Manometer 
 Test Section Size : c/s = 600mm x 600 mm   length = 200 mm
Maximum speed : 45m/s (ut re!uired on "5m/s # "$m/s %or test pro&ect'
one) com* size : 50mm x 50mm x 450mm +o,er : 22-./0+ 1 motor
Procedure
" 3ote initial manometer reading 2 Start ,ind tunnel and run it at approx "00rpm 3ote do,n manometere reading 2 4 ncrease rpm in steps o% "00 till it reaches "00rpm and note
do,n manometer reading during each step
Motor   Tunnel (nterior' 
 
Wind Load On Irregular Plan Shaped Tall Building :  A Case Study
• 1. Introduction
•  The uncertaint) regarding calculation o% ,ind load is !uite high due to the ast ranges o% possi*le interactions *et,een structure and ,ind
•  Thedeelopments o% ne, *uilding materials and construction techni!ues hae ena*led us to *uild ne, *uildings ,hich are tall and uns)mmetrical 3aturall) such structures are more suscepti*le to ,indloads
• structure7 under the action o% ,ind7 experiences t,o t)pes o% %orces iz drag and li%t .hile drag %orce is experienced along the direction o% 8o,7 later occurs perpendicular to it
• !peri"ental progra"
•  The experiment ,as conducted in the oundar) la)er ,ind tunnel haing dimension 20 m 920m9 0 m at .ind ;ngineering 1entre7 <epartment o% 1iil ;ngineering (T oor>ee'7 s per ndian standard %or ,ind load S: $5 (part ' ? "@$ at a geometric scale o% " :00 The upstream elocit) o%
 
• Mass and stiBness are the t,o properties that in8uence the
%re!uenc) o% i*ration o% the *uilding7 and so directl) relate to ho, much it s,a)s n order to mitigate this motion7 increasing
the mass is un%easi*le and impractical *ecause o% its negatie
results
• Cn the other hand7 increasing the stiBness o% the *uilding7
namel) the proper selection o% the structural s)stem is one o%
the most eDcient design approaches
•  The resistance o% tall *uildings to ,ind as ,ell as to
earth!ua>es is the main determinant in the %ormulation o% ne,
structural s)stems that eole *) the continuous eBorts o%
structural engineers to increase *uilding height ,hile >eeping
the de8ection ,ithin accepta*le limits and minimizing the amount o% materials
•  n eDcient structural s)stem can proide an eBectie means
o% controlling structural response to ,ind in lateral and torsional directions
• Cutrigger?*elt7 %ramed tu*e7 exterior *raced and *undled tu*e s)stems are the most eDcient structural s)stems against ,ind
loading asicall) there are three t)pes o% *uildings
 
Steel Buildings
  Most o% the tall *uildings hae steel structural s)stem due to
high strength to ,eight ratio ease o% assem*l) and Eeld
installation econom) in transport to the site7 aaila*ilit) o%
arious strength leels and ,ider selection o% sections
  #ein$orced concrete %uilding
  The inention o% rein%orced concrete increased the signiEcance in use o% concrete in the construction industr) to a great extend
mo*ilit) characteristics and its structural Ereproo% properties
  Co"posite %uildings
sta*ilized *) rein%orced concrete
 
 These are utilized in *oth steel and rein%orced concrete
construction igid %rame s)stem %or resisting lateral and ertical
loads hae long *een accepted %or the designing o% *uildings
  Braced $ra"e syste"s
 These are utilized in steel construction7 it resists horizontal loading and preents *ending o% columns and girders
  Shear &alled $ra"e syste"s
 These are utilized in *oth rein%orced concrete and composite
construction Shear ,alls ma) *e descri*ed as a ertical cantileered *eam ,hich resists lateral ,ind and seismic loads
  Outrigger syste"s
 These are modiEed %orm o% *raced %rame and shear ,all s)stems in comprises o% a central core including either shear ,all or *raced
s)stem7 ,ith horizontal outrigger trusses girders connecting the core to the external columns
  The $ra"e tu%e syste"s
t is the emplo)ment o% closel) spaced perimeter columns
interconnected *) deep spandrels t is an eDcient s)stem to
proide lateral resistance ,ith or ,ithout columns rectangular and s!uare *uildings and pro*a*l) its most eDcient use in these
shapes 1ircular7 triangular7 trapezoidal %orms could *e emplo)ed
as ,ell