Study of Interaction between a PreWEC System and Surrounding Structure

A large-scale structural assemblage was tested to investigate the interaction between "Precast Wall with End Columns" (PreWEC) and surrounding structure. The PreWEC consisted of a precast rocking wall, steel end columns, and energy-dissipating elements termed "O-connectors". The cast-in-place surrounding structure included gravity columns and an unbonded post-tensioned floor with rigid wall-floor connections. Test results showed that damage to the wall and the grout beneath the wall was minor through 5% drift. Although local damage occurred to the floor at 4% drift, it did not affect the structural integrity of the floor. The resistance provided by the surrounding structure greatly increased the strength of the PreWEC, resulting in a high base shear demand on the wall. Although the inelastic action developed in the surrounding structure, which in turn increased the energy dissipating capacity of the test assemblage, the PreWEC system is expected to self-center when subjected to seismic loads.