Full-Scale Static Loading Test on a Five Story Reinforced Concrete Building (Part2: Damage Analysis)

Abstract eng:
Damage analysis was conducted on the static loading test data of the full-scale five-story reinforced concrete building utilizing wing walls for damage reduction. In experiment, damage was measured quantitatively for one beam with spandrel walls, two columns with wing walls, and one floor slab by recording width and length of all cracks and concrete spalling area at each peak and unloaded condition. After loading test, damage of these members was classified using the Japanese guideline (Guideline for post-earthquake damage evaluation and rehabilitation) based on recorded quantities. This damage analysis shows the effectiveness of structural slits for walls because the residual crack widths of the beam was as small as 0.2 mm or smaller. However, the damage class of beam became severe since the beam had a few large residual cracks. On the other hand, damage of wing walls was severer than damage of column, and it became clear that their damage should be evaluated individually. Then, the post-earthquake damage evaluation for the whole building was performed and the damage level of the building was ”Moderate” or ”Heavy” at 1/200 rad and 1/100 rad drift, respectively, while the building still had not reached the peak load. This shows that the current guideline is not able to evaluate the damage level of the building appropriately. The criteria of building function continuity proposed by authors were verified by comparison with the obtained experimental data. The guidelines use the maximum residual crack width and the degree of concrete crushing to classify the damage level of members. However, overall damage states such as the number and length of cracks and area of spalling and crushing of concrete needs to be evaluated for a proper and precise damage evaluation.

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