Abstract
This is the report of the tests on reinforced concrete columns subject to eccentric load. Various eccentric load tests were made to obtain a comporison between the ultimate strength and phenomenon of failure of reinforced concrete columns containing two lightweight aggregates and same columns containing sand and gravel aggregates. About concrete, two lightweight coarse aggregates, Asama and Oshima pumice, were selected to representative tyqes in Kanto area, another coarse aggregate and all fine aggregate were river sand and gravel. The ratio of reinforcement was 1.18 and 2.52% of one side, and eccentricity of load was 0.2, 0.5 and 1.0. The columns were made with the object of the same compressive strength of concrete, but they were tested in 139〜162kg/cm^2 of cylinder tests. As a result of this tests, the ultimate strength of reinforced lightweignt concrete columns deteriorated inconsiderably when the same strength of materials and same ratio of reinforcement was used compared with the reinforced normal concrete, columns but their safety factors were kept sufficiently so far as following to ordinary design method by Young's modulus ratio larger than the case of reinforced mormal concrete.
