Study Of Control Tensile Force The Suspension Cable And Seismic Analysis Of Self-anchored Suspension Bridge

The self-anchored suspension bridge have so many advantages, such as beautiful shape and adapt to many different topographic and geologic conditions,become more and more popular in engineering and rise a construction boom in recent years. Self-anchored suspension bridge have a obvious advantage that it is not need for the construction huge anchor system, which is a necessary part of the traditional suspension bridge. But at the same time, the cable anchored in the beam makes the force condition becomes more complicated. In this paper, we study the self-anchored suspension tensile process construction, conduct seismic analysis and damping analysis of the self-anchored suspension, and choose Huangshui River concrete self-anchored suspension bridge as engineering background. The main research work and results achieved:1. This article summarizes the tensile methods of self-anchored suspension bridge. On this basis, the Huangshui self-anchored suspension bridge,in the procress of construction, using batches tensioning method, and give the specific tensioned order and the tension value.2. Using the finite element software MIDAS,establish finite element model of the Huangshui River self-anchored suspension, and work out the simulation of the tensile process during construction. As the self-anchored suspension bridge beam construction in the bracket, we can choose the knockout of the main beam as a control target during tension. The material of stiffening girder is concrete, so we need to control the stress and linear of the main beam during tension. Through the model calculations, to achieve a reasonable control of the parameters of the construction process. Ensure such factors, cable shape, linear of main beam and the force of sling, consistent with the design value. It can be seen that the finite element method is able to well simulate the construction process of the bridge tensile process, which used to guide the on-site construction.3. Through the analysis of the variation of each parameter in the process of sling tension, we found that:for the self-anchored suspension bridge in the process of tensile process,the internal forces of the suspender has adjacent principle, The cable displacement with weak correlation principle. Therefore,we can make use of.two features to guide the sling tension sequence in the construction process and cable force adjustment.4. For the self-anchored suspension bridge, the junction of tower and beam using different connection, which have a huge impact on dynamic characteristics. In order to conduct a comprehensive understanding of the dynamic characteristics of the self-anchored suspension, we conduct comparative analysis of the dynamic characteristics of semi-floating system and the pier-beam system. 5. Using the response spectrum analysis method and time history analysis methods to conduct the seismic response analysis of the self-anchored suspension bridge,we can find: Seismic response analysis of concrete self-anchored suspension bridge, we input response spectrum curve and the ground motion time history curve in different directions to conduct seismic response analysis, can find that different directions of vibration generally won’t coupled. Through contrast the calculation results of the response spectrum analysis and time history analysis can be seen:the general rule is similar, and both results are similar and the results of the time history analysis are statistical significance. In a word, these seismic analysis methods can be used to work out the analysis of the seismic response.6. The article studies the damping effect of the viscous dampers in the self-anchored suspension bridge and the sensitivity of the relevant parameters of the viscous dampers。From the results of the analysis,we found:Viscous dampers efficiently dissipate the seismic energy in the structure,so that greatly reduce the internal forces and displacements of the structure under the seismic load.The parameter value of damper will impact on shock absorption, so the correct choice of the parameters of the damper has great significance.