Abstract
The elastic modulus and deadweight of carbon fiber-reinforced polymer (CFRP) cables are different from those of steel cables. Thus, the static and dynamic behaviors of cable-stayed bridges using CFRP cables are different from those of cable-stayed bridges using steel cables. The static and dynamic performances of the two kinds of bridges with a span of 1000 m were studied using the numerical method. The effects of geometric nonlinear factors on static performance of the two kinds of cable-stayed bridges were analyzed. The live load effects and temperature effects of the two cable-stayed bridges were also analyzed. The influences of design parameters, including different structural systems, the numbers of auxiliary piers, and the space arrangement types of cable, on the dynamic performance of the cable-stayed bridge using CFRP cables were also studied. Results demonstrate that sag effect of the CFRP cable is much smaller than that of steel cable. The temperature effects of CFRP cable-stayed bridge are less than those of steel cable-stayed bridge. The vertical bending natural vibration frequency of the CFRP cable-stayed bridge is generally lower than that of steel cable-stayed bridge, whereas the torsional natural vibration frequency of the former is higher than that of the latter.
Highlights
Given their large spanning ability, elegant appearance, and good aerodynamic stability, cable-stayed bridges have experienced a prosperous development in the last 30 years and are still regarded as the first choice to cross rivers, valleys, and even straits
Comparing the results between Sag Effect Analysis (SE) and Initial Stress Analysis (IS), it is found that displacements and bending moments of the cable-stayed bridges using Carbon fiber-reinforced polymers (CFRP) cables exhibit a little difference, whereas the displacements and bending moments at the midspan of the steel cable-stayed bridge increase by 7.5% and 4.4%, respectively, when the sag effect is taken into account, indicating that CFRP cable displays a smaller sag effect than steel cable
Comparing the results of the two cable-stayed bridges, most structural effects of CFRP cable-stayed bridges are greater than those of steel cable-stayed bridges, except for the axial force of the main girder at the pylon. This is because the elastic modulus of the CFRP cable is 20% less than that of steel cable, but the former is 8% less than the latter after considering the sag effect
Summary
Given their large spanning ability, elegant appearance, and good aerodynamic stability, cable-stayed bridges have experienced a prosperous development in the last 30 years and are still regarded as the first choice to cross rivers, valleys, and even straits. Carbon fiber-reinforced polymers (CFRP) possess many advantages, including light weight, high tensile strength, and excellent corrosion and fatigue resistance These properties of CFRP make them very attractive in superspan cable-stayed bridges. A few scholars have studied the static and dynamic performances, as well as wind and seismic performances, of cable-stayed bridges using CFRP cables. Xie et al [18, 19] explained the static and dynamic characteristics of a long-span cable-stayed bridge with CFRP cables. The cable-stayed bridges using CFRP and steel cables, respectively, with the same span arrangement were designed. The effects of geometric nonlinearity on the static performance of two cable-stayed bridges were studied. Several scholars studied the dynamic characteristics of cable-stayed bridges using CFRP cables before, their research only focused on a special example. Rational design parameters are optimized, providing reference for the design of cable-stayed bridges using CFRP cables
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