Experimental Study on Response and Failure of Short Reinforced Concrete Beams under Impact Load by Drop Hammer

Experimental Study on Response and Failure of Short Reinforced Concrete Beams under Impact Load by Drop Hammer

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Yu-xiang DU^a^,^b^,^c, Yong-sheng JIA^a^,^b^,^c, Jin-shan SUN^a^,^b^,^c^,^d, Ying-kang YAO^a^,^b^,^c, Quan-min XIE^a^,^b^,^c, Yuan-yuan WANG^a^,^b^,^c, Sen-lin NIE^a^,^b^,^c

Blasting | 2023, 40(4) : 115 - 123

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Blasting | 2023, 40(4): 115-123

• EXPLOSIVE DEMOLITION •

Experimental Study on Response and Failure of Short Reinforced Concrete Beams under Impact Load by Drop Hammer

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Yu-xiang DU^a^,^b^,^c, Yong-sheng JIA^a^,^b^,^c, Jin-shan SUN^a^,^b^,^c^,^d, Ying-kang YAO^a^,^b^,^c, Quan-min XIE^a^,^b^,^c, Yuan-yuan WANG^a^,^b^,^c, Sen-lin NIE^a^,^b^,^c

Affiliations

^a.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China

^b.Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China

^c.Hubei (Wuhan) Institute of Explosion Science and Blasting Technology, Jianghan University, Wuhan 430056, China

^d.School of Digital Construction and Blasting Engineering, Jianghan University, Wuhan 430056, China

Published: 2023-12-01 doi: 10.3963/j.issn.1001-487X.2023.04.016

Outline

Abstract

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Reinforced concrete (RC) short beam is the key load-bearing component of buildings. In order to study its dynamic response and failure mechanism under impact load, drop hammer impact tests with different impact mass, impact velocity and impact energy were carried out by combining strain gauge sensor, high-speed photography and digital image technology (DIC). The results show that, the failure forms of the short RC beams under impact loads are arch collapse cracks and overall bending deformation, which are obviously different from those of shallow beams. The axial strain in the mid span of a short RC beam changes from tensile strain to compressive strain. With the increase of impact energy (18 061 J≤E≤49 831 J), the axial peak tensile strain and residual compressive strain in the mid span increase first and then decrease. The short RC beam is in the stage of elastic flexural deformation, elastic-plastic flexural deformation and punching shear failure mode in turn. The crack initiation and propagation process of the short RC beam under impact load is not unidirectional. And the fracture zone is formed by the multidirectional fracture propagation with multiple times, and then the plastic hinge is formed, resulting in the overall short beam failure. The deformation degree of the beam mainly depends on the impact speed rather than the impact energy. Specifically, the peak deflection and residual deflection in the middle span of the beam (26.81 mm≤w_p≤29.85 mm; 17.12 mm≤w_r≤21.66 mm) increase with the increase of the impact speed (5.53 m/s≤v≤7.13 m/s) under the same impact energy (30 000 J).

Key words

short RC beam / drop hammer impact test / impact energy / dynamic response / failure mechanism

Cite this Article

Yu-xiang DU, Yong-sheng JIA, Jin-shan SUN, Ying-kang YAO, Quan-min XIE, Yuan-yuan WANG, Sen-lin NIE. Experimental Study on Response and Failure of Short Reinforced Concrete Beams under Impact Load by Drop Hammer[J]. Blasting, 2023 , 40 (4) : 115 -123 . DOI: 10.3963/j.issn.1001-487X.2023.04.016

Funding

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Natural Science Foundation of Hubei Province(2022CFB874; 2020CFA043; 2021CFB541)
Key Research and Development Project of Hubei Province(2020BCA084)
Scientific Research Project of Hubei Education Department(B2022282)
National Natural Science Foundation of China(52209131)
Wuhan Knowledge Innovation Special Project(2023020201020444)

Appendix

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Year 2023 volume 40 Issue 4

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Article Info

doi: 10.3963/j.issn.1001-487X.2023.04.016

Receive Date：2022-12-12
Online Date：2026-03-19
Published：2023-12-01

Article Data

Affiliations

History

Received：2022-12-12

Funding

Natural Science Foundation of Hubei Province(2022CFB874; 2020CFA043; 2021CFB541)

Key Research and Development Project of Hubei Province(2020BCA084)

Scientific Research Project of Hubei Education Department(B2022282)

National Natural Science Foundation of China(52209131)

Wuhan Knowledge Innovation Special Project(2023020201020444)

Affiliations

^a.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China

^b.Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China

^c.Hubei (Wuhan) Institute of Explosion Science and Blasting Technology, Jianghan University, Wuhan 430056, China

^d.School of Digital Construction and Blasting Engineering, Jianghan University, Wuhan 430056, China

Corresponding:

JIA Yong-sheng (1970-), male, professor, Ph. D, mainly engaged in research and practice of engineering blasting, (E-mail) jason03566@163.com.

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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