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Analytical models for stress–strain behaviour of UHPC confined with spiral stirrups
Highlights The shear-compression failure modes confined UHPC were explained, and the effects of parameters on the axial stress–strain curves of confined UHPC were analyzed. The prediction models for the axial stress–strain curves of confined UHPC were established. The prediction models for the peak stress and peak strain curves of confined UHPC were developed.
Abstract The axial stress–strain models of confined ultra-high performance concrete (UHPC) were important key inputs for analytical programs to predict the full-range loading deformation of confined UHPC. The concrete columns confined with stirrups under axial compression tended to be a failure in shear-compression failure. However, the existing models for evaluating the axial stress–strain models of confined UHPC did not consider the shear-compression failure. In this paper, an experiment on the axial stress–strain behaviour of confined UHPC was presented. The specimens consisted of 75 UHPC with compressive strength up to 155.45 MPa were confined by spiral stirrups. According to test results, a theoretical model for axial stress–strain curves of confined UHPC by considering the shear-compression mechanism of UHPC was developed. In the proposed models, the real lateral stress of stirrups was adopted to calculate the lateral confinement of stirrups, rather than assumed that the stirrups reached the yield strength. In addition, the effects of dowel action of stirrups and longitudinal reinforcement were considered. Furthermore, the prediction models for the compression behaviour indicators of confined UHPC included peak stress, peak strain, initial tangent modulus, residual stress, and residual strain were proposed. By comparing with existing models, the proposed analytical models of axial stress–strain curves of confined UHPC had high accuracy and high stability.
Analytical models for stress–strain behaviour of UHPC confined with spiral stirrups
Highlights The shear-compression failure modes confined UHPC were explained, and the effects of parameters on the axial stress–strain curves of confined UHPC were analyzed. The prediction models for the axial stress–strain curves of confined UHPC were established. The prediction models for the peak stress and peak strain curves of confined UHPC were developed.
Abstract The axial stress–strain models of confined ultra-high performance concrete (UHPC) were important key inputs for analytical programs to predict the full-range loading deformation of confined UHPC. The concrete columns confined with stirrups under axial compression tended to be a failure in shear-compression failure. However, the existing models for evaluating the axial stress–strain models of confined UHPC did not consider the shear-compression failure. In this paper, an experiment on the axial stress–strain behaviour of confined UHPC was presented. The specimens consisted of 75 UHPC with compressive strength up to 155.45 MPa were confined by spiral stirrups. According to test results, a theoretical model for axial stress–strain curves of confined UHPC by considering the shear-compression mechanism of UHPC was developed. In the proposed models, the real lateral stress of stirrups was adopted to calculate the lateral confinement of stirrups, rather than assumed that the stirrups reached the yield strength. In addition, the effects of dowel action of stirrups and longitudinal reinforcement were considered. Furthermore, the prediction models for the compression behaviour indicators of confined UHPC included peak stress, peak strain, initial tangent modulus, residual stress, and residual strain were proposed. By comparing with existing models, the proposed analytical models of axial stress–strain curves of confined UHPC had high accuracy and high stability.
Analytical models for stress–strain behaviour of UHPC confined with spiral stirrups
Chang, Wei (author) / Zheng, Wenzhong (author) / Hao, Meijing (author)
2023-10-10
Article (Journal)
Electronic Resource
English
Analytical Stress-Strain Relationship for Concrete Confined by Steel Stirrups and-or FRP Jackets
| Online Contents | 2006
Analytical Stress-Strain Relationship for Concrete Confined by Steel Stirrups and/or FRP Jackets
| British Library Online Contents | 2006