Dynamic Characteristics And Finite Element Analysis Of Stayed-cable Wind And Rain Chain-Styled Coupling Reaction

In recently years, the Stay rope was applied more and more widespread as a large number of cable-stayed bridges were constructed. The bridge can easily vibrate under incentives of the wind, rain and other deck vibration, and vortex-induced resonance, wake galloping, such as wind and rain vibration will be produced for the pulled cable with a smaller component of the quality and very low damping. It threats durability of stay rope and the operation security of bridges and it has become one of the key issues to a large-span cable-stayed bridge that urgent need to address. So, it is great significant to the construction and maintenance of the cable-stayed bridge to study the vibration mechanism of stay rope.In this paper, a preliminary exploration and research of analysis theory of cable-stayed bridge on vibration of the wind and rain was made by the dynamic simulation analysis of the whole bridge under the combined effect of wind and dead load. Taking a typical single-tower cable-stayed bridge for the engineering background, a simulation analysis was carried out of the entire bridge under coupling of the wind, self-load and the most adverse car-load. According to cable stress-strain diagram, to cut disaster-chain and reduce vibration on the cable-stayed bridge itself, and simulate and contrast analysis of vibration reduction measures on the chain of the cable-stayed bridge was made through ANSYS finite element analysis. The results show that the corresponding measures are effective.To analyze this complex vibration process of the cable-stayed bridge under the wind load the finite element analysis must be made. The results of finite element analysis not only can be used to guide model test, and can be used to analyze parameters to make up for the inadequacy of model test. In this paper, the detailed response of stay rope of the typical single-tower cable-stayed bridge to incentives of the wind load was analyzed through ANSYS finite element software so that the distribution of strain and stress can be obtained. According to the stress-strain diagram measures for reducing vibration would be taken, and the parallel finite element analysis to the main measures was made to compare the strengths and weaknesses between the same measures on different location and different measures.The main job of this article as follows,1. To set up the entire bridge model and make the modal analysis under static load to obtain statistical data of the model analysis.2. To set up the finite element model under the common coupling of incentives of wind load and variety of dead load, combined with analysis of static loads modal data internal forces can be analyzed.3. To make the comparative analysis on the above-mentioned stress-strain diagram of three reducing vibration measures at the same load.4. To make the comparison of advantages and disadvantages on analysis results of reducing vibration measures. This paper has a certain reference value, because it gave some specific measures on reducing vibration under the role of wind and rain through analysis and provided the basis for design, construction and monitoring of a similar cable-stayed bridge.