WP3 aims to:
- validate a nonlinear model of a bare or infilled r.c. structure through the numerical simulation of the experimental shaking-table tests performed in WP2
- quantify the effects of the building’s features and nonlinearity on the FS definition through parametric analyses
- quantify the effects of input characteristics on the FS definition
- definition of a hybrid (experimental plus numerical) dataset for the assessment of the effectiveness of current code and literature proposals for the evaluation of FS for r.c. buildings
Task 3.1 – Set-up and calibration of numerical models of the r.c. prototype
In this Task, a numerical model of the experimental r.c. prototype will be setup, using as the initial target the modal properties derived from dynamic identification performed before the shaking-table tests. Moreover, the numerical model will be validated through the simulation of the experimental campaign through incremental nonlinear dynamic analyses. The comparison of the results at global (e.g., response history in terms of top displacement, period elongation) and local scales (e.g. in terms of hysteretic force-displacement curves, damage pattern, accelerations on sensors, and floor spectra) will allow the model validation in the linear and nonlinear range.
Task 3.2 – Numerical parametric analyses
Starting from the numerical model calibrated in the previous Task, a set of configurations will be defined by varying the prototype layout (e.g. number of floors, distribution of infills) and features (e.g. considering different design levels – gravity loads only or gravity + seismic loads at different design seismic intensity levels) to investigate the effects of the building characteristics on the FS definition.
Then, for each configuration, nonlinear dynamic analyses will be performed applying the selected ground motions of increasing intensities. The comparison of the results in terms of FS will allow quantifying the effects of building characteristics and structural nonlinearity on them. Moreover, the use for the experimental tests of a selection of seismic input of different characteristics (in terms of frequency contents, duration, and intensities) will allow investigationof these effects as well.Finally, the assessment of the analytical tools at present available for the floor spectra definition will be provided using as input the data from the calibrated models and the experimental tests.