The columns of older reinforced concrete (RC) buildings generally have limited reinforcement details. Thus, they could be vulnerable to earthquake ground motions, leading to partial or complete building collapse. In this study, high-performance fiber-reinforced cementitious composite (HPFRCC) was applied to RC columns to improve their seismic behavior. Experimental tests were conducted with two full-sized specimens with limited reinforcement details, including short lap splices, while unidirectional loadings were applied to the specimens. The seismic behavior of RC columns was substantially improved by using HPFRCC.

Response modification factors of school facilities for non-seismic RC moment frames with partial masonry infills in ‘Manual for Seismic Performance Evaluation and Retrofit of School Facilities’ published in 2018 were investigated in the preceding study. However, since previous studies are based on 2D frame analysis and limited analysis conditions, additional verification needs to be performed to further apply various conditions including orthogonal effect of seismic load. Therefore, this study is to select appropriate response modification factors of school facilities for non-seismic RC moment frames with partial masonry infills by 3D frame analysis. The results are as follows. An appropriate response modification factor for non-seismic RC moment frames with partial masonry infills is proposed as 2.5 for all cases if the period is longer than 0.6 seconds. Also if the period is less than 0.4 seconds and the ratio of shear-controlled columns is less than 30%, 2.5 is chosen too. However, if the period is less than 0.4 seconds and the ratio of shear-controlled columns is higher than 30%, the response modification factor shall be reduced to 2.0. If the period is between 0.4 and 0.6 seconds, then linearly interpolates the response correction factor.

This paper investigates seismic performance of a small-sized single story building in Korea. Nonlinear pushover anlaysis is performed to verify shear failure of　RC　short columns eventually led to performance degradation. Also, nonlinear time history analysis is performed using the same earthquakes from Gyeongju. Similar failure mode was obtained as in the report where a sudden rupture of the RC columns happened.

In this study, compressive tests were carried out on seamless circular tubular short columns with corrosion-damaged end, and investigated change in compressive strength of columns with local corrosion at the end. Local corrosion was artificially introduced by milling machine, and differed in corrosion depth (0, 1.5, 3, 4.5 mm), corrosion height (0, 20, 60, 120 mm), and corrosion circumference (0, 90, 180, 360˚ ). As a result, the compressive loads were linearly decreased with increasing of corrosion degrees, and a quantitative evaluation for residual compressive strength of seamless circular tubular short column with corrosion-damaged end was suggested by using corroded volume loss ratio.