Effect of concrete mixture on shear behavior of prestressed concrete girders. (1st May 2023)

• Record Type: Journal Article
• Authors: Ou, Yu-Chen; Prasetya, Dwi; Zhang, Gen-Wei; Saputra, Mahendra Denny
• Is Part Of: Engineering structures. Volume 282(2023)
• Publication Date: 2023-05-01
• Subjects: Prestressed concrete -- Girder -- Shear strength -- Coarse aggregate amount -- High-performance concrete -- Self-consolidating concrete; CC conventional concrete -- HPC high-performance concrete -- HSC high-strength concrete -- HWC high-workability concrete -- NSC normal-strength concrete -- PC prestressed concrete -- RC reinforced concrete -- SCC self-consolidating concrete; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2023.115804
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Shear testing of prestressed concrete girders with various concrete types. Conventional concrete, high-performance concrete, and self-consolidating concrete. A shear test database of prestressed concrete girders. Relationship between coarse aggregate amount and shear strength of prestressed concrete girders. Abstract: A total of six shear-critical prestressed concrete (PC) I-girder were tested to investigate the effect of concrete mixture types on the shear behavior of PC girders. The concrete mixtures examined were conventional concrete (CC), high-performance concrete (HPC), and self-consolidating concrete (SCC) with normal (specified f c ′ = 41.4 MPa) and high (specified f c ′ = 68.9 MPa) compressive strengths. Test results showed that the HPC girders exhibited a shear behavior similar to the CC girders, irrespective of the concrete compressive strength. The SCC girder with normal-strength concrete (SCC-N) showed a higher ultimate shear strength ratio ( V ult / V n ) and higher ultimate displacement than the corresponding CC girder (CC-N). The SCC-N mixture was designed with a similar coarse aggregate amount but a reduced maximum coarse aggregate size compared with the CC-N mixture. The better performance of SCC-N may be attributed to a better filling ability of the SCC-N mixture than the CC-N mixture. The SCC girder with high-strength concrete showed a lower V ult / V n than the corresponding CC girder (CC-H). The lower shear strength of the SCC girder may be attributed to the lower coarse aggregate amount (19% lower) than the CC-H girder. A shear test database of PC girders was established to investigate further the effect of coarse aggregate amount on the girder shear strength. Based on the statistical analysis, the V ult / V n and coarse aggregate amount either showed a positive or insignificant correlation. For those groups of test data that showed positive correlation, the slopes of the linear regression of the test data showed that for a 100 kg/m 3 decrease of coarse aggregate amount, the V ult / V n decreased in average by 18.5%.