SEISMIC RESPONSE OF DETERIORATED RESIDENTIAL RC BUILDINGS IN THE NORTHEASTERN REGION OF THAILAND

Abstract

This paper presents effect of steel corrosion and concrete degradation on seismic response
of residential RC buildings in the Northeastern region of Thailand, originally designed without seismic
consideration. Two parts of the study are presented, including site investigation to gather information of
damages in 10 existing buildings, and nonlinear pushover analysis of deteriorated structure based on damage
scenario from the first part. Using procedure and parameters described in ASCE 41 and recent results of seismic
hazard assessment, the numerical results revealed that buildings of all material degradation conditions were
safe under the Basic Safety Earthquake (BSE). The evaluation of the structures under the Design Earthquake
(DE) indicated that the studied building with high deterioration could not withstand the design earthquake, as
the most loaded columns would fail in flexure rather than in shear associated with yielding in the beams of the
buildings. Ductility of buildings was found to be sensitive to the supposed material degradation.