Comparative Research On Structure Performance Of Large Span Suspension Bridge With Spatial Cable System

In recent years, with the increasing span of suspension bridge, the traditional wind-resistant stability of parallel cable system of suspension bridge is very prominent. To makes 4000m above Super big span of Strait suspension bridge meet anti-wind stability, this paper presents a novel hyperboloid of one sheet spatial suspension bridge, through model analysis and finite element analysis combined of method, the research on static and dynamic characteristics of hyperboloid of one sheet spatial suspension bridge, restrained style spatial suspension bridge and sparallel cable system of suspension bridge is conducted. This paper explores the new spatial suspension bridge on the mechanical properties of advantage. The main work and research results are as follows:The test model of hyperboloid of one sheet spatial suspension bridge, restrained style spatial suspension bridge and sparallel cable system of suspension bridge with 15m main span is made in this paper. In the vertical load test, the effect of gravity stiffness of hyperboloid of one sheet spatial suspension bridge is discussed, the tests show that the spatial suspension bridge cable substantially uniform distribution of the internal forces, the cable load increment substantially linear relationship, a strong ability to work together. In vertical partial load test, hyperboloid of one sheet spatial suspension bridge exhibits better resistance to deflection, indicating that it has greatly improved torsional stiffness. Static load level shows that due to the horizontal component of the cable and the cable space overall stiffness, this hyperboloid spatial cable system of suspension cable has a greater level of stiffness. By moving vehicle load experiment, the displacement-time curve moving loads deck girders and found spatial suspension bridge undulating serpentine smaller space show suspension has better driving comfort. In the vibration characteristics of the model tests, we find that, compared to the parallel cable suspension system, hyperboloid of one sheet spatial suspension bridge has a large vertical bending frequency and the frequency of scoliosis, which showed that the lateral stiffness and vertical stiffness is larger.In addition, the simulation analysis of the test model is made based on ANSYS, the calculated results agree well with the calculated results, and to carry out comparative analysis of three suspension bridges verify the hyperboloid of one sheet spatial suspension bridge having better spatial rigidity. Finite element contrast analysis show hyperboloid of one sheet spatial suspension bridge’s vertical stiffness increased slightly,lateral rigidity increased largely, and its torsional rigidity has been greatly improved, suggesting that the new spatial suspension bridge will have a good wind suspension stability.Establish a main span of 4000m suspension bridge finite element model of the three bridges.From the bridge under static and dynamic characteristics and wind-resistant stability, the comparative research of hyperboloid of one sheet spatial suspension bridge, restrained style spatial suspension bridge and sparallel cable system of suspension bridge is conducted.Research has shown that the spatial stiffness,dynamic and wind-resistant stability of hyperboloid of one sheet spatial suspension bridge is better than the other two type of suspension.The flutter critical wind speed of 4000m hyperboloid one sheet spatial suspension bridge can reach 167.61m/s to meet the design wind speed for suspension bridge of the straits request. And the establishment of 4000m CFRP cable system of spatial suspension bridge,analysis show that its dynamic characteristics and wind-resistant stability is better than steel cable spatial suspension bridge.