Experimental Study on Flexural Behaviour of Prestressed Specified Density Concrete Composite Beams

Xingyu Song, Yan Liu (), Xiaodong Fu, Hongwei Ma and Xiaolun Hu
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Xingyu Song: College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China
Yan Liu: College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China
Xiaodong Fu: International Century Design of Architecture, Changzhou 213000, China
Hongwei Ma: College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China
Xiaolun Hu: School of Transportation, Southeast University, Nanjing 211189, China

Sustainability, 2022, vol. 14, issue 22, 1-14

Abstract: To solve the problem of poor seismic resistance due to the disadvantages of traditional concrete composite beams, such as heavy self-weight in prefabricated buildings, prestressed specified-density concrete composite beams are proposed herein. First, a mix ratio test of specified-density concrete was performed. Second, five prestressed specified-density composite beams, a prestressed ordinary concrete composite beam, and a prestressed semi lightweight concrete cast-in-situ beam were tested. The influence of the precast concrete height, reinforcement ratio, and concrete materials on the failure mechanism, flexural bearing capacity, and short-term stiffness of the composite beams were analysed. From the results, the specified-density concrete composite beams and the ordinary composite beam had similar ultimate bearing capacities, but the average distance between crack spacings of the former was smaller. The precast concrete height affected the bending performance of the prestressed specified density concrete composite beam insignificantly, but the maximum ultimate bearing capacity of the composite beam could be increased by 35.6% by increasing the reinforcement ratio. The composite beam and the cast-in-place beam exhibited similar load-carrying capabilities and deformation properties. The average crack spacing, cracking load, and ultimate load value of the specified density concrete composite beams calculated according to the China national standard “Code for design of concrete structures” were consistent with the measured values.

Keywords: building industrialization; specified-density concrete; concrete composite beam; bending performance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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