Abstract
The hybrid steel trussed concrete beams examined in the present study are comprised of two principal components, i.e., a steel joist with inclined rebars, realized in industry, which is welded to a smooth steel plate and then embedded within the concrete cast in situ. The paper presents first the state of the art on laboratory tests and analytical modeling of the steel-to-concrete stress transfer mechanism investigated by push-out tests. Next, the most relevant scientific contributions currently available in the technical literature regarding experimental investigation on actual shear behavior are summarized and discussed. Lastly codes and analytical models are reviewed.
Highlights
A Hybrid Steel Trussed Concrete Beam (HSTCB) is a structural element consisting of a lattice metal beam, with a prefabricated concrete or steel caseback, embedded in whole or in part in concrete casting in place
It can be observed that spalling of the concrete corresponding to the inferior face of the beam is prevented by the presence of the bottom steel plate
He stressed that: understanding of the stress transfer mechanisms between the steel members and the concrete is an aspect of paramount importance since the connection has to be provided almost solely by the steel truss; and that, considering the limitation of the bond stress, the arch effect that is activated in the shear failure mechanism of HSTCBs, is a preeminent contribution, which leads to an increased risk of failure due to crushing of the compressed concrete strut
Summary
A Hybrid Steel Trussed Concrete Beam (HSTCB) is a structural element consisting of a lattice metal beam, with a prefabricated concrete or steel caseback, embedded in whole or in part in concrete casting in place. The key problems scrutinized in Phase II regard the stress transfer mechanisms between steel and concrete [4,5,6,7,8,9,10,11,12], assessment of bending and shear strength [13,14,15,16,17,18,19,20], beam-column joint performance under static, cyclic [21,22,23,24,25,26] and seismic [27] loads, and assessment of deformability at short and long-term [28] In this context, in the present paper, first the state of the art on laboratory tests and the analytical modeling of the steel-to-concrete stress transfer mechanism investigated by push-out tests are focused on. The most relevant scientific contributions currently available in the technical literature regarding experimental investigation on actual shear behavior are summarized and discussed; lastly, code and analytical design-oriented models proposed in the literature are reviewed
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