Abstract
Seismic performance of cross-shaped columns with 500 MPa grade reinforcing steel bars
Highlights
The use of high-strength reinforcement in concrete columns was first considered in the early 1930s [15] in a series of laboratory tests on columns with circular cross sections and spiral reinforcement, and the effect of high strength steel with yield strength up to 665 MPa was studied
Several researches have shown that the application of the high-strength reinforcing steel bars will reduce the ductility of the specimens, but ductile flexural failure appears for three specimens in this paper which proves that the application of high-strength reinforcing steel bars will not cause brittle failure
400 MPa is selected as the yield strength of 400 MPa grade reinforcing steel bar, and 540 MPa is selected as the ultimate strength; 500 MPa is selected as the yield strength of 500 MPa grade reinforcing steel bar, and 630
Summary
The use of high-strength reinforcement in concrete columns was first considered in the early 1930s [15] in a series of laboratory tests on columns with circular cross sections and spiral reinforcement, and the effect of high strength steel with yield strength up to 665 MPa was studied. The experimental work at PCA laboratories in the 1960s led to a series of reports titled "High-strength bars as concrete reinforcement", where concrete members reinforced with high strength steel with yield strength up to 828 MPa were studied [4, 7, 13, 14] Those experimental investigations focused on members under axial compression without or with small eccentricities, in which the longitudinal reinforcement was totally in compression. Seismic performance of cross-shaped columns with 500 MPa grade reinforcing steel bars. The high-strength steel bars are defined here as steel bars with nominal yield stress larger than 500 MPa. Three cross-shaped column specimens are designed in this test. The failure mode is a typical flexural failure for each specimen, which is controlled by crushing of the concrete at the plastic zone near the bottom of the column. Several researches have shown that the application of the high-strength reinforcing steel bars will reduce the ductility of the specimens, but ductile flexural failure appears for three specimens in this paper which proves that the application of high-strength reinforcing steel bars will not cause brittle failure (the concrete crushes before the yield of the reinforcing steel bars)
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