Behavior of Long Links in Eccentrically Braced Frames - Engelhardt, M D; Popov, E P

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Engelhardt, Michael D.; Popov, Egor P. - Behavior of Long Links in Eccentrically Braced Frames

Author: Engelhardt, Michael D.; Popov, Egor P. | Size: 59.6 MB | Format: PDF | Quality: Scanner | Publisher: UNIVERSITY OF CALIFORNIA AT BERKELEY | Year: 1989 | pages: 414

This report describes an experimental investigation and associated studies on the behavior of long, flexural yielding links in seismic-resistant Eaentrically Braced Frames (EBFs). EBFs provide ductile behavior under severe earthquake loads by restricting yielding to beam segments called "links". Short, shear yielding links are preferred because of their demonstrated excellent plastic rotation and energy dissipation capacities. Longer, flexural yielding links, however, can offer important architectural advantages and have been used on a number of recently constructed EBFs. Little experimental data has been available on the behavior of long links under cyclic loading.
The central focus of this report is an experimental investigation on fourteen 213 scale subassemblages subject to cyclic loads. The subassemblages model a portion of a single-diagonal EBF with the rinks attached to the columns. 'The testing program showed that the dominant failure mode for long links attached to columns is fracture of the link flange at the link-to-column connection. Rased on this experimental program, the recommendation is made that long links attached to columns not be used in EBFs. The test results suggest, however, that long links located between two braces can provide acceptable perfamance, although short Iinks are still preferred for best overall performance.
Because of the very high axial force and bending moment typically carried by the beam segment outside of the link, this member can buckle before link inelastic rotation is fullydeveloped, with a consequent loss in the overall system perfomance. Problems with the beam can be avoided by adhering to capacity design principles. A preliminary design procedure based on capacity design concepts is developed for the beams and braces of an EBF.
Based on the findings of this investigation, combined with the results of previous EBF research, preliminary design recommendations are provided for the use of long links not attaclled to columns. Included are recommendations on the design yield strength, ultimate strength, plastic rotation capacity and stiffening requirements for long links. The testing program has also demonstrated the suitability of selected brace-to-link connection details for use in EBFs with long or short links.

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Behavior of Long Links in Eccentrically Braced Frames - Engelhardt, M D; Popov, E P

Author: Engelhardt, Michael D.; Popov, Egor P | Size: 59.8 MB | Format: PDF | Quality: Unspecified | Publisher: UNIVERSITY OF CALIFORNIA AT BERKELEY | Year: 1989 | pages: 414

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