How ideCAD defines the structural system type, response modification coefficient R, deflection amplification factor Cd, and overstrength factor Ωo according to ASCE 7-16?
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Structural system selection, Response modification coefficient R, Deflection amplification factor Cd and Overstrength factor Ωo are defined by the user.
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Using the ASCE 7-16 Wizard, instructions are made by the user.
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Design coefficients and factors selected by the user in the analysis settings wizard are checked automatically, and the results are reported.
SYMBOLS
Cd = Deflection amplification factor
Ωo = Overstrength factor
R = Response modification coefficient
For reinforced concrete and steel structural systems, design coefficients and factors are defined in Table 12.2-1.
Reinforced concrete and steel structural systems are divided into three classes, as given in Table 12.2-1: structural systems with special ductility level, intermediate and ordinary.
ASCE 7-16 Wizard facilitates the selection of the design coefficients and factors by making the necessary directions according to the selected ductility level.
|
Structural System Type |
Response Modification Coefficient, R |
Overstrengh Factor, Ωo |
Deflection Amplification Factor, Cd |
Structural System Limitations Including Structural Height, hn (ft) Limits |
||||
|---|---|---|---|---|---|---|---|---|
|
Seismic Design Category |
||||||||
|
B |
C |
D |
E |
F |
||||
|
A. Bearing Wall Systems |
||||||||
|
A1 - Special reinforced concrete shear walls |
5 |
21/2 |
5 |
NL |
NL |
160 |
160 |
100 |
|
A2 - Ordinary reinforced concrete shear walls |
4 |
21/2 |
4 |
NL |
NL |
NP |
NP |
NP |
|
A3 - Detailed plain concrete shear walls |
2 |
21/2 |
2 |
NL |
NP |
NP |
NP |
NP |
|
A4 - Ordinary plain concrete shear walls |
11/2 |
21/2 |
11/2 |
NL |
NP |
NP |
NP |
NP |
|
B. Building Frame Systems |
||||||||
|
B1 - Steel eccentrically braced frames |
8 |
2 |
4 |
NL |
NL |
160 |
160 |
100 |
|
B2 - Steel special concentrically braced frames |
6 |
2 |
5 |
NL |
NL |
160 |
160 |
100 |
|
B3 - Steel ordinary concentrically braced frames |
31/4 |
2 |
31/4 |
NL |
NL |
35 |
35 |
NP |
|
B4 - Special reinforced concrete shear walls |
6 |
21/2 |
5 |
NL |
NL |
160 |
160 |
100 |
|
B5 - Ordinary reinforced concrete shear walls |
5 |
21/2 |
41/2 |
NL |
NL |
NP |
NP |
NP |
|
B6 - Detailed plain concrete shear walls |
2 |
21/2 |
2 |
NL |
NP |
NP |
NP |
NP |
|
B7 - Ordinary plain concrete shear walls |
11/2 |
21/2 |
11/2 |
NL |
NP |
NP |
NP |
NP |
|
C. Moment-Resisting Frame Systems |
||||||||
|
C1 - Steel special moment frames |
8 |
3 |
51/2 |
NL |
NL |
NL |
NL |
NL |
|
C2 - Steel special truss moment frames |
7 |
3 |
51/2 |
NL |
NL |
160 |
100 |
NP |
|
C3 - Steel intermediate moment frames |
41/2 |
3 |
4 |
NL |
NL |
35 |
NP |
NP |
|
C4 - Steel ordinary moment frames |
31/2 |
3 |
3 |
NL |
NL |
NP |
NP |
NP |
|
C5 - Special reinforced concrete moment frames |
8 |
3 |
51/2 |
NL |
NL |
NL |
NL |
NL |
|
C6 - Intermediate reinforced concrete moment frames |
5 |
3 |
41/2 |
NL |
NL |
NP |
NP |
NP |
|
C7 - Ordinary reinforced concrete moment frames |
3 |
3 |
21/2 |
NL |
NP |
NP |
NP |
NP |
|
D. Dual Systems with Special Moment Frames Capable of Resisting at Least 25% of Prescribed Seismic Foces |
||||||||
|
D1 - Steel eccentrically braced frames |
8 |
21/2 |
4 |
NL |
NL |
NL |
NL |
NL |
|
D2 - Steel special concentrically braced frames |
7 |
21/2 |
51/2 |
NL |
NL |
NL |
NL |
NL |
|
D3 - Special reinforced concrete shear walls |
7 |
21/2 |
51/2 |
NL |
NL |
NL |
NL |
NL |
|
D4 - Ordinary reinforced concrete shear walls |
6 |
21/2 |
5 |
NL |
NL |
NP |
NP |
NP |
|
E. Dual Systems with Intermediate Moment Frames Capable of Resisting at Least 25% of Prescribed Seismic Foces |
||||||||
|
E1 - Steel special concentrically braced frames |
6 |
21/2 |
5 |
NL |
NL |
35 |
NP |
NP |
|
E2 - Special reinforced concrete shear walls |
61/2 |
21/2 |
5 |
NL |
NL |
160 |
100 |
100 |
|
E8 - Ordinary reinforced concrete shear walls |
51/2 |
21/2 |
41/2 |
NL |
NL |
NP |
NP |
NP |
|
F. Shear Wall-Frame Interactive System with Ordinary Reinforced Concrete Moment Frames And Ordinary Reinforced Concrete Shear Walls |
||||||||
|
F1 - Shear wall-frame interactive system |
41/2 |
21/2 |
4 |
NL |
NP |
NP |
NP |
NP |
|
G. Cantilevered Column Systems Detailed to Conform to the Requirement for |
||||||||
|
G1 - Steel special cantilever column systems |
21/2 |
11/4 |
21/2 |
35 |
35 |
35 |
35 |
35 |
|
G2 - Steel ordinary cantilever column systems |
11/4 |
11/4 |
11/4 |
35 |
35 |
NP |
NP |
NP |
|
G3 - Special reinforced concrete moment frames |
21/2 |
11/4 |
21/2 |
35 |
35 |
35 |
35 |
35 |
|
G4 - Intermediate reinforced concrete moment frames |
11/2 |
11/4 |
11/2 |
35 |
35 |
NP |
NP |
NP |
|
G5 - Ordinary reinforced concrete moment frames |
1 |
11/4 |
1 |
35 |
NP |
NP |
NP |
NP |
|
H. Steel Systems not Specifically Detailed for Seismic Resistance, Excluding Cantilever Column Systems |
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|
H - Steel Systems not Specifically Detailed for Seismic Resistance |
3 |
3 |
3 |
NL |
NL |
NP |
NP |
NP |