Study on Size Effect of Bending-Shear Performance of High-Strength Reinforced Concrete Short Columns

XIE Yongping; YU Chunyi; ZHAO Lijie; WANG Hao; GUO Jianming

doi:10.3724/j.gyjzG24022906

Volume 55 Issue 5

May 2025

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XIE Yongping, YU Chunyi, ZHAO Lijie, WANG Hao, GUO Jianming. Study on Size Effect of Bending-Shear Performance of High-Strength Reinforced Concrete Short Columns[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(5): 123-131. doi: 10.3724/j.gyjzG24022906

Citation:

XIE Yongping, YU Chunyi, ZHAO Lijie, WANG Hao, GUO Jianming. Study on Size Effect of Bending-Shear Performance of High-Strength Reinforced Concrete Short Columns[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(5): 123-131. doi: 10.3724/j.gyjzG24022906

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Study on Size Effect of Bending-Shear Performance of High-Strength Reinforced Concrete Short Columns

doi: 10.3724/j.gyjzG24022906

1. College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300392, China;
2. College of Exploration Technology and Engineering, Hebei GEO University, Shijiazhuang 050031, China;
3. China Construction Science & Technology Co., Ltd., Beijing 100070, China;
4. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;
5. Hebei Jike Engineering Project Management Co., Ltd., Shijiazhuang 050021, China

Received Date: 2024-02-29
Available Online: 2025-07-15

Abstract

Abstract

In order to study the size effect of bending-shear performance of high-strength reinforced concrete short columns， based on the principles of geometric similarity and bearing capacity similarity， reinforced concrete short column specimens with cross-sectional side lengths of 300， 500， and 700 mm and concrete strength grade C60 were designed and fabricated. Low cycle repeated quasi-static tests were conducted on the specimens， and the failure modes， skeleton curves， and steel rebar strain of the specimens were discussed. Furthermore， the variation laws of shear performance with cross-sectional size， such as nominal bending stress， nominal rotation angle， P-Δ effect， ductility， energy dissipation capacity， and safety reserve factor， were analyzed. The test results indicated that all specimens had bending-shear failure. Before reaching the peak load， the cracks developed stably， which conformed to Bažant’s Type2 size effect model. The specimen had good ductility and energy dissipation capacity， with a ductility coefficient of 3-5 and a minimum ductility coefficient of 3.65. The nominal bending stress， nominal angle， P-Δ effect， ductility， and energy dissipation capacity exhibited significant size effects. The cross-sectional size increased from 300 mm to 700 mm， the peak nominal stress decreased by 16.7%， the safety reserve coefficient decreased by 11%， the specimen ductility decreased by 36.4%， and the average energy dissipation coefficient decreased by 54.3%. On the basis of tests， the theoretical formula for the bending bearing capacity of normal sections in GB/T 50010—2010 was modified based on the Type2 size effect model. The modified safety reserve coefficient no longer has size effects， ensuring that large-sized specimens have the same safety as small-sized specimens.
- high-strength reinforced concrete,
- reinforced concrete short column,
- bending-shear performance,
- size effect

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References(39)

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