Influence of Crossrib Configuration on Bond-Slip Behavior for High-Strength Reinforcement in Concrete
Sisi Chao
TL;DR
This study examines how crossrib spacing in high-strength steel rebar affects its bond behavior with concrete.
Contribution
The study introduces new insights into the minimal impact of increased crossrib spacing on bond strength and slip behavior of high-strength rebar.
Findings
A 30–50% increase in crossrib spacing had little effect on bond failure mode or bond strength.
Bond-slip curves for T63 and TB63 rebars were similar, with TB63 showing 1.3 to 1.5-fold higher peak slippage.
Existing bond-slip models and Chinese code calculations are applicable to both rebar types.
Abstract
In the present study, the mechanical properties of high-strength steel rebar with different crossrib spacing that affect the bond behavior between steel rebar and concrete is investigated. To reveal the effects of crossrib spacing on the bond behavior of 630 MPa high-strength steel rebar (T63) in concrete, 42 bonding specimens were designed using T63 rebars and T63 rebars with increased crossrib spacing (TB63). The bond properties of two kinds of steel rebar with concrete were investigated by pull-out test and the failure modes, bond strengths, relative slippages, and bond-slip curves were obtained. Based on analysis of bond-slip curves, the applicability of the existing bond-slip constitutive model to describe T63 and TB63 rebars was discussed. It was found that 30–50% increase in crossrib spacing had little effect on the bond failure mode and bond strength of T63 rebar. The bond-slip…
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Taxonomy
TopicsStructural Behavior of Reinforced Concrete · Concrete Corrosion and Durability · Structural Load-Bearing Analysis