Abstract
Steel fiber reinforced concrete (SFRC) is a novel material of concrete, which has a great potential to be used in practical engineering. Based on the finite element software Opensees, the main objective of this paper presented a numerical simulation method on investigating the seismic behavior of SFRC–beam-column joints (BCJs) through modifying the calculation method of joint shear and longitudinal reinforcement slip deformations. The feasibility and accuracy of the numerical modeling method were verified by comparing the computed results with experimental data in terms of the hysteresis curves, skeleton curves, feature points, energy dissipation, and stiffness degradation. And then, the influences of some key parameters on the seismic behavior of BCJs were investigated and discussed in detail. The parametric studies clearly illustrated that both adding the steel fiber and increasing the stirrup amount of joint core area could significantly improve the seismic behavior of BCJs. The axial compression ratio had limited influence on the seismic behavior of BCJs. Finally, based on the main factors (steel fiber volume ratio, stirrup amount, and axial compression ratio), a formula for predicting ultimate shear capacity is derived.
Highlights
In recent decades, the construction industry has developed rapidly, and a large number of buildings have adopted reinforced concrete frame structures
This paper aims to present a novel numerical simulation method for investigating the seismic behavior of Steel fiber reinforced concrete (SFRC)–beam-column joints (BCJs), based on the Opensees analysis software
A numerical simulation method on investigating the seismic behavior of SFRC–BCJs was proposed by modifying the calculation method of shear deformation in the core area of joint and bond–slip deformation of longitudinal reinforcement of beam
Summary
The construction industry has developed rapidly, and a large number of buildings have adopted reinforced concrete frame structures. Ashraf et al [7] revised the model of Alath et al [6] and adopted two kinds of inelastic rotating springs in the joint area to consider the influence of shear deformation of joints and bond-slip of longitudinal bars, respectively. The results showed that the joint model could well simulate the shear deformation of the joint area under cyclic loads and reflect the hysteretic performance of frame joints. Ganesan [44] discussed the influence of steel fiber content on the seismic performance of steel fiber reinforced concrete (SFRC) beam-column joints (BCJs) through a low cyclic loading test. Based on the above background, according to the mechanical characteristics of steel fiber reinforced concrete beam-column joints (hereafter called SFRC–BCJs), a suitable analysis model is proposed by using Opensees software (version 2.3.0), and the hysteretic behavior under low cyclic loading is analyzed. A formula for predicting ultimate shear capacity is derived, which is based on the steel fiber volume ratio, stirrup amount, and axial compression ratio
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