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Shear strength of self-compacting concrete dry joints subjected to combined axial, bending and shear forces in precast concrete segmental bridges
Abstract Castellated dry joints between segmental elements represent zones of discontinuity that affect the behaviour of precast concrete segmental bridges (PCSBs). These joints must be capable of transmitting combined axial, bending and shear forces. Under service conditions, the joints in PCSBs are designed to be closed, but can be allowed to be open under failure conditions. Experimental and numerical dry joint studies have focused mainly on the behaviour of dry joints subjected to direct shear with different confinement levels. However, the number of studies and tests with castellated dry joints under axial, bending and shear forces is very limited. Although self-compacting concrete (SCC) use is becoming increasingly common in precast concrete, shear resistance behaviour significantly differs between elements made of conventional vibrated concrete (CC) and SCC. No experimental tests of castellated dry joints made of normal-strength self-compacting concrete (NS-SCC) have been found. This work presents an experimental programme of 24 tests to understand the shear transfer mechanism through NS-SCC single-keyed and multi-keyed dry joints subjected to combined axial, bending and shear forces. In this work, a new test for push-off dry joint specimens subjected to combined shear and axial forces with or without eccentricity was designed. Significant differences were observed between closed and open joints regarding cracking patterns, joint kinematics, resistance mechanisms and failure mode. The experimental test results were compared to the provisions from AASHTO and Fouré . The analysed expressions generally overestimated closed and open joints’ shear capacity.
Highlights A new push-off dry joint test under combined forces was designed. 24 push-off dry joint specimens under axial, bending and shear forces were tested. The impact of number of keys, confining stress level and eccentricity was studied. Different shear behaviour was observed between open and closed dry joints. Design formulas AASHTO and Fouré overestimated NS-SCC dry joints’ shear strength.
Shear strength of self-compacting concrete dry joints subjected to combined axial, bending and shear forces in precast concrete segmental bridges
Abstract Castellated dry joints between segmental elements represent zones of discontinuity that affect the behaviour of precast concrete segmental bridges (PCSBs). These joints must be capable of transmitting combined axial, bending and shear forces. Under service conditions, the joints in PCSBs are designed to be closed, but can be allowed to be open under failure conditions. Experimental and numerical dry joint studies have focused mainly on the behaviour of dry joints subjected to direct shear with different confinement levels. However, the number of studies and tests with castellated dry joints under axial, bending and shear forces is very limited. Although self-compacting concrete (SCC) use is becoming increasingly common in precast concrete, shear resistance behaviour significantly differs between elements made of conventional vibrated concrete (CC) and SCC. No experimental tests of castellated dry joints made of normal-strength self-compacting concrete (NS-SCC) have been found. This work presents an experimental programme of 24 tests to understand the shear transfer mechanism through NS-SCC single-keyed and multi-keyed dry joints subjected to combined axial, bending and shear forces. In this work, a new test for push-off dry joint specimens subjected to combined shear and axial forces with or without eccentricity was designed. Significant differences were observed between closed and open joints regarding cracking patterns, joint kinematics, resistance mechanisms and failure mode. The experimental test results were compared to the provisions from AASHTO and Fouré . The analysed expressions generally overestimated closed and open joints’ shear capacity.
Highlights A new push-off dry joint test under combined forces was designed. 24 push-off dry joint specimens under axial, bending and shear forces were tested. The impact of number of keys, confining stress level and eccentricity was studied. Different shear behaviour was observed between open and closed dry joints. Design formulas AASHTO and Fouré overestimated NS-SCC dry joints’ shear strength.
Shear strength of self-compacting concrete dry joints subjected to combined axial, bending and shear forces in precast concrete segmental bridges
Traver-Abella, Celia (author) / Bonet, José L. (author) / Miguel, Pedro F. (author) / Fernández-Prada, Miguel Ángel (author)
Engineering Structures ; 303
2024-01-05
Article (Journal)
Electronic Resource
English
Shear Strength of Joints in Precast Concrete Segmental Bridges
| Online Contents | 2005
SHEAR STRENGTH OF JOINTS IN PRECAST CONCRETE SEGMENTAL BRIDGES
| British Library Conference Proceedings | 2003
Discussion - Shear Strength of Joints in Precast Concrete Segmental Bridges.
| Online Contents | 2005