[논문]High-strength concrete columns confined by low-volumetric-ratio lateral ties

Hong, Ki-Nam; Han, Sang-Hoon; Yi, Seong-Tae

doi:10.1016/j.engstruct.2006.01.010

High-strength concrete columns confined by low-volumetric-ratio lateral ties

Engineering structures, v.28 no.9, 2006년, pp.1346 - 1353

Hong, Ki-Nam (Department of Civil Engineering, Chungbuk National University, San 12, Gaesin-dong, Cheongju-si, Chungbuk-do, 361-763, South Korea) , Han, Sang-Hoon (Department of Civil Engineering, Chungbuk National University, San 12, Gaesin-dong, Cheongju-si, Chungbuk-do, 361-763, South Korea) , Yi, Seong-Tae (Department of Civil Engineering, Chung Cheong University, 330, Wolgok-ri, Kangnae-myun, Cheongwon-kun, Chungbuk-do, 363-792, South Korea)

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AbstractPresently, test results and stress–strain models for poorly confined high-strength concrete (HSC) columns are in short supply. This is particularly so for columns with a tie volumetric ratio smaller than 2.0%. This paper presents concentric loading test results for square reinforced concrete columns confined by low-volumetric-ratio lateral ties. The test variables included measurements of concrete compressive strength; measurements of tie yield strength; and the tie volumetric ratio. The results showed that high-strength columns under axial compression exhibit less lateral expansion than normal-strength columns do. Further testing confirmed that a bowing of lateral ties in high-strength concrete specimens cannot be observed. Lateral ties of columns consisting of high-strength concrete and higher-grade lateral ties did not yield; additionally, increasing the tie yield strength did not significantly improve the confinement effect. A final finding was that, in columns having nearly the same ρs⋅fsy value, specimens with higher volumetric ratios of a lower-grade tie yield strength performed better than those with lower volumetric ratios of a higher-grade yield strength.

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참고문헌 (14)

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High-strength concrete columns confined by low-volumetric-ratio lateral ties

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