Study On Mechanical Performance And Construction Control Of Jiang Yu Shaped Super High Pylon

Cable-stayed bridges are becoming more and more popular among designers because of their beautiful linearity,economical material cost and large span capacity.In recent years,with the rapid development of cities,people's requirements for living environment are getting higher and higher.Cable-stayed bridge is no longer only a traffic function,in many cities,cable-stayed bridge with its unique shape and beautiful design as a landmark building for people to appreciate.In order to coordinate with the local culture and surrounding landscape,the shape of cable-stayed bridges often has local color,which makes the emergence of special-shaped pylons.Cable-stayed bridges with special-shaped pylons are not only different from those with conventional pylons in shape,but also complicated in structure and influenced by external factors compared with conventional pylon-stayed bridges.There are also some potential safety hazards in construction process.At present,there are few literatures about special-shaped cable towers,and a lot of research is needed.Taking Yanpingba Yangtze River Bridge in Yibin City as the engineering background and the cable tower as the river fish type,the main work and research contents of this paper are as follows:(1)Firstly,the development of cable-stayed bridges at home and abroad is introduced,and then some common pylon structure forms,structure composition and section forms are summarized.(2)The engineering background of Yanpingba Yangtze River Bridge is summarized.According to the engineering background,the MIDAS/CIVIL calculation model is established,and the bridge structure is checked by the calculation model.(3)The calculation and analysis of the cable tower under combined action are carried out.The stability of the cable tower and the deformation and stress of the cable tower under static wind load,temperature effect and concrete shrinkage and creep are analyzed.The stress characteristics of the cable tower under different load effects are obtained.(4)According to the construction of the lower crossbeam of the cable tower,three different construction schemes are put forward,and then three different construction schemes are systematically analyzed and compared,and combined with their respective construction characteristics,the most reasonable construction scheme is selected.(5)On the basis of theoretical analysis,the variation law of stress and displacement of key section of pylon is studied,and the alignment of pylon during construction is corrected by analyzing the results,so as to ensure the safety and rationality of construction.