The objective of this research was to investigate the behavior of interlocking lightweight
infilled masonry wall in reinforced concrete frame under cyclic loading. In this study, a prototype
frame was chosen from a three-story reinforced concrete building that was not designed for seismic
load. The evaluation of three samples .ie., the reinforced concrete bare frame (BF), the frame with
interlocking lightweight infilled masonry wall which block made from diatomite (W1) and the frame
with interlocking lightweight infilled masonry wall which block made from bagasse ash (W2). The evaluation of masonry infilled frame under cyclic loading of three types are diagonal compression
resistance, sliding shear resistance and upper corner compression resistance. It was found that, the
masonry infilled by interlocking lightweight cement block exhibited the higher seismic capacity than
the reinforced concrete bare frame. An analytical model was under cyclic loading by the use of
program, RUAUMOKO. The result revealed that, the evaluation of masonry infilled frame under
cyclic loading of three types was failure for diagonal compression resistance and comparison of the
samples of reinforced concrete frame W1 and W2 enhaned the seismic capacity similar on the
evaluation for diagonal compression resistance.