Research On System Transformation And Tensions Identification Of Self-anchored Suspension Bridge With Steel-concrete Composite Girder

With the gradual progress the construction technology and the continuous development of China’s transportation construction of the bridge,self-anchored suspension bridge with its beautiful appearance and strong adaptability of terrain are increasingly appreciated by engineers,but because of its unique force structure and complex construction technology,it brings many difficulties to the builders of bridge.The key problems of the bridge type of construction control is the system transformation and tensions identification under the state of the bridge.With the help of large-scale commercial finite element analysis software as the operation platform and Guihua bridge in Shaoyang as the engineering background,the system transformation scheme of self-anchored suspension bridge is determined and the tensions identification,the work and research result are follows:(1)The development and characteristics of the self anchored suspension bridge,the current research status at home and abroad as well as the static calculation and cable force optimization methods are summarized.(2)With the help of the finite element software and the engineering example,the method of how to quickly determine the reasonable bridge state of the self anchored suspension bridge is described.(3)The tension principle of the sling of the self anchored suspension bridge is discussed in detail,which provides a theoretical basis for the determination of the system conversion scheme.(4)Through the idea of six kinds of suspender tension,two specific system transformation plans were determined,and the four basic principles of system transformation were compared and implemented.Practice proved that the final finished line alignment is consistent with the design status.(5)The basic principle of tensions identification of self-anchored suspension bridge is analyzed.Based on the cable vibration equation under three different boundary conditions,the tensions identification program is compiled to identify the cable force after completion,which is provided reference for monitoring tensions of similar bridges.