Limitations of Non-Linear Static Analysis
There are many unsolved issues that need to be
addressed through more research and development. Examples of the important
issues that need to be investigated are:
Incorporation of torsional effects (due to
mass, stiffness and strength irregularities).
3-D problems (orthogonality effects, direction
of loading, semi-rigid diaphragms, etc)
Use of site specific spectra.
Cumulative damage issues.
Most importantly, the consideration of higher
mode effects once a local mechanism has formed.
Since the pushover analysis is approximate in nature and is based on static
loading, as such it cannot represent dynamic phenomena with a large degree of
accuracy. It may not detect some important deformation modes that occur in a
structure subjected to severe earthquakes, and it may significantly from
predictions based on invariant or adaptive static load patterns, particularly
if higher mode effects become important.
Conclusion & References