Stiffness Decay and Damping Ratios of Steel Fiber Reinforced Concrete Walls


Abstract eng:
The stiffness degradation and damping ratio characteristics of low-rise steel fiber-reinforced concrete (SFRC) walls subjected to shake table excitations is presented in this paper. Three fiber volume contents (0.55, 0.75, and 1 %) and fibers with aspect ratios (length-to-diameter ratio) of 64 and 80 were used to fabricate six SFRC walls. The results of two conventionally reinforced concrete (RC) walls are included as a benchmark. Wall performance is presented in terms of observed failure modes, measured lateral drift components, fundamental frequencies, damping factors, and stiffness decay relationships. The data show that larger drift ratios can be achieved as the fiber content increased, irrespective of the fiber type, and that fibers with a higher aspect ratio led to a greater number, smaller crack widths. Stiffness reductions in the order of 50% were observed for the SFRC walls at relatively small lateral drifts (0.1 to 0.2%). Nonetheless, SFRC walls showed smaller stiffness reductions than the companion RC walls over the entire range of drifts. Measured damping ratios for the SFRC walls showed wide scatter, but ranged between 6% at low drifts and as high as 12% after diagonal cracking at larger drifts. The conventionally reinforced concrete walls showed similar values at low drifts, but somewhat less values (10%) at larger drifts.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3098.:
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