Abstract
Due to earthquake, buildings are damaged partially or completely. Particularly, structures with soft storey are mostly affected. In general, such damaged structures are repaired and reused. In this regard, an experimental investigation was planned and conducted on models of single bay, single storey of partial concrete infilled reinforced concrete (RC) frames up to collapse with corner, central, and diagonal steel bracings. Such collapsed frames were repaired with epoxy resin and retested. The initiative was to identify the behavior, extent of restored ultimate strength, and deflection of epoxy-retrofitted frames in comparison with the braced RC frames. The performance of such frames has been considered only for lateral loads. In comparison with bare RC frames, epoxy-repaired partial infilled frames have significant increase in lateral load capacity. Central bracing is more effective than corner and diagonal bracing. For the same load, epoxy-repaired frames have comparable deflection than similar braced frames.
Highlights
Nowadays, soft storeys are common at the parking level in multistoried buildings
The comparison of the ultimate load of reinforced concrete (RC) frames R5, R6, and R7 with epoxy-repaired frames R8, R9, and R10 as mentioned in Table 3 shows a decrease of 16.6%, 24.42%, and 11.7%, respectively in lateral load capacity
The purpose of this study was to evaluate the strength of epoxy-repaired RC frames in comparison with those studied by previous researchers, as well as to add to the database of strengthening test results in order to lead to changes or acceptance in design codes and standards
Summary
There is elimination of infill walls in bottom storey, whereas the storeys above are filled with partition or shear walls. Such frames have less capacity to bear lateral loads. Based on an analytical investigation, Arshad and Alok (2008) had studied seismic performance and potential seismic damage of masonry infilled reinforced concrete (RC) framed building with soft storey. It was observed that if the storey is partially infilled (in comparison with that with no infills), it decreases the storey drift and deformations in the column and reduces the related damage to the overall frame. Infilled RC frames were used as these were one of the best solutions to overcome the lateral strength problem for frames with soft storey. Many prototypes as well as models of reinforced cement concrete (RCC)
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