DEFINITION OF VULNERABILITY ‘OF THE BUILDING BEFORE THE EARTHQUAKE
The primary objective was to be able to understand how to properly simulate the behavior of the deck coverage because it appeared infinitely deformable along the orthogonal direction to the arcs.
In order to properly analyze the real behavior of the structure, the building was initially shaped with two types of flat roof simulating its limit behavior. A first modeling was developed with a flat cover having an equivalent weight to the real one and infinite stiffness. A second model was built with an infinitely deformable flat roof. At this last model the tie rods were then added – at the same pace as the real ones – to simulate their action.
Once defined the representative models of the “range” to search for results in, we proceeded with the drafting of an additional model showing the actual geometry of the building reproducing the strings, chains and the walls with the greatest possible precision.
ANALYSIS ON MODELS WITH ASSEMBLY OF FLAT WALLS
The analyses conducted on models with flat roof well simulated the behavior of resistant walls but were not able to provide the actual behavior out of the tier of head walls.
The pushover analysis of the model with rigid floor gave back a good response of the building. But it was not the case for the model with infinitely deformable floor and studs. The range of response was too wide to allow an accurate assessment.
The study was also to combine the results of pushover analysis with those coming from verification of the mechanisms outside the tier of the walls in the two models with a flat roof. The checking holes from the tier of both models converge towards a definite number (58-60%), exclusively due to verification methodology. These results, however, could not find the right place in the wider response spectrum offered by the pushover analysis.
To be continued…