Disaster mitigation is a significant issue
that must be addressed to avert the destructive impact of a disaster. Evaluation
of the seismic performance of the structures is important to minimize the
property damage and eliminate loss of lives against the hazardous effect of
natural phenomenon such as earthquakes due to strength deterioration especially
of the old buildings. The failure of structures disrupted the operation particularly
on the post-disaster functions of school buildings. The Japan Building Disaster
Prevention Association (JBDPA) Standard for seismic evaluation of existing
reinforced concrete buildings is a detailed inspection method where the actual
capacity of the structures to resist the seismic force can be determined.
Moreover, proper retrofitting can be carried out to the vulnerable and essential
structure to assure the safety of the building stakeholders. The JBDPA Standard
focuses on the reinforced concrete structures with the concrete wall. The strength
index of the masonry infill walls especially those with openings was determined
from the equations of various experts. The two target structures, namely:
Engineering Building 2 and four-story Administration Building are old and newly
constructed buildings, respectively. The strength of the infill wall was added
in the calculation of the seismic capacity of the school buildings. The
backbone curve of the frame with reinforced masonry infill wall presented an
informative result. The structures require retrofitting based on the first and
second level screening. The result of the second level screening specified that
only the first floor of the old and new buildings’ longitudinal axis need to be
strengthened. The behaviors of the structures before and after retrofitting were
analyzed in STERA 3D. Following
the concept of the JBDPA Standard was found useful in the Philippines since
many existing reinforced concrete school buildings with masonry infill wall
need further evaluation. Furthermore, the proposed usage index ranges from
1.25-2.00 should be considered to emphasize the importance of the school
buildings in post-disaster activities.
Keywords: Post-disaster functional asset value
index, JBDPA Standard, Masonry infill wall.