SEISMIC ASSESSMENT OF THE FULL SCALE FOUR STOREY E-DEFENSE ROCKING SHEAR WALL SHAKE TABLE TEST

Abstract eng:
An assessment of a four storey prestressed reinforced concrete structure is compared to existing results for a full scale shake table test. The E-Defense structure, which was tested in 2010 and was subjected to the Kobe earthquake record, is a complex concrete structure with prestressed rocking shear walls in one direction and a moment frame in the other. This work focusses on the seismic performance assessment of the rocking shear wall system subjected to the 1990 Kobe earthquake record at three intensity levels (25%, 50% and 100%), as was done in the shake table test. The purpose of this study is to assess if, rather than using heuristic approaches or experimental data to calibrate the nonlinear elements of a lumped plasticity model, a more advanced static nonlinear finite element procedure that can accurately capture the complexity of these elements could be used to calibrate the hysteresis of the plastic elements. In this study, the hysteretic response of the critical members, namely the rocking shear wall and the columns, were obtained through modelling in VecTor2, a two dimensional nonlinear finite element tool for reinforced and prestressed concrete structures. These hysteresis were then used to calibrate a nonlinear spring at the base of the shear wall in Ruaumoko and a full nonlinear time history analysis was conducted. The peak base shear and drift ratio at the peak were predicted well. Furthermore, the individual member responses, modeled in VecTor2, accurately captured the crack patterns and failure modes observed in the experiment. To mimic situations practitioners would encounter, the results were not adjusted after the analysis was conducted, the predictions were conducted in a blind prediction process.

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