EXPERIMENTAL TEST ON ASEISMIC BEHAVIOR OF DAMAGED REINFORCED CONCRETE SHEAR WALL REPAIRED WITH ECC

The aseismic behavior of damaged reinforced concrete (RC) shear wall repaired with the engineered cementitious composite (ECC) was studied by a pseudo-static test. The shear wall was tested by an initial pseudo-static test to severe damage in a shear mode with crushing of concrete, yielding and fracture of a steel bar, then repaired with ECC and retested. The response of the RC shear wall in the twice pseudo-static tests was compared to evaluate the followings, such as the efficiency of repairing a damaged RC shear wall with ECC in term of a failure mode, the bearing capacity, the displacement ductility, the energy dissipation, the stiffness degradation and the utilization of a steel bar. The test results indicate that: a. the bearing capacity of a shear wall is restored; b. on the premise of assuring bearing capacity, the ductility of a shear wall is improved, and the failure mode is changed from brittle failure into ductile failure; c. the energy dissipation capacity is also enhanced; d. rely on the good coordination between ECC and a steel bar, the crushing of concrete and buckling of a steel bar is avoided, and the utilization of a steel bar is improved.