In Abaqus I have set up a model of Steel moment frames with welded flange plate (WFP) connection ( part of 10-storey building )for determination of fragility curves.
How can I apply earthquacke load and Building weight at the model?
You can activate the the gravity load in the load module.
For earthquake loading, you can use the amplitude option in both the concentrated or line force load based on what you seek.
Ali Mirzaee Hamed Sadaghian
Instead of using force load, use displacement under the foundation. It's better for convergence issues.
1) You will define two steps in the Abaqus analysis. In the first step only the gravity load is applied. In the second step the earthquake load is applied.
2) Depending on material and/or geometric nonlinearities that may be present in the model, you may specify the parameter NLGEOM in the *STEP option (i.e. geometrically nonlinear analysis)
3) The earthquake load can be applied either as imposed force at the storeys, or as imposed displacement at the base (foundation) of the building. In the former case, please use the *BASELINE CORRECTION option immediately after the *AMPLITUDE option, in which the amplitude of the imposed force is defined. This will avoid errors in the numerical integration of the differential equation of motion of the building during the dynamic analysis.
4) Take care of any diaphragm behavior of the floors of the building. You may specify additional constraints which (a) restrain the vertical motion of the joints between beams and columns, (b) restrain the relative motion between two adjacent joints (i.e. two joints that correspond to the ends of a beam of the building). Use *MPC or *TIE for this purpose.
5) To ensure the planar response of the building (in case of plane frame) you may need to restrain the displacements at the DOFs that are vertical to the plane of the building.
6) You may need to define additional mass elements at the joints of the building, using the *ELEMENT, TYPE=MASS option, to account for the mass of the plates of the floors (usually not explicitly modeled in a 2D frame building), both for gravity and for earthquake response purposes.
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