Ductility Capacity Of Specimens Research Articles

고막 패각을 잔골재로 사용한 전단보강근이 없는 철근콘크리트 보의 연성에 관한 연구

As a result of compressive strength, specimens having mixture rate of cockle shells of <TEX>$15\%\;and\;20\%$</TEX> showed more increases of compressive strength than non-mixture specimens as age increases. Ductility capacity of specimens was higher in specimens mixing cockle shells than in specimens using general fine aggregates and specimen of <TEX>$10\%$</TEX> of cockle shells was highest in ductility capacity. To sum up all experimental results, ductility capacity of specimen without shear reinforcement using mixture of cockle shell was higher than non-mixture specimen and it is considered that mixture of cockle shells up to <TEX>$20\%$</TEX> as fine aggregate for concrete will be available. Continuous researches on durability, workability and economy of crushed cockle shells used for substitute fine aggregate of concrete will be needed.

Tests of Welded Beam-Column Subassemblies. I: Global Behavior

This paper describes the results of cyclic loading tests applied to 14 full-scale beam-column subassemblages. First, efforts undertaken in the Japanese steel community in response to damage observed at welded beam-to-column connections in the 1995 Hyogoken-Nanbu (Kobe) Earthquake are introduced. Second, the major test parameters chosen in this study are described: type of steel, type of connection, type of weld access holes, type of weld tabs, and type of loading. Third, the test results are presented in terms of the ductility capacity of the test specimens. Major findings are as follows: (1) All specimens developed plastic rotations and cumulative plastic rotations of 0.03 rad and 0.3 rad, respectively, suggesting that ductility capacity of the specimens was sufficient in light of present Japanese seismic design; (2) dynamic loading had no detrimental effect on ductility capacity; (3) ductility capacity was significantly smaller for specimens with steel weld tabs than for those with flux tabs made of cer...