Essential Features of Link

Depending upon its length, the link may dissipate seismic energy either by developing plastic hinges or by yielding of the web in shear. Links longer than twice their depths tend to develop plastic hinges whereas shorter links tend to yield in shear. Thus, the links can be identified either as short or long, with the former experiencing moderate rotations and the latter, relatively larger rotations.

The shear yielding is an excellent energy dissipation mechanism because large cyclic deflections can take place without failure or deterioration of the link. This is because yielding occurs over a large segment of the beam web and is followed by a cyclic diagonal field.

Figure 3.14. Eccentric bracing system: (a-d) common types of bracing; (e) elevation; (f) detail.

Figure 3.14. Eccentric bracing system: (a-d) common types of bracing; (e) elevation; (f) detail.

The web buckles after yielding in shear, but the tension field takes over the load-carrying mechanism to prevent failure, resulting in good energy dissipation. Thus the link may bend and twist, but will not lose its gravity load-carrying capacity.

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