Civil Engineering Reference
In-Depth Information
6
Regular Frame
Irregular Frame
5
4
3
2
1
0
0.00
0.20
0.40
0.60
0.80
1.00
Normalized Lateral Displacements (
i
/
top
)
d Δ
6
5
Regular Frame
Irregular Frame
4
3
2
1
0.00
0.20
0.40
0.60
0.80
1.00
Normalized Storey Drifts (dd
i
/
max
)
Figure 2.20
Comparison between the distribution of deformations in regular and irregular frames under horizontal
loads: storey (
top
) and inter-storey (
bottom
) drifts
on the seismic response of RC buildings reported by Mwafy and Elnashai (2001) demonstrated that the
spread of inelasticity may lead to signifi cant decrease of the structural stiffness that in turn causes the
fundamental period of vibration to elongate considerably. The distribution of the inertia forces along
the building undergoes continuous changes as a result of stiffness and period variation. Static and
