Title: Seismic Performance Characterization of Beams with High-Strength Reinforcement

Author(s): Duy V. To; Jack P. Moehle

Publication: CRC

Volume:

Issue:

Appears on pages(s):

Keywords: reinforce, beams, high-strength reinforcement, seismic

DOI:

Date: 12/1/2017

Abstract:
A laboratory test and analytical research program was undertaken to characterize the performance of reinforced concrete beams with high-strength reinforcement subjected to reversed cyclic lateral loading simulating earthquake effects. The beams are representative of beams used in special moment frames. Four beams were tested in the laboratory test investigation, one with A706 Grade 60 reinforcement, one with Grade 100 reinforcement having tensile-to-yield strength ratio (T/Y) of 1.18, one with Grade 100 reinforcement with T/Y = 1.30, and one with A1035 Grade 100 reinforcement. In each beam, the noted reinforcement grade was used for both longitudinal and transverse reinforcement. Overall, all beams achieved rotation capacity of at least 0.045 radians. The beams with A706 Grade 60 and Grade 100 (T/Y = 1.30) reinforcement failed by buckling of longitudinal bars over several hoop spacings. The other two beams with Grade 100 reinforcement failed by fracture of longitudinal bars at the maximum moment section. Strain gauges installed on longitudinal bars indicated that beams with higher T/Y achieved greater spread of plasticity compared to beams with lower T/Y.