Wind Resistant Design AIJ Recommendations for Wind Loads on ...
Wind Resistant Design AIJ Recommendations for Wind Loads on ...
Wind Resistant Design AIJ Recommendations for Wind Loads on ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Correcti<strong>on</strong> Factors<br />
Depending <strong>on</strong> Mode Shape φ<br />
• Ordinary buildings<br />
1−<br />
0.4ln β M<br />
φD<br />
=<br />
2 + β M<br />
2<br />
( )<br />
2<br />
M B + D<br />
φT<br />
=<br />
36I<br />
T<br />
M ⎛ Z ⎞<br />
φL<br />
= ⎜ ⎟<br />
3M<br />
⎝ H ⎠<br />
L<br />
β −1<br />
• Lattice Towers<br />
φ<br />
D<br />
=<br />
M<br />
M<br />
D<br />
⎛<br />
⎜<br />
⎝<br />
⎧⎛<br />
B<br />
⎨<br />
⎜0.5<br />
⎩⎝<br />
B<br />
5<br />
D<br />
0<br />
Z<br />
H<br />
⎞<br />
⎟<br />
⎠<br />
β −1<br />
( 1−<br />
0.4ln β )<br />
H<br />
Al<strong>on</strong>g-wind loads<br />
(1 − 0.4 ln β )<br />
Crosswind loads<br />
Torsi<strong>on</strong>al wind loads<br />
⎞ ⎫<br />
− 0.3<br />
⎟(<br />
β − 2) + 1.4⎬( 1−<br />
0.4ln<br />
β )<br />
⎠ ⎭Al<strong>on</strong>g-wind loads<br />
β<br />
⎛ Z ⎞<br />
µ = ⎜ ⎟<br />
⎝ H ⎠<br />
Mode shape<br />
Vortex Res<strong>on</strong>ance and<br />
Aerodynamic Instabilities<br />
• Particularly wind-sensitive<br />
buildings to satisfy following<br />
c<strong>on</strong>diti<strong>on</strong>s:<br />
H<br />
N<strong>on</strong><br />
≥ 4<br />
BD<br />
and<br />
f<br />
,<br />
⎛<br />
⎜<br />
⎝<br />
L<br />
f T<br />
U H<br />
N<strong>on</strong>-dimensi<strong>on</strong>al<br />
<strong>on</strong>set velocity<br />
H<br />
D<br />
B<br />
U<br />
⎞<br />
H<br />
* U<br />
H<br />
*<br />
≥ 0.83U<br />
⎟<br />
Lcr<br />
or ≥ 0.83U<br />
Tcr<br />
f<br />
L<br />
BD<br />
fT<br />
BD ⎠<br />
: Fundamental natural<br />
frequencies of crosswind<br />
vibrati<strong>on</strong> and torsi<strong>on</strong>al vibrati<strong>on</strong><br />
24
Change language