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Is it possible to perform a seismic analysis with the masonry material model?

Answer

The RF- / DYNAM Pro - Equivalent Loads add-on module only contains a linear analysis of structures. If you now apply a nonlinear model for the calculation, RF- / DYNAM Pro - Equivalent Loads will modify it internally and treat it as a linear model. The nonlinearity in your model is the masonry, which can not absorb tensile forces.

The problem is that: RF- / DYNAM Pro - Equivalent Loads linearly calculates the equivalent loads and exports the load cases from them. However, the load cases are subsequently calculated nonlinearly on the basis of the material model, which is not entirely correct. In addition, the results are superimposed according to the SRSS or CQC method, which results in tensile and compressive forces being present in the model.

In this case, you could, for example, change the masonry to isotropic linear and work with linear properties of the material model. In addition, you could introduce line hinges at this location, which you can use to avoid moment restraint, for example.

Keywords

Masonry Seismicity Equivalent Load

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