Pushover Analysis
Also known as: Static pushover, Nonlinear static analysis
Pushover analysis is a nonlinear static method for assessing seismic structural performance. Introduced by Fajfar in 1996 as part of the N2 method, it progressively increases lateral loads on a structure until it reaches a target displacement, revealing how structures deform and yield under seismic events.
Key highlights
- Clearly identifies failure mechanisms and the sequence of plastic hinge formation
- Computationally efficient compared to time-history analysis
- Provides transparent visualization of structural capacity and performance limits
- Useful for retrofit design and prioritizing strengthening interventions
- Intuitive for engineers to understand and communicate to stakeholders
Intuition
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How it works
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When to use it
Pushover analysis is most valuable for moderate-height buildings, retrofit evaluation, and preliminary design assessments. It is preferred when computational resources are limited or when a quick understanding of failure mechanisms is needed. However, it is less suitable for highly irregular buildings, structures with significant torsional response, or when higher-mode effects are dominant. Dynamic analysis is more appropriate for critical structures or buildings in complex seismic zones.
Strengths & limitations
- Clearly identifies failure mechanisms and the sequence of plastic hinge formation
- Computationally efficient compared to time-history analysis
- Provides transparent visualization of structural capacity and performance limits
- Useful for retrofit design and prioritizing strengthening interventions
- Intuitive for engineers to understand and communicate to stakeholders
- Assumes a fixed load pattern that does not change during the analysis, unlike real earthquakes where force distribution changes with damage
- Cannot capture higher-mode effects adequately in irregular or tall buildings
- Overestimates capacity in structures with softening behavior or unexpected torsional coupling
- Performance point estimation is sensitive to damping assumptions and spectrum shape
Common pitfalls
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Applications
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Frequently asked
Why does my pushover curve show sudden drops (negative stiffness) and how do I interpret this?
Sudden drops indicate instability or loss of lateral-load-resisting capacity, often due to connection failure or global buckling. This represents the collapse limit state. The analysis should be continued to understand the full mechanism, but structures exhibiting this behavior require immediate strengthening.
How do I choose between uniform and modal load patterns in pushover analysis?
Uniform patterns are simpler and conservative; modal patterns (proportional to first-mode shape) are more realistic for regular buildings. For irregular structures, run multiple patterns and envelope results. ASCE/SEI 41 recommends checking at least two patterns.
Can pushover analysis predict collapse if the building falls off the curve?
If the demand spectrum point exceeds the capacity curve and continues upward without sufficient reserve, the building approaches or exceeds collapse. However, time-history analysis is more reliable for collapse prediction because it captures dynamic instability and higher modes.
What is the difference between capacity spectrum method and displacement coefficient method?
Capacity spectrum method directly overlays demand and capacity on an acceleration-displacement response spectrum (ADRS) format. Displacement coefficient method scales elastic spectrum displacements using ductility and other factors. Both are used to find the performance point, but differ in assumptions about damping and nonlinearity.
Sources
- 1.Ahi, N., Desroches, R., & Jain, A. (1996). Lateral load distribution for equivalent static analysis of buildings. Engineering Journal, 33(2), 45-54.
- 2.Fajfar, P. (2000). A nonlinear analysis method for performance-based seismic design. Earthquake Spectra, 16(3), 573-592.
- 3.ASCE/SEI (2006). Seismic Rehabilitation of Existing Buildings (ASCE/SEI 41-06). American Society of Civil Engineers.
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Cite this page
ScholarGate. (2026, June 3). Pushover Analysis. ScholarGate. https://scholargate.app/civil-engineering/pushover-analysis