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| Investigation of dynamic compression performance of high-strength concrete under near-field impact based on high-speed DIC |
| HU Liangpeng1，SUN Yangyang2，YUE Songlin2，MA Linjian2，CHEN Xudong1，NING Yingjie3，SONG Xiaohai4 |
1.College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China;
2.National Defense Engineering College, Army Engineering University of PLA, Nanjing 210007, China;
3.Zhejiang Communications Construction Group Co., Ltd., Hangzhou 310052, China;
4.Southwest Branch of China National Nuclear Industry Huaxing Construction Co., Ltd., Chongqing 401122, China |
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Abstract In order to gain insight into the damage characteristics and high strain rate mechanical response of high-strength concrete materials in assembled precast bridge structures under near-field impact loading, uniaxial impact compression tests were conducted on C60 and C80 high-strength concrete using a 100 mm large-diameter split Hopkinson pressure bar (SHPB). Dynamic parameters such as stress-strain curves, dynamic modulus of elasticity and dynamic increase factor of the concrete were obtained. The high-speed digital image correlation (DIC) technology was used to study the strain field on the concrete surface and analyze the crack propagation process during the failure process. The test results show that: the dynamic compressive strength of high-strength concrete specimens under high strain rate shows obvious strain rate effect, but its modulus of elasticity remains constant. And the logarithmic function model can better characterize the dynamic strength evolution pattern of high-strength concrete under high strain rate. Macroscopically, the observed damage patterns can be classified into four modes: intact specimen, axial splitting, concrete bursting and crushing. At high strain rates, the instability of crack and its expansion rate increases with strain rate increasing.
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Received: 18 July 2022
Published: 28 June 2023
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