Abstract
Steel-concrete composite truss is characterized by such advantages: high stiffness, low height and construction costs. Moreover, it has promising application prospects. Since the interfacial load between concrete and steel is still indeterminate, experimental research and finite element analysis were carried out on two samples in scale of 1:3 models of composite truss joint models. A detailed account of the design philosophy, structural origin, loading procedure and test items followed. Test results showed that under design load, the joints were at elastic stage all along. Joints cracking load was twice as much as the design load. Their yield load was 3.2 times the design load and the ultimate load was 3.5 times the design load. The joints had a high safety factor which met the design requirements. The joints failing process was that cracks appeared on concrete first, and the web members yielded soon after, leading to joint yield. Now that both the concrete chord and the steel web members failed, there is no obvious increase in joint bearing capacity after joint yield. But the joints underwent severe deformation and possessed good ductility. For this reason, the joints could be applied in engineering practice.
Highlights
Introduction and objectiveSteel-concrete composite truss is a new type of structure developed in recent years
When the load is smaller than 3300 kN, strains of gauging points on tensile and compressive web members grow evenly, indicating that the web members are in elastic stage
When the load keeps increasing to 3500 kN, no failure is seen on both web members, but the strains of the gauging points increase quickly, indicating that the web members are in elasto-plastic stage
Summary
Steel-concrete composite truss is a new type of structure developed in recent years. Hino et al (1985) performed bending tests on steel–PSC beams and steel-reinforced concrete beams with three types of mechanical joints: anchor bars, studs, and bolts. He. Experimental Research on End Joint of Steel-Concrete Composite Truss combined compressive axial forces and cyclic bending moments. How to ensure that the shear is distributed between concrete and steel plate remains the key technical problem This plan features the PBLconnectors (Valente, Cruz 2004; Vianna et al 2009) bearing the shearing and bending moment. This innovative composite truss structure was initially used in China, which needs experimental and numerical analysis to fully understand
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