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Experimental analysis of the flexural behaviour of precast concrete composite beams with discontinuous connections
Abstract Full-depth precast deck panels hold the potential to enhance constructability and productivity, and reduce the costs associated with highway bridges. This paper investigates the influence of discontinuous shear connections between girders and panels on the flexural behaviour of composite beams. Experimental findings from precast composite beams and direct shear tests are presented, including L-shape push-off tests and double shear tests to determine resistance at rough concrete-to-concrete plain interfaces and shear pocket connections. Composite beams with a full-depth precast slab connected through a shear pocket with shear keys into the upper face of a precast beam exhibit equivalent flexural resistance to monolithic beams when shear pocket spacing remains below the effective depth of the composite beam. However, composite beams with shear pockets featuring plain interfaces show a reduction in flexural resistance of up to 30% compared to monolithic beams. Moreover, composite beams with shear keys demonstrate interface shear stiffness up to four times greater than those with plain interfaces, indicating full interaction. The paper proposes simplified equations to estimate flexural resistance for composite beams with full-depth precast slabs joined by shear pockets, showing a coefficient of variation of only 12% compared to experimental results, offering a reliable method for predicting flexural resistance in composite beams with discontinuous connections.
Highlights An empirical equation derived from direct shear tests is proposed for rough plane surfaces. Two types and spacing of shear pockets in composite beam were analysed. Composite beams with shear keys exhibit high interface shear stiffness. Under cyclic loading, composite beams with shear keys demonstrate minimal stiffness loss. Simplified equations for estimating the flexural resistance of composite beams are proposed.
Experimental analysis of the flexural behaviour of precast concrete composite beams with discontinuous connections
Abstract Full-depth precast deck panels hold the potential to enhance constructability and productivity, and reduce the costs associated with highway bridges. This paper investigates the influence of discontinuous shear connections between girders and panels on the flexural behaviour of composite beams. Experimental findings from precast composite beams and direct shear tests are presented, including L-shape push-off tests and double shear tests to determine resistance at rough concrete-to-concrete plain interfaces and shear pocket connections. Composite beams with a full-depth precast slab connected through a shear pocket with shear keys into the upper face of a precast beam exhibit equivalent flexural resistance to monolithic beams when shear pocket spacing remains below the effective depth of the composite beam. However, composite beams with shear pockets featuring plain interfaces show a reduction in flexural resistance of up to 30% compared to monolithic beams. Moreover, composite beams with shear keys demonstrate interface shear stiffness up to four times greater than those with plain interfaces, indicating full interaction. The paper proposes simplified equations to estimate flexural resistance for composite beams with full-depth precast slabs joined by shear pockets, showing a coefficient of variation of only 12% compared to experimental results, offering a reliable method for predicting flexural resistance in composite beams with discontinuous connections.
Highlights An empirical equation derived from direct shear tests is proposed for rough plane surfaces. Two types and spacing of shear pockets in composite beam were analysed. Composite beams with shear keys exhibit high interface shear stiffness. Under cyclic loading, composite beams with shear keys demonstrate minimal stiffness loss. Simplified equations for estimating the flexural resistance of composite beams are proposed.
Experimental analysis of the flexural behaviour of precast concrete composite beams with discontinuous connections
Araújo, D.L. (author) / Borges, Vanessa Elizabeth dos Santos (author) / Bernardes, Efraim Soares (author) / El Debs, Mounir Khalil (author)
Engineering Structures ; 308
2024-03-27
Article (Journal)
Electronic Resource
English
Flexural behaviour of headed bar connections between precast concrete panels
| British Library Online Contents | 2017
Flexural behaviour of headed bar connections between precast concrete panels
| Online Contents | 2017
Flexural behaviour of headed bar connections between precast concrete panels
| British Library Online Contents | 2017