Seismic Analysis in LimitState:GEO
The LimitState:GEO seismic analysis functionality allows a pseudo static analysis to be undertaken on any problem geometry.
The flexible modelling capability of LimitState:GEO allows complex problems such as quay wall collapse to be straightforwardly modelled as illustrated.
Pseudo Static Analysis
The pseudo static analysis may be formulated as:
- an additional fixed horizontal and/or vertical acceleration within the problem, or
- such that LimitState:GEO returns the value of the acceleration required to trigger instability.
The figure to the right illustrates the result of applying the latter procedure in determining the horizontal acceleration required to reach a specific active earth pressure on a retaining wall.
The LimitState:GEO result of 0.097g is slightly lower than the result of 0.100g determined using the Mononobe-Okabe equation. The latter is expected to be higher as it is based on a single wedge analysis only. More details are available in the LimitState:GEO manual.
Further information on the seismic modelling capabilities of LimitState:GEO may be found by clicking on one of the following links:
- Manual section on worked examples of modelling with seismic loads
- Explanation of how LimitState:GEO models seismic loads
- How to handle seismic loads within the user interface