Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Abstract

Based on a practical project, the construction method of circular reinforced concrete (RC) columns strengthened with externally wrapped steel plates was introduced in this paper. In order to study the bearing capacity and seismic performance of circular RC columns after strengthening, a formula for calculating the bearing capacity of circular RC columns strengthened with externally wrapped steel plates was derived, with reference to the Code for Design of Strengthening Concrete Structure. Through ABAQUS software, the vertical monotone static loading analysis and the horizontal low-cyclic reversed loading analysis were carried out, respectively, before and after the strengthening of the full-size RC columns in this project. The results showed that the bearing capacity of the normal section of the RC column after strengthening was about 80% higher than that before strengthening, and the results of FEM software were in accord with the calculation results of theoretical formula to some degree. Under horizontal low-cyclic reversed loading, the columns after strengthening had both plumper hysteresis curves and higher ductility factors and equivalent viscous damping coefficient than those before strengthening, indicating the energy dissipation capacity, plastic deformation capacity, and seismic performance of the RC columns after strengthening were all obviously improved.

Experimental study on seismic behavior of RC beams confined by corroded stirrups

“…Compared with the RC1 specimen with uncorroded, the energy dissipation of RC2 (10.3% corrosion level) and RC3 (19.2% corrosion level) specimens at ultimate load stage decreased by 6.7 and 26.1%, respectively. Moreover, equivalent viscous damping coefficient, as another energy dissipation parameter, is used to evaluate the energy dissipation capacities of the specimens (Zhou et al ., 2019). The equivalent viscous damping coefficient can be calculated by Equation (5).Where SABCD is the measured area of the hysteresis loop ABCD ; S ΔOBE and S ΔODF are the idealized elastic-plastic areas of triangle OBE and ODF , respectively, as shown in Figure 15 (Zheng et al ., 2020).…”

Behaviour of Structural Elements Constructed and Rehabilitated With High Performance Concretes

“…Partially use of steel jacket and concrete-filled steel tube (DFST) to enhance the strength and improve the deformability of concrete columns was previously studied Lachemi et al 2006;Wang et al 2020;Xiao and Wu 2003). RC columns wrapped externally with steel tubes shown high compressive bearing capacity with high shear and flexural bearing capacity which can effectively prevent the brittle failure of the column with higher deformability and substantially improved the ductility (Lu et al 2019;Olmos et al 2019;Zhou et al 2019). However, in the steel jacketing method bolts or epoxy adhesives are needed to have sufficient bonding between the steel jacket layer and RC core column.…”

Behaviour of Structural Elements Constructed and Rehabilitated With High Performance Concretes

“…Partially use of steel jacket and concrete-filled steel tube (DFST) to enhance the strength and improve the deformability of concrete columns was previously studied Lachemi et al 2006;Wang et al 2020;Xiao and Wu 2003). RC columns wrapped externally with steel tubes shown high compressive bearing capacity with high shear and flexural bearing capacity which can effectively prevent the brittle failure of the column with higher deformability and substantially improved the ductility (Lu et al 2019;Olmos et al 2019;Zhou et al 2019). However, in the steel jacketing method bolts or epoxy adhesives are needed to have sufficient bonding between the steel jacket layer and RC core column.…”