Static And Dynamic Calculation Of Single-cable Plane Concrete Cable-stayed Bridge With High And Low Towers Detailed Stress Analysis Of Cable-and-girder Anchoring

A(100+340+150)m highway single-cable plane,high-low tower,single-cable plane cable-stayed bridge is introduced by this thesis as the research object,it carries out detailed calculations on the construction and operation stages of the cable-stayed bridge,analyzes the dynamic characteristics of the bridge,and focuses on the cable and girder.A detailed stress analysis of the anchorage area and optimization suggestions are made in order to provide reference and reference for similar bridge designs in the future.The main research contents are as follows:(1)The development history of high and low tower cable-stayed bridges and single-plane cable-stayed bridges is firstly introduced by this thesis,and then analyzes the development of several high-low tower cable-stayed bridges and single-plane cable-stayed bridges that have been built and under construction in China.The characteristics of the bridge type,followed by the introduction of the commonly used forms of cable and girder anchorage of concrete cable-stayed bridges,and the planning and overall design of the bridge studied in this article.(2)The practical finite element software MIDAS/CIVIL is used to simulate a single–cable plane cable-stayed bridge with high and low towers with a main span of 340 m,describing the main girder,high and low towers,cable-stayed cables,pile foundations,prestress and boundary conditions the simulation ideas and methods of simulation.Divide the construction stage according to the construction plan to understand the deformation,internal force and stress changes of the bridge;according to the ’General Code for Design of Highway Bridges and Culverts’ (JTG D60-2015),consider seven load combinations,and calculate the cable-stayed bridge under each load combination.Girder stress,high and low pylons,and cable-stayed stress,etc.(3)The ’m method’ is selected to simulate the interaction of foundation piles and soil,and the self-vibration characteristics of the single-cable-plane cable-stayed bridge with high and low towers at the completion stage are analyzed.According to the ’Code for Seismic Design of Highway Bridges’ (JTG/T 2231-01--2020),the response spectrum analysis method and time history analysis method are used to calculate the seismic response of cable-stayed bridges.Finally,the calculation results of the two methods are compared and relevant conclusions are drawn.(4)Introduce the commonly used cable-girder anchoring methods for cable-stayed bridge cables and concrete main girders.The general finite element software ABAQUS is used to simulate the local force in the anchorage area of the cable-stayed bridge,calculate the stress of each member under dead load and the combination of dead load and live load respectively,and propose adding prestressed girders to reduce the main anchor block.Tensile stress measures,and check calculations to prove its effectiveness.