Experimental study on the uniaxial compression performance of ultrahigh-performance concrete constrained by stirrups and fibers

Chang, Yafeng; Shi, Junping; Hou, Yapeng; Lu, Tingting

doi:10.1016/j.engstruct.2021.112656

Cited by 9 publications

(8 citation statements)

References 36 publications

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“…Figure 5 is a schematic of the cross-sectional stress of UHPC constrained by stirrups. The restraining force generated by stirrups on UHPC is assumed to be uniformly distributed on the cross section; this method is different from that of Chang et al (2021). Moreover, the hoop strains of UHPC materials on the cross section are equal.…”

Section: Equation Generated By Stirrupsmentioning

confidence: 99%

“…(2) Compared with the design-oriented model by Chang et al (2021), the change in hoop restraint stress with strain path is considered.…”

Section: Peak Stress Of Uhpc Constrained By Stirrups Based On Strain ...mentioning

confidence: 99%

“…Steel fibers can effectively inhibit the protective layer of UHPC columns from falling off, and decreasing the spacing of transverse reinforcement can effectively improve the ductility of UHPC columns after peak axial compression(Shin et al (2015, 2017). Chang et al (2021) found that the restraining effect of an end hook-shaped steel fiber prevents the protective layer from peeling off when the UHPC column is destroyed. The restraining effect of specimens with dense stirrups is significant, and the deformability is improved.…”

Section: Introductionmentioning

confidence: 99%

“…While, Razvi and Saatcioglu (1999) focused on factors, such as spiral stirrup, linear stirrup, cross stirrup, and welded steel wire fabric. Chang et al (2021) revised the effective restraint coefficient of stirrups proposed by Mander though considering the fiber restraint coefficient, and they established an axial stress–strain model of UHPC restrained by stirrup. The specimens experiencing stress reduction, or a parabolic first portion and an ascending linear second portion (Liao et al, 2022) were adopted to established a stress–strain model for UHPC restrained by fiber-reinforced polymer (FRP).…”

Section: Introductionmentioning

confidence: 99%

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Strain-path-dependent stress–strain model for ultrahigh-performance concrete columns constrained by stirrups

Chang

Shi

Cao

et al. 2022

Advances in Structural Engineering

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The incorporation of steel fibers improves the microscopic ductility of ultrahigh-performance concrete (UHPC) materials, and their macroscopic ductility can also be improved by the restraining effect of composite stirrups. Two defects can be found in the stress–strain model of UHPC restrained by stirrups based on the design-oriented method: the restraint coefficient of the stirrup is the effective restraint coefficient at the peak state of the specimen, while the variation in the restraint stress of the stirrup with the axial–hoop strain relationship (strain path) is ignored. In this study, a strain-path-dependent stress–strain model for UHPC constrained by stirrups and fibers is proposed through a database with 10 sets of test results on UHPC columns, which alleviates the shortcomings of the design-oriented model. (1) On the basis of the axial–hoop strain relationship curve in the test results, an axial–hoop strain model of UHPC restrained by stirrups is established. (2) The variation in the restraint stress of the stirrup with strain path is considered. (3) On the basis of the stress–strain model of actively constrained concrete, an iterative method of subsections is adopted, and a UHPC stress–strain model restrained by stirrup based on strain path is established. Results show that the established axial–hoop strain equation can better predict the hoop strain of UHPC restrained by stirrups and steel fibers, the calculated value of peak stress of UHPC constrained by stirrups based on strain path is in good agreement with the test results, and the outcomes of the path-dependent stress–strain model are in better agreement with the experimental results than those of the design-oriented stress–strain model.

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Section: Equation Generated By Stirrupsmentioning

confidence: 99%

“…(2) Compared with the design-oriented model by Chang et al (2021), the change in hoop restraint stress with strain path is considered.…”

Section: Peak Stress Of Uhpc Constrained By Stirrups Based On Strain ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strain-path-dependent stress–strain model for ultrahigh-performance concrete columns constrained by stirrups

Chang

Shi

Cao

et al. 2022

Advances in Structural Engineering

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“…Some concrete materials are developed to be eco-friendly, making use of environmental wastes and minimizing embodied carbon. Others are designed to optimize a set of objective functions, such as ECC, fiber reinforced concrete (FRC), or high-performance concrete (HPC), for optimized durability [11,12], compressive performance [11,13,14], tensile and flexural performance [15][16][17], crack mitigation [18], etc.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on 3D Printed Cementitious Composites Mixes Subjected to Axial Compression

et al. 2021

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Aptly enabled by recent developments in additive manufacturing technology, the concept of functionally grading some cementitious composites to improve structural compression forms is warranted. In this work, existing concrete models available in Abaqus Finite Element (FE) packages are utilized to simulate the performance of some cementitious composites numerically and apply them to functional grading using the multi-layer approach. If yielding good agreement with the experimental results, two-layer and three-layer models case combinations are developed to study the role of layer position and volume. The optimal and sub-optimal performance of the multi-layer concrete configurations based on compressive strength and sustained strains are assessed. The results of the models suggest that layer volume and position influence the performance of multi-layer concrete. It is observed that when there exists a substantial difference in material strengths between the concrete mixes that make up the various layers of a functionally graded structure, the influence of position and of material volume are significant in a two-layer configuration. In contrast, in a three-layer configuration, layer position is of minimal effect, and volume has a significant effect only if two of the three layers are made from the same material. Thus, a multilayered design approach to compression structures can significantly improve strength and strain performance. Finally, application scenarios on some structural compression forms are shown, and their future trajectory is discussed.

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Peak and ultimate stress-strain model of confined ultra-high-performance concrete (UHPC) using hybrid machine learning model with conditional tabular generative adversarial network

Wakjira,

Alam

2024

Applied Soft Computing

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Experimental study on the uniaxial compression performance of ultrahigh-performance concrete constrained by stirrups and fibers

Cited by 9 publications

References 36 publications

Strain-path-dependent stress–strain model for ultrahigh-performance concrete columns constrained by stirrups

Strain-path-dependent stress–strain model for ultrahigh-performance concrete columns constrained by stirrups

A Numerical Study on 3D Printed Cementitious Composites Mixes Subjected to Axial Compression

Peak and ultimate stress-strain model of confined ultra-high-performance concrete (UHPC) using hybrid machine learning model with conditional tabular generative adversarial network

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