Analytical evaluation of steel–concrete composite trussed beam shear capacity

Abstract

A calculation method for the prediction of the shear resistance of precast composite beams, named Hybrid Steel Trussed-Concrete Beams (HSTCBs), is herein proposed. HSTCBs are constituted by a prefabricated steel truss embedded within a concrete matrix cast in situ so that, after curing, the two materials work together in the mechanical response of the composite structural element, the steel truss behaving as reinforcement of the beam. The proposed analytical model is developed on the basis of the results of a reference experimental campaign of three-point bending tests available in the literature, carried out on specimens of HSTCB designed in order to attain a shear failure. Furthermore, the proposed analytical formulation is supported by the outcomes of the finite element modeling available in the literature concerning the abovementioned reference tests. The model presents an additive formulation in which the shear resistance of the HSTCB consists of the contribution from concrete and shear reinforcement, being the diagonal rebars of the steel truss regarded as the stirrups typically present in Reinforced Concrete (R.C.) beams. Finally, also the contribution of the steel plate is taken into account in the resisting mechanism. Both reference experimental and numerical results are employed for the validation of the proposed analytical expressions and, with the aim of widening such a validation, also further experimental data available in the literature are taken into account, dealing with bending tests with shear failure on a similar typology of HSTCB

Improved Finite Beam Element Method to Analyze the Natural Vibration of Steel-Concrete Composite Truss Beam

“…Hence, the corresponding shape function can only satisfy the continuity condition for 0 . Further, (9) shows that the shape function of the deflection function ( ) must satisfy the continuity condition of 1 . According to the principle of numerical calculation, in order to satisfy the continuity condition of 1 , the Hermite polynomial has to be at least cubic.…”

“…According to the principle of numerical calculation, in order to satisfy the continuity condition of 1 , the Hermite polynomial has to be at least cubic. However, (9) shows that the contribution of the deflection function ( ) to the cross-section rotation function ( ) is a quadratic polynomial. Hence, in order to satisfy the consistency requirements, the displacement functions ( ) and ( ) have to be approximated using the quadratic polynomials.…”

“…Monti and Petrone [8] developed the shear capacity equations from a purposely developed mechanics-based shear model for hybrid steeltrussed-concrete beams. Campione et al [9] investigated a calculation method for the prediction of the shear resistance of precast composite beam; both experimental and numerical results were used to validate the developed analytical expressions.…”

Performance of RC Beams with Embedded Steel Trusses Using Nonlinear FEM Analysis

“…Nowadays, interest for this technology is growing up, mainly because of some advantages it provides with respect to the common reinforced concrete beams. However, neither in the current American nor in the European codes there are specific regulations for this type of reinforced concrete beam [4,5].…”

“…Trentadue et al [8] developed an analytical approach to estimate the critical elastic moment in order to compute the final design lateral-torsional buckling resistance moment in special truss-reinforced composite steel-concrete beams. Furthermore, an analytical method for prediction of the shear resistance of precast composite beams is proposed in [4]. e suggested analytical model was developed in [9,10], based on an experimental program carried out on a threepoint bending tests of hybrid steel trussed concrete beams designed in order to attain a shear failure.…”