Abstract
The dynamic characteristics are closely linked to the seismic stability and wind-resistant of the bridge. But different bridge types have different dynamic characteristics. In order to study the dynamic characteristics of a double-pylon cable-stayed bridge with a single-cable plane and steel truss girder whose main span is the longest in the world, the dynamic load test was done, and the finite element and the subspace iteration methods were used to analyze the vibration mode of the bridge. The influence of different structural parameters on the dynamic characteristics of the bridge was analyzed. The changed structural parameters are cable layout, stiffness of steel truss girder, stiffness of stayed cables, stiffness of pylons, the concentration of dead load, number and location of auxiliary piers, and structural system. The results show that the bending and torsion resistance of the double-pylon cable-stayed bridge with a single-cable plane and steel truss girder is weak. The torsional stiffness of the cable-stayed bridge with a double-cable plane is stronger than that of the cable-stayed bridge with a single-cable plane. The seismic stability and wind-resistant of the bridge can be improved by using light dead load, improving the stiffness of pylon and girder, and adding auxiliary piers scientifically. However, the change of cable stiffness has a complex influence on the dynamic characteristics of the bridge. The conclusion can offer references for the construction, maintenance, and design of the same type of bridges.
Highlights
Nowadays, more and more beautiful bridges are being built
Modern bridges, which are functional works of art, need to withstand earthquakes, strong wind, and other natural disasters. e dynamic characteristics of the bridge are closely related to the seismic stability and wind-resistant of the bridge [1, 2]
Casalegno and Russo [26] studied the dynamic characteristics of the bridge using new material. e dynamic characteristics of many other bridges have been studied, including ordinary cable-stayed bridges, suspension bridges, and continuous rigid frame bridges [27,28,29,30,31,32,33,34,35,36,37]. ese studies mainly focus on the dynamic characteristics of widely used general bridges and new bridges. e studies of the dynamic characteristics of the widely used general bridges are helpful to the formulation of the code. e research on the dynamic characteristics of the new bridges can provide a reference for similar bridges to be built in the future. e double-pylon cable-stayed bridge with steel truss girder and a single-cable plane is a new type of bridge, and its dynamic characteristics are is worth research
Summary
More and more beautiful bridges are being built. A beautifully shaped bridge can become a landmark of a city or even a symbol of urban culture. e double-pylon cablestayed bridge with single-cable plane and steel truss girder has strong performance and a beautiful appearance. E structure of the double-pylon cable-stayed bridge with a single-cable plane and steel truss girder is complex and its dynamic characteristics are not clear. E double-pylon cable-stayed bridge with steel truss girder and a single-cable plane is a new type of bridge, and its dynamic characteristics are is worth research. There are few studies on the influence of different stayed cable surface arrangements, girder stiffness, cable stiffness, pylon stiffness, the concentration of the dead load, number of auxiliary piers, and structural system on the dynamic characteristics of the double-pylon cable-stayed bridge with a single-cable plane and steel truss girder. E influence of different stayed cable surface arrangements, girder stiffness, cable stiffness, pylon stiffness, the concentration of the dead load, number of auxiliary piers, and structural system on the dynamic characteristics of a double-pylon cable-stayed bridge with single-cable plane and steel truss girder was analyzed. A double-pylon cable-stayed bridge with a single-cable plane and steel truss girder was taken as an example. e dynamic load test was done to verify the FE model, and the finite element method was adopted. e influence of different stayed cable surface arrangements, girder stiffness, cable stiffness, pylon stiffness, the concentration of the dead load, number of auxiliary piers, and structural system on the dynamic characteristics of a double-pylon cable-stayed bridge with single-cable plane and steel truss girder was analyzed. e dynamic characteristics of the same type of long-span bridges are similar, so the conclusions of this paper can be referenced by similar bridges and be of universal significance. is paper is a supplement to the study of the dynamic characteristics of the double-pylon cable-stayed bridge with a single-cable plane and steel truss girder, which can offer references for the construction, maintenance, and design of the same type of bridges and offer some new ideas for the study of the dynamic characteristics of other types of bridge
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