Study On Key Technologies Of A Cable-stayed With Cantilever Used For Experiment Platform Outside

Today,with new structures emerging,forms and forces of structures tend to be complicated and cantilevered structure and cable-stayed structure of them have developed rapidly.In this paper,the form studied are two kinds of flexible structures' combination about cable-stayed structure and cantilevered structure.It is an open experimental platform and the accuracy of structure's displacement is demanding,but for a flexible structure,it is difficult to control the accuracy of displacement.The displacement of experiment platform structure is not just about construction safety and proper use of the structure,but also determining whether it is necessary to adjust the orbit of the structure in the course of experiments.So the construction and using of the structure and the control of displacement's precision about structure are the main line of this paper.Temperature is the main clues and deformable structure must be considered because of the change of temperature during the construction and running of structure.This paper uses ABAQUS software to establish the approximate force state model to simulate the actual structures,and mainly analyze a number of key technologies on the experimental platform's construction and using.The following conclusions:(1)Structural construction is safe and reasonable.Tower,main beam,cantilevered section and cable-stayed achieve a reasonable bridge state and internal forces and displacement are in a controlled scope.The main beam achieves a reasonable operating condition in the process of using.(2)Determine the construction of the seat of the average annual temperature which is 15.8 ? to be the reasonable reference temperature.Obtain reasonable cable force level value of the cable-stayed design control reference temperature stress in a range of stay cables.When the cantilevered section is under the action of extreme temperatures and temperature changes,floating displacement amount is the minimum compared to value of the reference temperature for the displacement,and cable-tension deflection point is very close to zero.(3)Through the analysis the action tower posture under different temperatures,determine a reasonable amount of tower pre-partial to be 1mm.Pylon is in compression.Under reasonable cable force level value,the roots of cantilevered segment and steel truss do not exceed the regulatory requirements.(4)The effect of temperature on the cantilevered section is large.Reference to the displacement of overhanging at the reference temperature,the floating amount of displacement of cantilevered section is 20 mm at extreme temperatures.Non-cantilevered section main beam is equilibrium at the reference temperature.Displacement distortion at extreme temperatures is in the range of 5mm.Rail operators need to adjust in the process.The track adjustment measures of overhanging segment and non-cantilevered segment due to their displacement varies.(5)According to the simulation analysis,get the displacement and strain monitoring programs for key parts of the cable,tower,cantilevered concrete beams segment and steel truss,etc.And provide reference for monitoring of the construction and operation of structures...