The option 5. in the RM Bridge Enterprise Training Examples is the Earthquake that has the datasets and a description document for the seismic analysis of a three span bridge using the response spectrum analysis with all necessary steps as listed below.
The following items are briefly described in the training document:
- Definition of masses of all permanent loads - i.e. self weight & superimposed dead load;
- Calculation of the eigenvalues, the low natural frequencies;
- Preparation of the response spectrum;
- Definition of the earthquake load;
- Evaluation of response spectrum for earthquake analysis;
- Superposition of the seismic loads;
- Result presentation.
Dynamic analysis can be achieved with the addition of some simple steps. It's important to notice that the number of necessary modes that contribute to a certain structure could be evaluated for each Global principal direction X, Y, and Z, by the Sum of the Mass Participation Factors listed in the results.