Analysis of Substandard RC Buildings Strengthened With An Innovative Post-Tensioned Metal Strapping Technique

Abstract eng:
This paper investigates analytically the efficiency of an innovative Post-Tensioned Metal Strapping (PTMS) strengthening technique at improving the seismic behaviour of a reinforced concrete (RC) building. A full-scale two-floor building with substandard reinforcement detailing at the columns and beam-column joints was tested on a shake table as part of the EUfunded research project BANDIT. After the bare building was initially damaged significantly, it was repaired and strengthened with PTMS to perform additional seismic tests at various Peak Ground Acceleration (PGA) levels. The PTMS technique improved considerably the seismic performance of the tested building. Whilst the bare building experienced critical damage at an earthquake of PGA=0.15g, the PTMS-strengthened building sustained a PGA=0.35g earthquake without compromising stability. In this study, the experimental data from the initial shake table tests are used to calibrate analytical models through nonlinear time-history analyses. To simulate deficient beam-column joints, models of steelconcrete bond-slip and bond-strength degradation under cyclic loading are considered. The results show that the PTMS strengthening intervention significantly enhanced the seismic behaviour of the substandard beam-column joints, as well as the deformation capacity of the building. It is also shown that the analytical models of both bare and strengthened buildings provide a reasonable estimate of the maximum deformation demands for earthquake excitations with different PGA levels.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket