Model dynamic blast loads on a building frame in RISA 3D
Model dynamic blast loads on a building frame in RISA 3D
(OP)
We are working on a project at a Petrochemical facility where we need to reinforce an existing building to resist the blast loads from an accidental explosion on site. a blast consultant performed a blast study of the facility and has provided us with a reinforcement concept, blast loading pressures, impulses and duration's for the walls and roof. I have performed the component designs with SBEDS, but the lateral frame system of the building needs to be checked by a FEM model.
Does anyone know how to apply or model blast loads in RISA 3D? Are there any tutorials or videos available for this? From a google search, I find references to using RISA for blast loads, but no help is actually applying it.
Thanks
Does anyone know how to apply or model blast loads in RISA 3D? Are there any tutorials or videos available for this? From a google search, I find references to using RISA for blast loads, but no help is actually applying it.
Thanks





RE: Model dynamic blast loads on a building frame in RISA 3D
My impression is that blast loading analysis is usually either a non-linear analysis (i.e. considering material yielding and hinging) or a time history analysis or possibly BOTH. If that's true then RISA is not the proper program to do this.
Of course, many of these complex non-linear analysis procedures will have a conservative linear analysis option as well. If you've seen references to RISA used for blast analysis then that is probably what they were doing. I do recall one user some years ago talking about his model as being a government building where he need to consider blast loading in the analysis. If I remember correctly, what he was doing was removing a critical column here or there in his structure and then running the analysis to make sure the adjacent frames were strong enough to take the re-distributed loads. The idea being that if any one load bearing element were destroyed that the building would still be strong enough to survive.