENT OF SCD

2. WIND LOAD ON BUILDING STRUCTURE
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

3. INTRODUCTION
Wind is essentially the large scale horizontal movement of free air.
It plays an important role in design of tall structures because it exerts loads on building.
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

4. WIND EFFECTS
WIND effects on structures can be classified as Static & Dynamic.
Static wind effect primarily causes elastic bending and twisting of structure.
Dynamic analysis is essential for tall ,long span and slender structures
Wind gusts cause fluctuating forces on the structure which include large dynamic motions including oscialltion.
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

5. VARIATION OF WIND PRESSURE
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
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6. FACTORS AFFECTING THE STABILITY OF HIGH RISE BUILDING
Factors affecting are lateral loads which include
Seismic force(Earthquake load) at the base of the structure.
Wind loads at the top of the building.
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

7. SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

8. WIND LOAD ANALYSIS Wind load analysis as per IS 875 (Part 3)-1987
Design wind speed (Vz)
Vb= Basic wind speed in m/sec (Based on
Appendix -A of various cities in IS
875 –Part 3)
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

9. WIND LOAD ANALYSIS SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

10. WIND LOADS IN STAAD-PRO
Two stages in Wind loads command
1. Define the wind load
2. Apply the defined wind load.
Note: The above “Define” command must be given immediately after the support command before giving any load command
DEFINE WIND LOAD
TYPE 1 (wind intensity in X Direction)
Intensity Height
Exposure
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

11. Apply the defined wind load
LOAD 1 (DL)
……….
LOAD 2 (LL)
………
LOAD 3 (WL in X Direction)
WIND LOAD X 1.0 TYPE 1
LOAD 4 (WL in -X Direction)
WIND LOAD X -1.0 TYPE 1
LOAD 5 (WL in Z Direction)
WIND LOAD Z 1.0 TYPE 2
WIND LOAD Z -1.0 TYPE 2
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

12. Load combination Load combination to be considered in Wind Load
1.5(D+L) = 1.5(D+L)
1.5(D+W) = 1.5(D+W in X +ve)
1.5(D+W in Z +ve)
1.5(D-W) = 1.5(D+ W in X -ve)
1.5(D+ W in Z –ve)
1.2(D+L+W) = 1.2(D+L+W in X +ve)
1.2(D+L+W in Z+ve)
1.2(D+L-W) = 1.2(D+L-W in X –ve)
1.2(D+L+W in Z –ve)
0.9D+1.5W = 0.9D+1.5W in X +ve
0.9D+1.5W in Z +ve)
0.9D-1.5W = 0.9D-1.5W in X –ve
0.9D-1.5W in Z-ve
Total load cases =13.
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017

13. Thank you
SHERINE RAJ WIND LOAD ON BUILDING STRUCTURE
24/7/2017