Built-up column I section design & tensile test for fillet weld.

Brief introduction 

Due to site constraint we have to design built up columns instead of universal column, so the design of welding  must be consider the major axis bending moment. The axial force and shear force directly accountable with normal design procedures.

Design equation 

Horizontal shear per welding = (S x A x y) / ( 2 x Ix )
                                     
                                         A = Flange Area
                                         S = M / (D-t)   ; M - major bending moment , D - flange to flange depth ,
                                                                    t = flange thickness
                                         y = lever arm from center of gravity
                                        Ix = Moment of inertia about X axis









From the above equation we can find the required welding force per mm  length.

















Tensile test for fillet weld

The welding normally subjected to nondestructive testings, such as magnetic particle inspection , ultrasonic inspection. But the critical strength required section need to test for tensile strength. this testing method statement only provided in the AS/NZS 3679.2:1996 code.

Sample test result