X

where:

7.2.2 Failure modes for hollow section connections

(1) The design joint resistances of connections between hollow sections and of connections between hollow sections and open sections, should be based on the following failure modes as applicable:

a) Chord face failure (plastic failure of the chord face) or chord plastification (plastic failure of the chord cross-section);

b) Chord side wall failure (or chord web failure) by yielding, crushing or instability (crippling or buckling of the chord side wall or chord web) under the compression brace member;

c) Chord shear failure;

d) Punching shear failure of a hollow section chord wall (crack initiation leading to rupture of the brace members from the chord member);

e) Brace failure with reduced effective width (cracking in the welds or in the brace members);

f) Local buckling failure of a brace member or of a hollow section chord member at the joint location.

NOTE: The phrases printed in boldface type in this list are used to describe the various failure modes in the tables of design resistances given in 7.4 to 7.6.

(2) Figure 7.2 illustrates failure modes (a) to (f) for joints between CHS brace and chord members.

(3) Figure 7.3 illustrates failure modes (a) to (f) for joints between RHS brace and chord members.

(4) Figure 7.4 illustrates failure modes (a) to (f) for joints between CHS or RHS brace members and I or H section chord members.

(5) Although the resistance of a joint with properly formed welds is generally higher under tension than under compression, the design resistance of the joint is generally based on the resistance of the brace in compression to avoid the possible excessive local deformation or reduced rotation capacity or deformation capacity which might otherwise occur.

Figure 7.2: Failure modes for joints between CHS members

Figure 7.3: Failure modes for joints between RHS brace members and RHS chord members

Figure 7.3: Failure modes for joints between RHS brace members and RHS chord members

Figure 7.4: Failure modes for joints between CHS or RHS brace members and I

or H section chord members

Figure 7.4: Failure modes for joints between CHS or RHS brace members and I

or H section chord members

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