Shear behavior of RC slender beams without stirrups by using precast U-shaped ECC permanent formwork

Zhang, Rui; Hu, Peng; Zheng, Xiaohang; Cai, Lianheng; Guo, Rui; Wei, Dingbang

doi:10.1016/j.conbuildmat.2020.120430

Cited by 36 publications

(17 citation statements)

References 13 publications

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“…The common shear strengthening methods include bonded fiberreinforced polymer (FRP) strips or mesh fabric, [10][11][12] bonded steel plates, 13 anchored steel plates, and Ushaped stirrups. 14 The FRP strengthening provides a novel solution for improving the ultimate strength of corroded beams. [15][16][17] However, there are unidentified gaps in the understanding of force transfer at the FRPreinforced interface.…”

Section: Introductionmentioning

confidence: 99%

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Liang

Zhou

et al. 2023

Structural Concrete

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This paper investigates the shear performance of corroded reinforced concrete (RC) beams with different stirrup corrosion rates and strengthening interventions. In this work, eight corroded beams strengthened with various interventions, including U-shaped stirrup, bonded steel plate, and anchored steel plate strengthening techniques, were tested under static loading. The experimental shear capacity, load-deflection response, and failure modes of the unstrengthened and strengthened specimens were carefully studied. Three shear capacity models based on GB50010-2010, ACI 318-08, and Eurocode 2 codes were proposed and discussed. The results showed that all specimens have the same failure mode, that is, the shear-compression failure. The shear capacities are improved by 17.36%-23.61% and 23.76%-38.46% by these interventions for the specimens with 10% and 20% stirrup corrosion rates, respectively. The anchored steel plate technique provides the maximum improvement in the shear capacity. Additionally, the increased stiffness of corroded specimens with strengthening interventions is apparent when the corrosion rate is 10% but not obvious when the corrosion rate is 20%. The models based on GB50010-2010 and ACI 318-08 codes were proved to have higher accuracy but may overestimate the shear capacity. In contrast, the Eurocode 2-based model comes with relatively low prediction accuracy but conservative results, and it is recommended for engineering design.

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Section: Introductionmentioning

confidence: 99%

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Liang

Zhou

et al. 2023

Structural Concrete

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“…The shear behavior of ECC elements is influenced by parameters such as (a) the diameter and spacing of transverse reinforcements, (b) shear span (a v ) to depth (h) ratio, (c) mode of failure and (d) size effect [ 17 , 18 ]. Several preceding works have investigated the ECC-based structural elements’ performance under shear loads [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Meng et al [ 19 ] examined the shear resistance of polyvinyl alcohol fiber-based ECC members with and without transverse reinforcements.…”

Section: Introductionmentioning

confidence: 99%

“…The findings revealed that using steel and PVA-based fibers in ECC elements helped to compensate for the absence of conventional transverse reinforcements. The previous studies show that the ECC members prepared using different fibers experienced failure due to the ductile flexure mode when loaded in shear [ 23 , 24 ]. Reviewing the existing literature studies, it is clear that only a handful of studies are available for understanding the shear behavior of ECC-based structural elements [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

Maheswaran

Chellapandian²,

Sivasubramanian³

et al. 2022

Materials

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The shear behavior of innovative engineered cementitious composites (ECC) members with a hybrid mix of polyvinyl alcohol (PVA) and polypropylene (PP) fibers is examined. The overall objective of the investigation is to understand the shear behavior of ECC beams with different mono and hybrid fiber combinations without compromising the strength and ductility. Four different configurations of beams were prepared and tested, including 2.0% of PP fibers, 2.0% of PVA fibers, 2.0% of steel fibers and hybrid PVA and PP fibers (i.e., 1% PP and 1% PVA). In addition to the tests, a detailed nonlinear finite element (FE) analysis was accomplished using the commercial ABAQUS software. The validated FE model was used to perform an extensive parametric investigation to optimize the design parameters for the hybrid-fiber-reinforced ECC beams under shear. The results revealed that the use of hybrid PVA and PP fibers improved the performance by enhancing the overall strength and ductility compared to the steel and PP-fiber-based ECC beams. Incorporating hybrid fibers into ECC beams increased the critical shear crack angle, indicating the transition of a failure from a brittle diagonal tension to a ductile bending.

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“…Over the past few years, several studies have been conducted on construction of reinforced concrete (RC) column or beam specimens using engineered cementitious composites (ECC, or, using another wide-spread term for this group of materials: strain-hardening cement-based composites, SHCC) or other types of high-performance fibre-reinforced cementitious composites (HPFRCC) as precast permanent formwork [4][5][6][7][8][9][10]. For instance, Pan et al [4] investigated the seismic behaviour of the RC columns produced using precast steel-reinforced ECC/SHCC permanent formwork.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the beams constructed using the ECC/SHCC permanent formwork with transverse grooves along the surface exhibited significantly higher flexural capacity than that of the beam fabricated using the ECC/SHCC permanent formwork with smooth surface. Zhang et al [7] studied the shear behaviour of the RC beams without shear reinforcement constructed using precast ECC/SHCC permanent formwork. Three different surface conditions, namely smooth interface, anchored interface and rugged interface, were prepared to investigate the interface bond strength between ECC/SHCC permanent formwork and concrete core.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Engineered, Strain-Hardening Geopolymer Composite (EGC/SHGC) as Permanent Formwork for Concrete Beam Construction

Bong¹,

Nematollahi²,

Mechtcherine³

et al. 2022

Preprint

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The extrusion-based 3D concrete printing (3DCP) technology allows the fabrication of permanent formwork with intricate shapes, into which fresh concrete is cast to build structural members with complex geometry. This significantly enhances the geometric freedom of concrete structures without the use of expensive temporary formwork. In addition, with proper material choice for the permanent formwork, the load-bearing capacity and durability of the resulting structure can be improved. This paper investigates 3DCP of permanent formwork for reinforced concrete (RC) beam construction. A 3D-printable engineered geopolymer composite (3DP-EGC, or strain-hardening geopolymer composite, 3DP-SHGC) recently developed by the authors was used for fabrication of the permanent formwork. The 3DP-EGC exhibits strain-hardening behaviour under direct tension. Two different printing patterns were used for the soffit of the permanent formwork to investigate the effect of this parameter on the flexural performance of RC beams. A conventionally mould-cast RC beam was also prepared as the control beam for comparison purposes. The results showed that the RC beams constructed using the 3DP-EGC permanent formwork exhibited superior flexural performance to the control beam. Such beams yielded significantly higher cracking load (up to 43%), deflection at ultimate load (up to 60%), ductility index (50%) and absorbed energy (up to 107%) than those of the control beam. The ultimate load was comparable with or slightly higher than that of the control beam. Furthermore, the printing pattern at the soffit of the permanent formwork was found to have a significant influence on the flexural performance of the RC beams.

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Shear behavior of RC slender beams without stirrups by using precast U-shaped ECC permanent formwork

Cited by 36 publications

References 13 publications

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

3D Printed Engineered, Strain-Hardening Geopolymer Composite (EGC/SHGC) as Permanent Formwork for Concrete Beam Construction

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