Clevis Joint Check (Eurocode 3)
Perform a quick and complete clevis joint check following Eurocode 3.
Parameters explained
Parameter name | Symbol | Unit | Info text |
---|---|---|---|
Design ultimate load | FEd | kN | The total design axial load applied to the clevis joint for Ultimate Limit State (ULS) checks. |
Design serviceability load | FEd,ser | kN | The design axial load applied to the clevis joint for Serviceability Limit State (SLS) checks, used to prevent excessive deformation or hole ovalization. |
Replaceable pin | Choice | - | Indicates if the pin is designed to be replaceable. If so, then SLS checks are also performed. |
Pin diameter | d | mm | The nominal diameter of the cylindrical pin that connects the plates. |
Gap | g | mm | The spacing or gap between a middle plate (tongue) and an outer plate (clevis arm). This dimension significantly influences the bending moment in the pin. |
Pin yield stress | fy,p | N/mm² | Yield strength of the material from which the pin is made. |
Pin ultimate tensile stress | fu,p | N/mm² | Ultimate tensile strength of the pin material. |
Plate yield stress | fy,M, fy,O | N/mm² | Yield strength of the material for the middle (M) plate (tongue) and outer (O) plates (clevis arms). |
Plate hole diameter | d0,M, d0,O | mm | Diameter of the pin hole in the middle (M) and outer (O) plates. Typically slightly larger than the pin diameter 'd'. |
Plate thickness | tM, tO | mm | Thickness of the middle (M) plate and outer (O) plates. |
Plate side length | cM, cO | mm | Distance from the edge of the pin hole to the side edge of the middle (M) and outer (O) plates (perpendicular to force direction). |
Plate front length | aM, aO | mm | Distance from the edge of the pin hole to the front edge of the middle (M) and outer (O) plates (in line with force direction). |
Plate end radius | RM, RO | mm | Radius of the profiled end of the middle (M) and outer (O) plates. Important for preventing certain failure modes. |
Partial safety factor (yielding) | γM0 | - | Partial safety factor for resistance of cross-sections (e.g., pin bending). Typically 1.0 or 1.1 for steel structures as per Eurocode. |
Partial safety factor (connections) | γM2 | - | Partial safety factor for resistance of connections, including pins (shear, bearing). Typically 1.25 as per Eurocode. |
Partial safety factor (serviceability) | γM6,ser | - | Partial safety factor used for serviceability limit state checks of pins, often related to bearing for replaceable pins. Typically 1.0 as per Eurocode. |
Young's modulus | E | N/mm² | Modulus of elasticity for the steel material (e.g., 210,000 N/mm² for steel). |
Unity check | UC | - | The ratio of the calculated design value to the design limit. A value less than or equal to 1.0 indicates that the weld design is acceptable under the given loads. |
Shear check | Verifies pin against shear failure. Compares design shear force (Fv,Ed) to shear resistance (Fv,Rd). Fv,Rd considers single or double shear planes and pin's ultimate strength (fu,p). | ||
Bending check | Verifies pin against bending failure. Compares design bending moment (MEd), influenced by gap 'g', to bending resistance (MRd) based on pin's yield strength (fy,p). | ||
Bearing check | Verifies the plates and/or pin against bearing failure/stress at the pin hole, comparing applied force/stress to bearing resistance. | ||
Plate geometry check | Checks if the provided front edge distance or side edge distance for the plate meets minimum Eurocode geometry requirements. | ||
Contact stress check (SLS) | Verifies contact stress between the pin and the plate under serviceability loads against allowable limits. |