Browsing by Author "Plizzari, Giovanni"
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- Bending resistance of composite steel truss and concrete beamPublication . Silva, Mickaël Jorge da; Piloto, P.A.G.; Roque, Sérgio; Vila Real, Paulo M.M.; Plizzari, GiovanniThis study presents the numerical simulation of the bending resistance of CSTCB in stage 1 (element made only by the self-supported steel truss and base plate). Two different base plates were considered (Steel and Concrete) and two different types of steel trusses (Type I and II). The numerical results are also compared with analytical results, assuming the full interaction between steel truss and concrete, neglecting the tensile strength of concrete, considering the effective area of concrete stressed up to the compressive resistance. The design followed the general rules for steel and concrete structures [1-9].
- Evaluation of the resistance moment for the initial stage of composite steel truss and concrete beamPublication . Roque, Sérgio; Vila Real, Paulo M.M.; Piloto, P.A.G.; Plizzari, GiovanniComposite Steel Truss and Concrete Beam (CSTCB) are composite elements designed to resist bending, consisting of a steel truss encased in concrete casted in place, with a steel base plate or pre-casted concrete plate. Design resistance moment was determined for the initial constructive stage, using simply supported truss beam with three-point bending load. Two different typologies were compared for three different beam lengths, using three dimensional finite element analyses. Critical load was determined for different buckling mode shapes, using linear elastic analysis. The first mode and two other particular buckling mode shapes were considered as initial imperfection modes. The resistance moment was calculated, based on geometric and material non-linear analysis.
- Experimental investigation of the fire resistance of partially encased beamsPublication . Piloto, P.A.G.; Ramos Gavilán, Ana Belén; Zipponi, Marco; Marini, Alberto; Mesquita, L.M.R.; Plizzari, GiovanniThis research presents the fire resistance of Partially Encased Beams (PEB). Fire resistance was determined by means of twelve experimental tests, according to European standard EN1363-1, for different load levels and shear conditions between stirrups and web steel. Three tests were also performed at room temperature for load bearing resistance. The experimental setup was designed for this purpose, using a small fire resistance furnace and portal reaction frame. Details about the specimens tested, the instruments used and the characteristics of the materials, are also presented. Load-deflection and load-strain results were determined at room temperature. Deflection and temperature measurements were determined under ISO834 fire exposure. Results reveal the dependence of fire resistance on load level. An increase in 37% on load level is responsible for a decrease in 28% on fire resistance. Tests developed for the highest load level present similar fire resistance, independently of the shear condition; however, tests with welded stirrups present higher critical time. The main experimental results are presented and discussed. Particular emphasis was given to changes in temperature for each material, and on the global thermo-mechanical behaviour of this composite steel and concrete element.
- Fire behaviour of composite steel truss and concrete beamPublication . Piloto, P.A.G.; Roque, Sérgio; Vila Real, Paulo M.M.; Plizzari, GiovanniThis work compares the thermal behaviour on four different Composite Steel Truss and Concrete Beam (CSTCB), when submitted to two different fire conditions (one side and four sides of fire exposure). This analysis aims to be a preliminary assessment of a series of experimental tests. CSTCB with concrete plate delay temperature evolution on the steel truss and reinforcement, increasing fire resistance.
- Fire behaviour of composite steel truss and concrete beamPublication . Piloto, P.A.G.; Roque, Sérgio; Vila Real, Paulo M.M.; Plizzari, GiovanniThis work compares the thermal behaviour on four different Composite Steel Truss and Concrete Beam (CSTCB), when submitted to two fire conditions (one side and four sides). This analysis aims to be a preliminary assessment of a series of experimental tests. CSTCB with pre-cast plate delay temperature evolution on the steel truss and reinforcement, increasing fire resistance.