Prediction of the seismic behavior of concrete beams strengthened with aluminum alloy bars and/or basalt fiber‐reinforced polymer bars

Abstract

This paper investigated the seismic performance of reinforced concrete (RC) beams strengthened with aluminum alloy (AA) rods and/or basalt fiber-reinforced polymer (BFRP) rods using the near-surface mounted (NSM) technique under a low-cycle reversed loading test. A numerical calculation procedure was presented based on the strain compatibility and static equilibrium principles for estimating the momentcurvature response of these strengthened beams. The bending deflection and shear deflection were determined by the curvature distribution and shear strain distribution along the beam length, respectively. The results showed that the strengthened beams experienced three failure modes: intermediate crack-induced debonding (ICD), critical diagonal crack (CDC) debonding, and concrete cover separation (CCS). Increasing the number of strengthening bars on each side significantly enhances the load-carrying capacity of the beams strengthened with either AA or BFRP bars. The predictive accuracy of the proposed methodology was evaluated by comparing the predicted load-carrying capacities and deflections to the test characteristic points. The proposed theoretical model provided good verification of the load-carrying capacities and deflections with high accuracy.

Surface Roughening of Irradiation-Activated Basalt Fiber through In Situ Growth of SiO2: Effects on Crystallization and Properties of PP Composites

“…As a relatively new type of continuous inorganic fiber, basalt fiber (BF) not only shows higher thermal and oxidation resistance than organic fibers and carbon fiber, but also possesses higher mechanical strength than that of glass fibers. Additionally, the BF is prepared by rapidly drawing the basalt melt through the platinum–rhodium alloy wire drawing leakage plate at 1450 °C~1500 °C [ 7 , 8 , 9 ], the production process of BF produces little waste and pollution, hence it is deemed as a green and environmentally friendly fiber [ 10 , 11 , 12 , 13 ]. After years of academic research, industrial investment and market promotion, BF has shown great potential in structural materials, construction materials, friction materials, shipbuilding materials, heat insulation materials, automotive industry, high-temperature filter fabrics and protection fields [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”