Study of Encased Composite Beams

Abstract

Study Of Encased Composite Beams Headed studs in two positions provided shear resistance between the I-shaped beam and the concrete: vertically welded on the bottom flange and horizontally welded on the web faces. These materials combine steel strength with compressive strength and concrete rigidity, producing a highly economical and interesting structural system.

Research on composite members is popular as they play a major role in high-rise buildings and bridges with aesthetically pleasing complex designs.A non-linear structural analysis of enclosed composite beams incorporating material non-linearity and geometric non-linearity is conducted to evaluate the flexural behavior and torsional behavior of composite beams.

In addition, lower construction costs compared to reinforced concrete (RC) or steel frame system. The beams showed highly ductile behaviour. Using linear elastic theory, the deflection at the beam’s mid-span can not be well predicted.

In addition to the well-known advantages of composite columns, partially enclosed composite columns offered simplified beam-to-column connection as well as reduced or omitted shuttering resulting in cost-effective construction.

The partially enclosed composite beam columns (PECBC) configuration described in this paper is a relatively recent development in composite structures consisting of thin walled, welded H-shaped steel section with concrete infill cast between the flanges.

In modern constructions, especially in multi-storey buildings, steel-concrete composite structures have been used more frequently. These materials combine steel strength with compressive strength and concrete stiffness, creating a highly economical and interesting structural system.

Conclusion

The proposed system’s ultimate strength exceeded the design value. It failed due to concrete crushing without bond or local failure in the compression zone. This behavior was consistent with the objective of the design, i.e. complete composite action before yield and partial composite action after yield. This design concept enabled the proposed system to develop sufficient ductility, strength and consequently effective composite behavior without causing serviceability issues.