JointCapacity

Joint Between CHS and CHS

Type of Failure

Joint Calssification

Principal Joint typology (N falls under T type) is listed below taking into account that Joint Classification is based on *force transfer between brace and chord more than on geometry*. Follow a summary of cases from Wardenier,

API Rules

The same classification is picked up by API rules

Joint Type Classification	Factored Loads

Ultimate Punching Shear failure Resistance

Considering a punching shear failure mechanism the following ultimate capacity is determined by the API rules

Joint Type Classification	Design Resistance

Chord Stress Level

The term A, in the API procedures described above, introduces the stress level in the chord considering the values

• Axial stress \bar{\mathrm{f}}_{ax}
• in plane bending stress \bar{\mathrm{f}}_{ipb}
• out of plane bending stress \bar{\mathrm{f}}_{opb}

an increase in bending stiffness in the chord, thanks to Gusset Plate, decrease the stress level in the chord

Joint Between CHS and Plates or RHS or I Section

Applicable Standard are AISC "Standard Specification for Structural Steel Buildings" Chapter K. Reference is found in [2] at pag. 67.

Joint Type for CHS to I Section/Plate	Qu Values

Gusset Plate Joint

Gusset Plate Circumferential failure

Failure	Limit Load

Gusset Plate Tear-Out

Failure	Limit Load

REFERENCE

[1] J. Wardenier, Y. Kurobane, J.A. Packer, G.J. van der Vegte and X.-L. Zhao DESIGN GUIDE FOR CIRCULAR HOLLOW SECTION (CHS) JOINTS UNDER PREDOMINANTLY STATIC LOADING Second Edition

[2] Y. Kurobane, J. A. Packer, J. Wardenier, N. Yeomans, DESIGN GUIDE FOR STRUCTURAL HOLLOW SECTION COLUMN CONNECTIONS

-- RobertoBernetti - 02 Aug 2012