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Investigation of headed bar joints between precast concrete panels
HighlightsLaboratory tests on headed bar tension splices.Full strength of 25mmbars developed with 100mm lap.Strength of splice dependent on transverse reinforcement bar arrangement.Strut and tie method shown to be conservative for design.
AbstractThe paper addresses the design and behaviour of narrow cast in-situ joints between precast concrete elements in which continuity of reinforcement is achieved through overlapping headed bars. Using headed bars minimises the lap length required within the cast-in-situ joint region. Confining reinforcement in the form of transverse bars and vertical shear studs is also installed in the joint. The paper describes a series of tensile tests which were carried out to simulate the tensile zone of a joint loaded in pure flexure. The headed bars used in the tests were 25mm in diameter with 70mm square heads and yield strength of 530MPa. The tests studied the influences of concrete strength, headed bar spacing, splice length, transverse reinforcement and confining shear studs on joint strength. A lap length of 100mm in concrete with 28MPa cylinder strength was found to be sufficient to develop the full strength of the headed bars. A strut-and-tie model (STM) is presented for determining joint strength. Analysis shows that the STM gives safe results even though it does not fully capture the observed joint behaviour. An upper bound plasticity model is found to give relatively good predictions of joint strength in most cases, although it also does not always capture the correct failure mechanism. The tests provide insights into joint behaviour which, in conjunction with numerical modelling, will facilitate the development of an improved design method. Widespread use of this system would lead to improvements in buildability, sustainability and health and safety in the construction of concrete structures.
Investigation of headed bar joints between precast concrete panels
HighlightsLaboratory tests on headed bar tension splices.Full strength of 25mmbars developed with 100mm lap.Strength of splice dependent on transverse reinforcement bar arrangement.Strut and tie method shown to be conservative for design.
AbstractThe paper addresses the design and behaviour of narrow cast in-situ joints between precast concrete elements in which continuity of reinforcement is achieved through overlapping headed bars. Using headed bars minimises the lap length required within the cast-in-situ joint region. Confining reinforcement in the form of transverse bars and vertical shear studs is also installed in the joint. The paper describes a series of tensile tests which were carried out to simulate the tensile zone of a joint loaded in pure flexure. The headed bars used in the tests were 25mm in diameter with 70mm square heads and yield strength of 530MPa. The tests studied the influences of concrete strength, headed bar spacing, splice length, transverse reinforcement and confining shear studs on joint strength. A lap length of 100mm in concrete with 28MPa cylinder strength was found to be sufficient to develop the full strength of the headed bars. A strut-and-tie model (STM) is presented for determining joint strength. Analysis shows that the STM gives safe results even though it does not fully capture the observed joint behaviour. An upper bound plasticity model is found to give relatively good predictions of joint strength in most cases, although it also does not always capture the correct failure mechanism. The tests provide insights into joint behaviour which, in conjunction with numerical modelling, will facilitate the development of an improved design method. Widespread use of this system would lead to improvements in buildability, sustainability and health and safety in the construction of concrete structures.
Investigation of headed bar joints between precast concrete panels
Vella, Jean Paul (author) / Vollum, Robert L. (author) / Jackson, Andrew (author)
Engineering Structures ; 138 ; 351-366
2017-02-06
16 pages
Article (Journal)
Electronic Resource
English
Flexural behaviour of headed bar connections between precast concrete panels
| British Library Online Contents | 2017
Headed Bar Connections Between Precast Concrete Panels Loaded in Bending
| Springer Verlag | 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