اتصالات گسترده ای از ستون های داخلی که در معرض بارگذاری زلزله جانبی قرار دارند

اتصالات گسترده ای از ستون های داخلی که در معرض بارگذاری زلزله جانبی قرار دارند

Interior wide beam-column connections in existing RC frames subjected to lateral earthquake loading

سال نشر:

2009

نویسندگان:

Benavent Climent ،X Cahís ، M Vico

تعداد صفحه فارسی/انگلیسی:

-

20

کلمات کلیدی:

Wide beam,column, Existing frames, Transverse beam, Energy dissipation, Ductility A. Benavent,Climent ( B ) Department of Structural Mechanics, University of Granada, Edificio Politécnico, Gran

دانشگاه

University of Granada

نشریه

bulletin of earthquake engineering

چکیده مقاله

A b s t r a c t

The seismic performance of two RC interior wide beam-column connections representative of existing frames designed and detailed according to past construction practices in the moderate-seismicity Mediterranean area was investigated experimentally. The specimens were subjected to axial loads, moderate levels of gravity loading and cyclic displacements up to failure. The specimens exhibited a “strong column-weak beam” type of flexural yielding mechanism. The wide beams did not reach the expected capacities corresponding to the formation of a full-width plastic hinge. The wide-beam longitudinal bars exhibited significant slippage, and the transverse beams underwent severe torsion cracking and even failure; this caused severe pinching in the load versus displacement hysteretic loops and exacerbated the intrinsic flexibility of this type of connection. The average drift ratios at
first yielding of the wide beam longitudinal reinforcement and at failure were 2.7 and 4.5%  respectively. The displacement ductility ratio was about 2.8. The ultimate energy dissipation capacity of each specimen—obtained by dividing the total plastic strain energy by the product of the yield load and yield displacement—was approximately 9, which is about one fourth of the value recommended for providing adequate seismic performance. Finally, a simple
approach is suggested for prediction of the bending capacity of existing connections.

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