Energy dissipation and damage on the interface of steel and steel fiber‐reinforced concrete composite column
The Structural Design of Tall and Special Buildings(2022)
Abstract
To address the problems faced with steel-reinforced concrete (SRC) in construction, such as positional conflicts between steel and steel bars or difficulty in pouring concrete, a novel "Steel and Steel Fiber-Reinforced Concrete" (SSFRC) composite structure was proposed. Push-out tests of 34 SSFRC composite columns were carried out in this paper to study the interfacial bond performance from the perspective of energy dissipation. Based on loading-displacement (P-D) curves, the interfacial energy dissipation (W-b) and energy dissipation factor (lambda) were introduced, and the influence of embedded length (L-e), steel fiber volume rate (rho(sf)), thickness of concrete cover (C-ss), and section type on W-b and lambda were analyzed. Test results indicated that circular column is better than square column in terms of W-b and lambda. The increase of L-e, C-ss, or rho(sf) is beneficial to the improvement of W-b, and lambda is positively correlated with rho(sf) and C-ss but negatively correlated with L-e. Additionally, the interfacial damage (D-a) was defined by the relationship between elastic deformation energy (W-a) and W-b. It can be concluded that the ascent of L-e and C-ss can effectively delay the appearance of D-a and inhibit the development of D-a, respectively, and D-a develops slowly with the increase of rho(sf) at the later loading stage.
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Key words
interfacial bond behavior, interfacial damage, interfacial energy dissipation, push-out test, steel fiber-reinforced concrete, steel reinforced concrete
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