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Beam to beam single plate welded connection

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1. Design requirement

2. Design procedure

3. Related Code in AISC 13th ed Specifications.

   3.1. Shear Strength of fillet weld

   3.2 Shear strength of connection element 

   3.3 Minimum size of fillet welds

   3.4 Maximum size of fillet welds

4. LRFD design example

5. ASD design example

1. Design requirement:

LRFD (Load and Resistance Factor) design:

LRFD design:

1. R_u £ fR_n.

Where R_u is factored shear force calculated based on strength design provision of building code.  R_n is nominal shear strength calculated based on AISC 13th ed, f is resistance factor.

ASD (Allowable Stress ) design:

1. R £ R_n/W.

Where R is service load force calculated based on allowable stress design provision of building code, R_n is  normal shear strength calculated based on AISC 13th edition, W = is safety factor.

2. Design procedure:

1. Check shear strength of beam web

2. Check shear strength of weld plate.

3. Design weld size and length between weld plate to connecting beam.

7. Determine weld size and length between weld plate to supporting beam.

3. Related Code in AISC 13th ed Specifications.

3.1. Shear Strength of fillet weld

Resistance factor: f = 0.75 (LRFD)

Safety factor: W = 2.0 (ASD)

Nominal Shear strength

R_n = F_w A_w

Where A_w is effective area of weld.  

For fillet weld, A_w = Ö2/2 t_w L_w = 0.707 t_w L_w, t_w is weld size, L_w is length of weld.

F_w is normal strength of the weld metal per unit area, ksi as shown below from AISC 13th ed. TableJ2.5.

For fillet weld: F_w = 0.60 F_EXX

F_EXX is electrode classification number, ksi.

3.2 Shear strength of connection element  (AISC 13th ed. section J4.2)

Shear yielding of connection element (beam web and connection plate)

Resistance factor: f = 1.0 (LRFD)

Safety factor: W = 1.5 (ASD)

R_n = 0.6 F_y A_g

Where F_y is yield strength of material, Ag is gross area subject to shear.

3.3 Minimum size of fillet welds         (AISC 13th ed, Table J2.4)

3.4 Maximum size of fillet welds