Headed Bar Connections Between Precast Concrete Panels Loaded in Bending

Vella, Jean Paul; Vollum, Robert L.; Jackson, Andrew

doi:10.1007/978-3-319-59471-2_115

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Figure 17 shows that a 5 mm offset had negligible effect on joint performance, while a 10 mm offset resulted in a 5% reduction in strength with no influence on joint stiffness. The 5% reduction in strength is comparable to the 10% reduction in bending resistance observed for the same offset (Vella et al, 2017b) in a flexural test of the joint configuration shown in Figure 1. Further research is required to fully determine the influence of construction tolerances on joint strength but the effect seems relatively small.…”

Section: Vertical Offset Of Headed Barssupporting

confidence: 66%

Numerical modelling of headed bar joints subjected to tension

Vella

Vollum

Jackson

2017

Magazine of Concrete Research

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The paper addresses the analysis and design 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. The paper describes a nonlinear finite element model (NLFEM) which was used to simulate a series of tension splice tests carried out by the authors to simulate the tensile zone of a joint loaded in pure flexure. The tests studied the influences of concrete strength, transverse reinforcement, confining shear studs, headed bar spacing and lap length on joint strength. Results show that the NLFEM captures the behaviour of the joint well.Parametric studies are carried out with the validated numerical model to investigate the effects of variables not considered in the tests such as shear stud size, cover and out-of-plane offset of the headed bars. The NLFEM provides otherwise unavailable insights into joint behaviour and is considered suitable for the design of standard joint configurations. Additionally, it can assist the development of design oriented analysis methods.

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Section: Vertical Offset Of Headed Barssupporting

confidence: 66%

Numerical modelling of headed bar joints subjected to tension

Vella

Vollum

Jackson

2017

Magazine of Concrete Research

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“…Modernization of structural solutions of joints, proposed by scientists and engineers, is reduced to minimizing costs during construction, reducing the material consumption of the joint, increasing strength characteristics, reducing deformability. The possibility of using reinforcement with a shorter overlap length [32,33], continuous reinforcement [34], reducing the joint width [35], using new anchor designs [6], as well as new forms of rods and dowels [24,36] is widely discussed. Separately, we can distinguish solutions based on the use of welded loop-shaped embedded parts in the joints [37,38], for which multi-factor experiments established the bearing capacity for shear and tension, determined the destructive loads, proposed models of the joint action of the moment and the tensile force, described the schemes of crack formation and destruction.…”

Section: Introductionmentioning

confidence: 99%

Structural solution of the horizontal joint of floor slabs in girderless frame

Mironova

2021

E3S Web Conf.

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Despite the widespread use of monolithic construction, precast concrete remains in demand in the construction of residential and administrative buildings. Regardless of the advantages in technology and the quality of work, it is necessary and appropriate to modernize the existing design solutions, which allows you to simplify and speed up the technological operations during construction. Moreover, in the construction of complex nodes and joints, the qualification of workers is important, so simplifying the work without losing the quality of construction and ensuring strength, stability and durability is an important task. This problem can be solved by using modern embedded parts in the joints that do not require welding and other complex technological operations. In this paper, a constructive solution of the horizontal joint of the floor slabs located in the zone of action of minimal forces is proposed on the example of a girderless frame. The purpose of the study is to determine the stress-strain state of the proposed structural solution of the horizontal joint of floor slabs using loopshaped embedded parts «PFEIFER» and to develop recommendations for determining the shear compliance. Based on the analysis of the results of numerical modeling, the features of the stress-strain state of the joint during shear operation are revealed. The results obtained can be used in the design of buildings with precast-monolithic ringless frames, in the modernization of existing standard solutions of precast-monolithic frames, as well as other load-bearing systems made of precast concrete.

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Investigation of headed bar joints between precast concrete panels

Vella

Vollum

Jackson

2017

Engineering Structures

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The 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 with in the cast - in - situ joint region. Confining reinforcement in the form of transverse bars and vertical shear studs is also installed in the joint. Th e 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 25 mm in diameter with 70 mm square heads and yield strength of 5 30 MPa. The tests studied the influences of concrete strength, headed bar spacing, splice length, transverse reinforcement and conf ining shear studs on joint strength . A lap length of 100 mm in concrete with 28 MPa 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. Analys is 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 capt ure 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. W idespread use of this system would lead to improvements in bui ldability, sustainability and health and safety in the construction of concrete structures

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Headed Bar Connections Between Precast Concrete Panels Loaded in Bending

Cited by 4 publications

References 4 publications

Numerical modelling of headed bar joints subjected to tension

Numerical modelling of headed bar joints subjected to tension

Structural solution of the horizontal joint of floor slabs in girderless frame

Investigation of headed bar joints between precast concrete panels

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