BIDIRECTIONAL PSEUDODYNAMIC TECHNIQUE FOR TESTING ATHREE-STOREY REINFORCED CONCRETE BUILDING

摘要

Within the project SPEAR, a full-size three-storey non-symmetric RC building has been seismically testedat the ELSA laboratory by means of the PsD method. Since the induced torsion was one of the majorconcerns about the response of this structure, the tests included bidirectional excitation and allowed forthree in-plane DoFs per floor: two displacements plus one rotation. The equation of motion is formulatedand integrated in generalised DoFs, which are those displacements and rotation defined at the CM of eachfloor. At every step of integration the experimental restoring forces are statically transformed intogeneralised forces and, once the new generalised displacements are computed, the target displacement forthe transducers on the structure are obtained by a cinematic transformation. The implemented PsDtechnique allows for the use of more than three actuators per floor in order improve the load distributionand avoid possible saturation of the actuators. The first series of test on the un-retrofitted structure wassuccessfully performed giving most profitable information about the seismic behaviour of such structure.