Experimental and Numerical Nonlinear Analysis of Hollow RC Beams Reinforced with Rectangular Spiral Stirrups under Torsion
Tóm tắt
Nonlinear finite element analysis plays an important role in extending experimental programs’ testing parameters and also in saving the costs of conducting these programs. Thus, nonlinear finite element analysis using ANSYS V-15.0 software had been carried out to emphasize the effect of inclined spiral stirrups having different inclination angles (θ) and pitches (P) to enhance the torsional strength of hollow reinforced concrete (RC) beams. The analysis was performed to extend the authors’ experimental work that consisted of seven normal-strength RC hollow beams reinforced by rectangular spirals with different ratios. Experimentally, various parameters were considered such as spiral stirrups ratio (
$$\rho_{st}$$
), pitch (P), stirrups inclination angle (θ), and the longitudinal RFT ratio (
$$\rho_{sl}$$
). Numerically, the considered parameters were the same as the experimental parameters and the concrete strength (
$${\varvec{f}}_{{{\varvec{cu}}}} )$$
was added as a new parameter. Also, a numerical equation had been developed to find out the torsional capacity of such beams. Based on the obtained theoretical results, it was found that the proper simulation of the test material properties, loading and boundary condition led to predict the torsional behavior of the considered beams accurately. In addition, the comparison between the numerical and experimental results was most satisfactory and the proposed equation greatly correlates with the experimental and the numerical results.
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