Abstract
In this study, the scope of CFRP cables in cable-stayed bridges is studied by establishing a numerical model of a 1400-m span of the same. The mechanical properties and characteristics of CFRP stay cables and of a cable-stayed bridge with CFRP cables are here subjected to comprehensive analysis. The anomalies in the damping properties of free vibration, nonlinear parametric vibration and wind fluctuating vibration between steel cables and CFRP cables are determined. The structural stiffness, wind resistance and traffic vibration of the cable-stayed bridge with CFRP cables are also analyzed. It was found that the static performances of a cable-stayed bridge with CFRP cables and steel cables are basically the same. The natural frequencies of CFRP cables do not coincide with the major natural frequencies of the cable-stayed bridge, so the likelihood of CFRP cable-bridge coupling vibration is minuscule. For CFRP cables, the response amplitudes of both parametric vibration and wind fluctuating vibration are smaller than those of steel cables. It can be concluded from the research that the use of CFRP cables does not change the dynamic characteristics of the vehicle-bridge coupling vibration. Therefore, they can be used in long-span cable-stayed bridges with an excellent mechanical performance.
Highlights
Cable-supported bridges have undergone rapid development over the last century since high-strength steel cables were first made available
Cable-stayed bridge is compared to a steel cable-stayed bridge with respect to material, element and structural characteristics. These results provide evidence supporting the use of Carbon fiber-reinforced plastic (CFRP) cables in long-span cable-stayed bridges
The results show that, due to the large self-weight, the natural frequencies of steel cables are about 0.5-times those of CFRP cables
Summary
Cable-supported bridges have undergone rapid development over the last century since high-strength steel cables were first made available. The possibility of using CFRP in long-span bridges has received considerable attention for this reason. Meier et al [2] evaluated the applicability of CFRP materials in long-span cable-supported bridges. The mechanical properties of long-span cable-supported bridges built with CFRP cables have been gradually explained. The impact of CFRP cables on the mechanical properties of long-span cable-stayed bridges has not yet been subjected to systematic research. A CFRP cable-stayed bridge is compared to a steel cable-stayed bridge with respect to material, element and structural characteristics. These results provide evidence supporting the use of CFRP cables in long-span cable-stayed bridges
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