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117
IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 1
R. J. ELLWANGER
Figure 7 – Graphs
a
x I /I ratio for
1
C1 C
the examples with 5 and 10 floors
Figure 8 – Graphs
a
x I /I ratio for
1 C1 C
the examples with 20 and 30 floors
A concrete with
f
ck
= 25 MPa was adopted, resulting in an elastic-
ity modulus E
CS
= 23800 MPa. A total vertical load of 10 kN/m
2
per floor (characteristic value) was considered. A wind pressure
of 1,5 kN/m
2
(characteristic value), constant along the height, was
adopted, since it was the first experience with a formulation based
on a model with constant wind load.
Table 2 – General information about examples 1 to 8
Example
1
2
3
4
5
6
7
8
Floors number
5
5
10
10
20
20
30
30
Building height (m)
15
15
30
30
60
60
90
90
Spans number perframe
1
3
1
3
1
3
1
3
Frames number
0 to 3
0 to 3 0 to 3
0 to 3 0 to 3 0 to 3
0 to 5 0 to 5
Walls number
0 to 2 0 to 2 0 to 2 0 to 2 0 to 2 0 to 2 0 to 2 0 to 4
Table 3 – I /I ratios adopted in the examples
C1 C
1,00 0,95
0,90
0,85
0,80 0,70 0,60
0,50
0,40
0,20
0
Table 4 – Cross sections dimensions (cm)
Example
Beams
Columns
Walls
1
20 x 50 to 25 x 60
20 x 50 to 25x 60
20 x 88,5 to 20 x 201
2
15 x 34 to 20 x 50
15 x 34 to 20x 50
20 x 102 to 20 x 243
3
18 x 68 to 24 x 68
30 x 85 to 40 x 85
20 x 158,5 to 20 x 422,5
4
15 x 51 to 24 x 59,5
20 x 77 to 34x 90
20 x 224 to 20 x 481,5
5
34 x 85
42,5 x 140
20 x 307,5 to 25 x 838,5
6
21 x 68
34 x 96
20 x 351 to 25 x 957
7
34 x 85
42,5 x 140
20 x 418 to 35 x 1200
8
21 x 85
36 x 119
20 x 588 to 31 x 998,5