Abstract
An experimental research was carried out to investigate the seismic performance and shear strength of reactive powder concrete interior beam-column joints subjected to reverse cyclic loads. Four beam-column joint specimens were cast and tested in the investigation. The failure characteristics, deformational properties, ductility, and energy dissipation of reinforced reactive powder concrete interior beam-column joints were analyzed in this paper. The shear strength of joints was calculated according to the GB5001-2010 and ACI 318-14. The results shows that reactive powder concrete beam-column joints have a higher shear-cracking strength and shear carrying capacity and strength degradation and rigidity degradation are not notable. Additionally, the use of RPC for beam-column joints can reduce the congestion of stirrups in joints core. The shear force in the RPC joint is mainly carried by the diagonal strut mechanism; the design expression of ACI 318-14 can be used for calculating the shear strength of RPC joints, which has a safety margin of 22%∼38% in this test.
Highlights
Since the 1960s, the performance of reinforced concrete beamcolumn joints has been an active subject in the earthquake resistance of engineering structures, and the field has seen numerous achievements [1,2,3,4]
There has been extensive research conducted on Reactive powder concrete (RPC) in terms of the mix preparation and mechanical properties, and the results indicate that the mechanical properties of RPC are better than NC and HSC [15, 16]; in addition, studies on the mechanical behavior of the beams and columns has been carried out by Hung and Chueh [17], Malik and Foster [18], and Deng et al [19]
Studies have demonstrated that RPC structures di er signi cantly from normal and high-strength concrete structures because of the di erence of performances of RPC materials [21, 22]. is paper, based on the RPC beam-column joints quasistatic test, studies the seismic performance of RPC beam-column joints, investigates the in uence of the stirrup ratio and axial compression ratio on the seismic performance of RPC beam-column joints, studies the RPC joint forced destruction mechanism, and provides reference for the seismic design of RPC frame structure
Summary
Since the 1960s, the performance of reinforced concrete beamcolumn joints has been an active subject in the earthquake resistance of engineering structures, and the field has seen numerous achievements [1,2,3,4]. Splitting tensile failure and concrete cover spalling failure occur at the interface between concrete and bars For these reasons, some new design approaches were developed. Researches have demonstrated that the spacing of stirrups in the joint area can be decreased by using steel fiber-reinforced concrete instead of normal concrete [8,9,10]. Reactive powder concrete (RPC) is a new cement-based composite with ultrahigh strength and performance. Erefore, the mechanical properties and durability of frame structures can be improved by using reactive powder concrete with high strength and durability. Wang et al [20] presented the reported study on the seismic behavior of RPC exterior joints with high-strength bars. Studies have demonstrated that RPC structures di er signi cantly from normal and high-strength concrete structures because of the di erence of performances of RPC materials [21, 22]. is paper, based on the RPC beam-column joints quasistatic test, studies the seismic performance of RPC beam-column joints, investigates the in uence of the stirrup ratio and axial compression ratio on the seismic performance of RPC beam-column joints, studies the RPC joint forced destruction mechanism, and provides reference for the seismic design of RPC frame structure
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