Composite structures paper
Ataei, A, Bradford, MA & Liu, X 2014, 'Sustainable composite beams and joints with deconstructable table bolted shear connectors', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 621-626. ISBN: 9780994152008.
Composite action between the concrete slab and steel beam in a building frame is typically achieved by using headed stud shear connectors that are welded to the top flange of the steel beam to produce robust shear connection, but their demolition necessarily is associated with much waste and uses considerable energy. Moreover, the slab is usually cast in situ onto profiled steel decking with conventional reinforcement placed on site, which is time consuming and labour intensive and which can increase the construction costs considerably. This paper describes the results of three push-out tests conducted to determine the load-slip behaviour of deconstructable bolted shear connectors for precast concrete slabs in a configuration which can be used in composite beams and joints. In this system, precast “green concrete” slabs having reduced emissions during their manufacture are attached compositely to the steel beam via post-installed pre-tensioned bolt shear connectors. Based on the experimental results, the structural behaviour of these new systems is assessed and compared with traditional stud shear connectors. The test results show that the behaviour of post-installed pretensioned bolted shear connectors is completely different to stud shear connectors, and these connectors provide reliable and adequate shear connection to composite beams and connections with precast concrete slabs.