LIMITING SLENDERNESS RATIOS
- for members whose design is based on compressive force, the slenderness ratio preferably should not exceed 200
- for members whose designed is based on tensile force, the slenderness ratio preferably should not exceed 300
ALLOWABLE STRESSES
- for tension in structural steel in terms of gross area, 0.60Fy
- for tension in structural steel based on effective net area, 0.50Fu
- for tension on pin-connected members based on net area, 0.45Fy
- for tension on eyebars on the body area, 0.60Fy
- for flexural members with compact sections, Fb = 0.66Fy
- for flexural members with non-compact sections, Fb = 0.60Fy
PIN-CONNECTED MEMBERS
- minimum net area beyond the pinhole, parallel to the axis of the member, shall not be less than 2/3 of the net area across the pinhole
- width of the body of an eyebar shall not exceed 8 times its thickness
- pin diameter shall not be less than 7/8 times the eyebar width
- pinhole diameter shall be no more than 0.8mm greater than the pin diameter
SHEAR CONNECTORS
- shear connectors shall have at least 25mm of lateral concrete cover
- diameter of studs shall not be greater than 2½ times the thickness of the flange to which they are welded
- minimum center-to-center spacing of stud connectors shall be 6 diameters along the longitudinal axis and 4 diameters transverse to the longitudinal axis maximum center-to-center spacing of stud connectors shall not exceed 8 times the total slab thickness
WELDS
- weld access holes shall have a length from the toe of the weld preparation not less than 1½ times the thickness of the material in which the hole is made
- groove welds:
* effective area = effective length of the weld x effective throat thickness
* effective length = width of the part joined
* effective throat thickness of a complete-penetration groove weld = thickness of the thinner part joined
* minimum effective throat thickness of partial-penetration groove welds =
- 3mm (thicker part joined to 6mm inclusive)
- 5mm (thicker part joined over 6 to 12mm)
- 6mm (thicker part joined over 12 to 20mm)
- 8mm (thicker part joined over 20 to 38mm)
- 10mm (thicker part joined over 38 to 57mm)
- 12mm (thicker part joined over 57 to 150mm)
- 16mm (thicker part joined over 150mm)
* effective throat thickness of a flare groove weld =
- flare bevel groove, 5/16R
- flare V-groove, ½R
- fillet welds:
* effective area of fillet welds = effective length x effective throat thickness
* effective throat thickness of a fillet weld = shortest distance from the root of the joint to the face of the diagrammatic weld
* minimum size of fillet welds =
- 3mm (thicker part joined to 6mm inclusive)
- 5mm (thicker part joined over 6 to 12mm)
- 6mm (thicker part joined over 12 to 20mm)
- 8mm (thicker part joined over 20mm)
* maximum size of fillet welds along edges =
- not greater than the thickness of the material (material less than 6mm thick)
- not greater than the thickness of the material minus 1.6mm (material 6mm or more in thickness)
* minimum effective length of a fillet weld designed on the basis of strength shall not be less than 4 times its nominal size
* if greater than 4 times its nominal size, the size of the weld should not exceed ¼ its effective length
* effective length of any segment of intermittent fillet welding shall not be less than 4 times the weld size, with a minimum of 38mm
* in lap joints, minimum lap shall be 5 times the thickness of the thinner part joined, but not less than 25mm
* slide or end fillet welds terminating at ends or sides, respectively, of parts or members shall, wherever practicable, be returned continuously around the corners for a distance not less than 2 times the nominal size of the weld
- plug and slot welds:
* diameter of the hole for a plug weld shall not be less than the thickness of the part containing it plus 8mm, nor greater than the minimum diameter plus 3mm or 2¼ times the thickness of the weld
* minimum spacing of lines of slot welds in a direction transverse to their length shall be 4 times the width of the slot
* minimum center-to-center spacing in a longitudinal direction shall be 2 times the length of the slot
* length of the slot shall not exceed 10 times the thickness of the weld
* width of the slot shall not be less than the thickness of the part containing it plus 8mm, nor shall it be larger than 2¼ times the thickness of the weld
* thickness of plug or slot welds in material 16mm or less thick = thickness of the material
* thickness of plug or slot welds in material over 16mm thick = ½ the thickness of the material but not less than 16mm
FASTENERS
- distance between centers of standard, oversized or slotted fastener holes shall not be less than 2 2/3 times the nominal diameter of the fastener
- maximum distance from the center of any rivet or bolt to the nearest edge of parts in contact shall be 12 times the thickness of the connected part, but shall not exceed 150mm
CAMBER
- trusses of 24.4m or greater span generally shall be cambered for approximately the dead-load deflection
- crane girders of 22.9m or greater span generally shall be cambered for approximately the dead-load deflection plus ½ the live-load deflection
