Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (1): 53-59.doi: 10.6040/j.issn.1672-3961.0.2020.403

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Experimental study on stiffness of reinforced concrete pre-cracked beams based on crack parameters

ZHOU Shuming1,2, YAN Donghuang1*   

  1. 1. College of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410114, Hunan, China;
    2. Hunan City University, Yiyang 413000, Hunan, China
  • Published:2021-03-01

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Abstract: To research the stiffness characteristics of simply-supported reinforced concrete bridges after cracking in the mid-span, mechanical tests of pre-cracked in the mid-span beams with different nominal damage ratios were carried out. The specimens were cast-in-situ reinforced concrete pre-cracking beams. In the specimens, three different lengths(a=8、18 and 26 mm)of cracks in the mid-span were considered respectively. The evolutions of stiffness reduction coefficient k with nominal damage ratio λ and crack opening w under load of the 8 m standard span reinforced concrete pre-cracked beams were studied through experiments. It was showed that under different test conditions, k decreased with the increase of λ and w. The pre-cracked specimensk decreased little when the crack length was less than the thickness of the protective layer of reinforcement, decreased rapidly when the crack length was near the height of reinforcement. However, the decreased speed appears to fall back when the crack length was higher than the height of the reinforcement. On this basis, a formula for calculating the stiffness reduction coefficient of simply-supported reinforced concrete bridges after cracking in the mid-span was proposed. The effort of this paper could provide a basic for the accurately predicting and evaluating the stiffness characteristics of simply-supported reinforced concrete bridges after cracking.

Key words: bridge engineering, reinforced concrete beam, the stiffness reduction coefficient, experimental study, crack parameter

CLC Number: 

  • U446.3
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