Design of composite beam Acoording to BS5950–3.1-1990

BS5950-3.1-1990, which is titled “Structural Use of Steelwork in Buildings – Code of Practice for Design of Simple and Continuous Composite Beams,” provides guidelines for the design of composite beams. Here is an overview of the design process for composite beams according to BS5950-3.1-1990:

Material Properties:

Determine the properties of the steel section, such as yield strength, elastic modulus, and steel grade.
Determine the properties of the concrete, such as compressive strength and modulus of elasticity.
Design Loads:

Determine the design loads on the beam, including dead loads, imposed loads, and any other relevant loads.
Section Classification:

Classify the steel section based on its plastic or elastic moment capacities.
Check the adequacy of the steel section to resist the bending moment and shear forces.
Composite Action:

Calculate the effective flange width for the composite section.
Determine the degree of shear connection required between the steel beam and the concrete slab.
Calculate the composite section properties, such as the moment of inertia and effective section modulus.
Moment Capacity:

Calculate the moment capacity of the composite beam using the appropriate design method, such as the plastic or elastic design.
Check the ultimate limit state and serviceability limit state requirements.
Shear Capacity:

Check the shear capacity of the composite beam.
Determine the shear connectors’ spacing and capacity to ensure adequate shear transfer between the steel beam and the concrete slab.
Deflection:

Check the deflection of the composite beam under service loads.
Verify that the deflection limits specified in the design code are satisfied.
Fire Resistance:

Determine the fire resistance requirements for the composite beam.
Design the necessary fire protection measures, such as applied fire protection or intumescent coatings.
Connection Design:

Design the beam-to-column connections and other relevant connections according to the design code requirements.
Ensure proper transfer of forces and moments between the composite beam and supporting elements.