Abstract
Abstract This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Four specimens were conducted according to quasi-static compression methods to investigate the compressive behavior of the novel composite structures. The experimental results indicated that the specimen with 45° trapezoidal latticed webs showed the most excellent energy absorption ability, which was about 2.5 times of the structures with vertical latticed webs. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. Numerical analysis of the composite sandwich structures was carried out by using a nonlinear explicit finite element (FE) software ANSYS/LS-DYNA. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The results showed that the peak impact force of the composite anti-collision device with 45° trapezoidal latticed webs would be reduced by 17.3%, and the time duration will be prolonged by about 31.1%.
Highlights
This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°
The average crushing forces of TS-T-A45 and TS-T-A60 are 64.7 and 61.2 kN, respectively. Among these four proposed specimens, the average crushing force of three kinds of trapezoidal latticed webs (TS-T-A45, TS-T-A60 and TS-T-A75) is much higher than that of vertical latticed webs (TS-V), which would be helpful for stopping specimens TS-T-A45, TS-TA60 and TS-T-A75 from collapsing at the initial impact process when used as a material of the bumper system to protect the bridge from ship collision
The results show that after changing the cross section form of anti-collision device, the peak impact force of the composite anti-collision device of 45° trapezoidal lattice webs will be reduced by 17.3%, the time duration will be prolonged by about 31.1%, and the impact protection effect of the bridge pier will be better
Summary
Abstract: This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The traditional lattice-web reinforced composite sandwich structures as anti-collision devices had been applied to several bridges (Figure 1). The failure mode of the composite structures reinforced by the trapezoidal latticed web can be improved to prevent the sudden decrease of the bearing load and to extend the elastic stroke of the bearing capacity; the energy absorption characteristics can be enhanced
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