Imperial College London
Alternate

ProfessorRobertVollum

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Structural Concrete
 
 
 
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Contact

 

+44 (0)20 7594 5992r.vollum

 
 
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Location

 

323Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Vella:2017:10.1016/j.engstruct.2017.02.018,
author = {Vella, JP and Vollum, RL and Jackson, A},
doi = {10.1016/j.engstruct.2017.02.018},
journal = {Engineering Structures},
pages = {351--366},
title = {Investigation of headed bar joints between precast concrete panels},
url = {http://dx.doi.org/10.1016/j.engstruct.2017.02.018},
volume = {138},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 barsminimises the lap length required within the cast-in-situ joint region. Confining reinforcement in the form of transverse barsand vertical shear studs is also installed in the joint. Thepaperdescribes a series of tensile tests which were carried out to simulatethe tensile zone of a joint loaded in pure flexure. The headedbars used in the tests were 25mm in diameter with 70mm square headsand yield strength of 530MPa. The tests studiedthe influences of concrete strength, headed bar spacing, splice length, transverse reinforcement and confining shear studs on joint strength. Alap length of 100mm in concretewith 28MPa cylinder strengthwas 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 goodpredictionsof joint strength in most cases, although it also does not always capture the correct failure mechanism. Thetests provideinsights into joint behaviour which, in conjunction with numerical modelling, will facilitate the development of animproved design method. Widespread use of this system would lead to improvements in buildability, sustainability and health and safety in the construction of concrete structures.
AU  - Vella,JP
AU  - Vollum,RL
AU  - Jackson,A
DO  - 10.1016/j.engstruct.2017.02.018
EP  - 366
PY  - 2017///
SN  - 0141-0296
SP  - 351
TI  - Investigation of headed bar joints between precast concrete panels
T2  - Engineering Structures
UR  - http://dx.doi.org/10.1016/j.engstruct.2017.02.018
UR  - http://hdl.handle.net/10044/1/44362
VL  - 138
ER  -
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