Abstract
This paper presents a nonlinear finite element analysis (FEA) of textiles reinforced mortars (TRM)-confined reinforced concrete (RC) columns through jacketing, under combined axial and cyclic loadings. The FEA models were validated with an experimental study in the literature that was conducted on full-scale square columns reinforced with continuous steel bars (no lap splices). Subsequently, parametric study was performed on the validated FEA models. The parameters considered include various jacket’s lengths and mortar strengths. Moreover, semiempirical models were developed to evaluate the plastic hinge length (LP) and the ultimate drift ratio of RC columns confined with TRM and FRP jackets, while considering the jacket length effect. The FEA models and experimental results were in good agreement. The finite element results revealed that the increase in the jacket length improved the lateral deformation capacity and increased the plastic hinge length linearly up to a confinement ratio of 0.2. Beyond this point, the plastic hinge length shortened as the confinement ratio raised. Moreover, mortars with higher flexural strength resulted in a slightly higher deformation capacity. However, the difference in the mortar compressive strength did not affect the ultimate lateral deformation capacity. The semiempirical models show that the average difference in the predicted LP and the ultimate drift ratio values as compared to the experimental and simulated columns was 3.19 and 16.06%, respectively.
Highlights
Reinforced concrete (RC) columns subjected to seismic loading should be designed properly to satisfy the deformation demands in performance-based design [1]
The results showed that as compared to Fiber reinforced polymer (FRP), textiles reinforced mortars (TRM) jackets were 50% more effective in increasing the cyclic deformation capacity and the energy dissipation in columns reinforced with continuous steel bars
finite element analysis (FEA) models of RC columns confined with TRM jackets under combined axial and lateral cyclic loadings were developed and validated with an experimental study in the literature [17], which was performed on full-scale square concrete col-umns reinforced with continuous steel bars
Summary
Reinforced concrete (RC) columns subjected to seismic loading should be designed properly to satisfy the deformation demands in performance-based design [1]. The results showed that as compared to FRP, TRM jackets were 50% more effective in increasing the cyclic deformation capacity and the energy dissipation in columns reinforced with continuous steel bars This behavior is at-tributed to the ability of TRM to resist local stresses that are due to the low composite action between the fibers and the mortar [15]. There are other significant parameters that have a direct relation to the lateral deformation capacity that have not been studied in RC columns confined with TRM and subjected to combined axial and lateral cyclic load-ings These parameters include various jacket lengths and mortar strengths. FEA models of RC columns confined with TRM jackets under combined axial and lateral cyclic loadings were developed and validated with an experimental study in the literature [17], which was performed on full-scale square concrete col-umns reinforced with continuous steel bars (no lap splices). Two formulas were proposed to predict the plastic hinge length and the ultimate drift ratio of RC columns confined with TRM and FRP jackets with vari-ous lengths that would be useful for the designers and practitioners
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