Wind analysis of structure by SHYAMSUNDAR BOSU,INDIA

WIND ANALYSIS OF STRUCTURE

Why we choose this topic:

Increasing tallest structure rapidlyIncreasing tallest structure rapidly

Collapse due to wind loadCollapse due to wind load

:Contents:IntroductionEffects Zone Design EconomicPrecautionConclusion

Wind is a horizontal movement of free air.It plays an important role in design of structure because it exerts load on building.

HOW WIND WORKS:

wind flow measurement:wind flow measurement:

TYPES OF

WIND STORMS

Rotating windRotating wind

Non-Rotating windNon-Rotating wind

CYCLONIC STORM(400km/hr)

TORNADO(486km/hr)

HURRICANE STORM(120km/hr)

Roanu(85km/hr)Roanu(85km/hr)

Tallest structures: Tallest structures:

Top Tallest Buildings:Toronto's_CN_TowerToronto's_CN_Tower

Tokyo_Sky_TreeTokyo_Sky_TreeHong kong’s Twin TowerHong kong’s Twin Tower

More interesting facts and points on designing wind analysis structure:

1. How much Effects on structure……………….

2. Prone zones of wind speed………………

3. How to design wind load structure………..

4. How much economic and precautions are needed for design…………….

5. Discuss about newest researches and inventory conclusion…………………………..

To be continue…….To be continue…….

WIND LOAD AFFECTED STRUCTURES :

Tocoma Bridge, USTocoma Bridge, US(68km/hr)(68km/hr)

Cyclone HUDHUD, APCyclone HUDHUD, AP(195km/hr)(195km/hr)

BiharBihar(155km/hr)(155km/hr)

To be continue…….To be continue…….

WIND SPEED ZONE IN INDIA

* Wind speed and direction are inputs for calculation of evapotranspiration. Wind speeds arecontrolled by local pressure anomalies which in turn are influenced by temperature and localtopographic features.Generally the wind speed vs. temperature graph indicate this graph .** Wind speed exhibits a wide variation not only from place to place but also during the day. The wind direction may influence evaporation if the surrounding environment has different humidity in different directions.

To be continue…….To be continue…….

DESIGN OF WIND LOAD (as per IS:875.part 3)

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ECONOMIC LOSS WITHOUT CONSEDERING WIND ANALYSIS:Wind load is proportional to the square of wind speed so when the normal Wind load is proportional to the square of wind speed so when the normal

speed double then the wind load exerts four times load of wind speed on the speed double then the wind load exerts four times load of wind speed on the structure.structure.

Some examples are given into the following data where Some examples are given into the following data where various economic and many peoples died due to various economic and many peoples died due to

affects of windstorms….>>>>>>>>>>>>>affects of windstorms….>>>>>>>>>>>>>

86,000 peoples were died at Banquiu dam in 86,000 peoples were died at Banquiu dam in china,1975china,1975

226 peoples were died at Angers bridge in 226 peoples were died at Angers bridge in France,1850France,1850

120 peoples were died at Amarube rail road bridge 120 peoples were died at Amarube rail road bridge in Japan,1986in Japan,1986

To be continue…….To be continue…….

Precaution:Wind pressure is the principal force tending to Wind pressure is the principal force tending to disturb the structure stability of isolated walls disturb the structure stability of isolated walls greatest stress produced is at the bottom of a greatest stress produced is at the bottom of a wall where the wind exerts the greatest turning wall where the wind exerts the greatest turning

moment.moment.

Equating the resisting moment of the wall to the Equating the resisting moment of the wall to the moment due to wind pressure.moment due to wind pressure.

Unsymmetrical walls can be divided into two Unsymmetrical walls can be divided into two separate and each block tested for structural separate and each block tested for structural

stability as an independent unit.stability as an independent unit.

To be continue…….To be continue…….

CONCLUSION: Differences in design procedure

in different wind prone regions.Use of present technology.Using pre-fabricated units.Use of bundled tube.New improved structural systems.

Building Collapse vs TimeBuilding Collapse vs Time

After using wind load design on structureAfter using wind load design on structure

References: 1. https://en.wikipedia.org/wiki/Wind_engineering 2. https://en.wikipedia.org/wiki/Structural_load 3. https://en.wikipedia.org/wiki/Wind_speed 4. www.iitk.ac.in/nicee/IITK-GSDMA/W02.pdf 5. https://www.google.co.in/search?

q=how+does+wind+load+affect+a+structure&biw=1366&bih=657&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjWzLi95ZfMAhXHmpQKHRWKCykQ_AUIBigB

6. IS:875:1987 part3 7. www.youtube.com 8. www.google.co.in/wind analysis of structure images

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