BS5950 Stud Shear Connectors

BC 1: 2008 Design Guide on Use of Alternative Steel Materials to BS 5950

This design guide serves as Singapore’s national code of practice for the use of alternative steel materials in design to the British Standard “BS 5950 Structural use of steelwork in building”, including those manufactured to British Standards. Steel materials not covered in BS 5950 by default shall be allowed with or without restrictions if they are in compliance with the provisions of this design guide.

The objective of this design guide is to ensure that only adequate (in terms of material performance) and reliable (in terms of quality assurance) steel materials, regardless of material standards to which the materials are manufactured to, are used in the design of structural steelworks to ensure public safety.

This design guide only gives provisions for structural design based on BS 5950, and therefore only serves as guidance at the design stage. It has been assumed in the drafting of this design guide that the execution of its provisions is entrusted to appropriately qualified persons, in compliance with appropriate execution standards to control materials, fabrication, and erection of steelwork.

As a code of practice, this design guide takes the form of guidance and recommendations. It should not be quoted as if it was a specification and particular care should be taken to ensure that claims of compliance are not misleading. Reference for additional design recommendations other than those given in this design guide shall be made to various parts of BS 5950.

This design guide does not purport to include all the necessary provisions of a contract. Users of this design guide are responsible for their correct application.

BS5950 stud shear connectors

In section 2.9, it covers headed stud shear connectors used in transmitting the longitudinal shear between concrete and steel in composite beams and slabs. The shank diameter shall be in the range of 10 mm to 25 mm. The head diameter shall be at least 1.5 times the shank diameter; whereas the head depth shall be at least 0.4 times the shank diameter.

Requirements for raw material

The stud shear connectors shall be made from mild steel or stainless steel.

Mechanical properties

Strength: The nominal tensile strength shall be at least 400N/mm2.

Ductility: The elongation after fracture on proportional gauge length shall be at least 14%.

Dimensional tolerances

As a minimum, dimensional tolerances shall be in accordance with the corresponding standards which the shear connectors are manufactured to.

How to compute the characteristic resistance of stud shear connectors?

The characteristic resistance of stud shear connectors shall be computed using the following equation.

Characteristic resistance:

where

a=≤1, for; 

h = overall as-welded height of stud shear connector;
d = shank diameter of stud shear connector;
fcu = cube compressive strength of concrete;
Ec = modulus of elasticity of concrete;
fu = tensile strength of stud shear connector, but not greater than 450 N/mm2.

Tensile strengths of British/European (BS EN), American (AWS), Japanese (JIS), Australian/New Zealand (AS/NZS) and Chinese (GB) stud shear connectors

Certified BS5950 shear stud connectors

*Stud diameter should be at least 15.9 mm.

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