000018845 001__ 18845
000018845 005__ 20170118182244.0
000018845 04107 $$aeng
000018845 046__ $$k2017-01-09
000018845 100__ $$aGhannoum, Wassim
000018845 24500 $$aPlasticity Spread in Columns Reinforced With High-Strength Steel

000018845 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018845 260__ $$b
000018845 506__ $$arestricted
000018845 520__ $$2eng$$aThe demand for higher strength reinforcing steel in concrete construction is rapidly increasing in the United States and worldwide. Economic, environmental, and contractibility incentives are fueling the demand, particularly in highly congested seismic designs. Nevertheless, current code limits on the strength of reinforcing steel in the U.S, combined with a lack of understanding of the effects of higher strength steel on the performance of concrete members, are hindering progress in structural designs. Steel grades higher than Grade 80 (80 ksi specified yield strength [540 MPa]) and having relatively high ductility (>10% fracture strains) are just emerging in the U.S. However, the steel industry is producing the high-strength steels with varying mechanical properties. Test results are presented from an experimental program carried at the University of Texas at Austin aimed at evaluating the effect of the tensile-to-yield (T/Y) strength ratio of high-strength reinforcement on the plasticity spread in concrete columns subjected to seismic demands. Comparisons are made between the performances of columns reinforced with various grade bars including Grade 100 bars (100 ksi specified yield strength [690 MPa]) produced using the leading production techniques in the U.S. and having different T/Y strength ratios. These tests were conducted as part of a research effort aimed at setting the minimum acceptable T/Y ratio in new ASTM specifications for seismic Grades 80 and 100 reinforcement. Column specimens were tested under constant axial load and reverse cyclic lateral loading until significant loss in lateral load carrying capacity. Conclusions are drawn with respect to the effects of higher strength reinforcement on the seismic performance of concrete columns and strain demands on reinforcing bars.

000018845 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018845 653__ $$areinforced concrete; high strength steel; seismic; shear; columns

000018845 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018845 720__ $$aGhannoum, Wassim$$iSokoli, Drit$$iLimantono, Albert
000018845 8560_ $$ffischerc@itam.cas.cz
000018845 8564_ $$s1706421$$uhttps://invenio.itam.cas.cz/record/18845/files/234.pdf$$yOriginal version of the author's contribution as presented on USB, paper 234.
000018845 962__ $$r16048
000018845 980__ $$aPAPER