Abstract

Building codes did not include requirements for spe cial seismic detailing of reinforced concrete structures until the 1970's whe n several earthquakes demonstrated the need for more ductile design. Thes e buildings are vulnerable to numerous failure modes including: failure of col umn lap splices; strong beam/weak column failures; captive column failure; punching shear failures in flat plate slabs; and shear and axial load failure of columns with wide transverse reinforcement spacing. A discontinuity i n stiffness and strength at the bottom story, due to a soft story, often result s in a concentration of earthquake damage at the building base. Several exa mples of past earthquake behavior are given in this report as well as discus sion of various retrofit options. Gravity load designed old school buildings had been heavily damaged by the October, 1992, Egypt earthquake in the regions near the epicenter. Most of the victims were school students because there was no previous knowledge of the ideal behavior dealing with earthquakes, the ca se that leads to the students' rushing into corridors and stairs. As a result of t he weakness of some parapets of corridors, some students fell into the playgroun d. Moreover, the existence of only one stair at most schools cause the accumulati on of students over the stair, which led to the death of some students. Samples of old school buildings in Egypt were selected for evaluation to determine the deficient aspects of these buildings. Finally, the research sheds the light on the best public behaviour against earthquakes. The aim of this study is to investigate the code-ba sed procedure of seismic performance assessments of existing buildings and t o determine the seismic performance levels of a case study reinforced concr ete building, which represents typical existing building stock in Egypt , as well as comparing the consequences of linear static analysis procedures.

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