Experimental Behaviour of Composite Girders With Steel Undulating Web and Thin‐walled Shear Connectors Hilti Stripcon

Abstract

Two tests of real‐size composite steel and concrete girders are described. The girders had spans 7,5 m, thin‐walled undulating webs (WT girders) and concrete deck 120/1500 mm concreted into profile steel sheeting TR 60/235/0,75. Thin‐walled shear connectors Hilti Stripcon were used and fastened via powder actuated fasteners. Setup of the tests, relevant instrumentation and measuring procedure are presented. The girder tests supplemented large series of push tests of connectors Stripcon performed at CTU in Prague. One of the composite girders was designed with full‐shear connection while the second one with extremely low partial shear connection (44 %). Simple preliminary linear calculations proved that experimental strength capacities of the girders are in good agreement with the calculated values, however, the deflection are due to flexibility of the connectors higher. Buckling shear capacity of the undulating webs in both tests was higher than shear at collapse of the girders. Another test dealing with interaction of web buckling in shear and Stripcon shear connection is under progress. Comparison of theoretical and experimental results is performed and recommendations for practical design are presented.

Cracking and Strength of Reinforced Concrete Structures in Flexure Strengthened With Carbon Fibre Laminates

“…Research results received by many authors show that the cracking moment in reinforced concrete beams with carbon fibre reinforcement may increase from 12 % to 230 %. In strengthened flexural members cracks are found in bigger numbers and closer to each other; however, they are narrower than in beams without external reinforcement [12][13][14][15][16][17][18].…”

Kompozitinių plienbetoninių plokščių, armuotų plieniniu plaušu, savybių tyrimas

“…Dažnai profiliuotųjų lakštų skardoje daromi įvairios formos nelygumai (briaunelės), kurie didina mechaninį atsparumą praslysti (Burnet et al 2004;Motak et al 2004). Atramų zonoje gali būti įrengiama specialių inkarų.…”

Analysis of Behaviour of Contact Between the Profiled Steel Sheeting and the Concrete

“…Rigidity of contact between profiled sheeting and concrete is very important for an effective action of composite steel-concrete slabs [10][11][12][13][14]. Composite action of layers can be achieved by a reduction of slip between concrete and steel sheeting in the plane of contact [15][16][17][18]. Contact strength and deformability is determined by: chemical steel and concrete bond, mechanical strength of contact, friction between concrete, steel and anchors [19,20].…”