Analysis of Key Design Parameters of Curved Cable-stayed Bridge
The structural system of curved cable-stayed bridges is complex and the design difficulty is high.If the design parameters are unreasonable,it will bring significant safety hazards.In order to improve the design quality of curved cable-stayed bridges,the basic characteristics of curved cable-stayed bridges were summarized.The ground anchored single tower curved cable-stayed bridge of National Highway S105 was taken as the analysis object,and the design parameters of its tower,main beam,cable-stayed cable,and structural system were analyzed.A bridge calculation model was established,and the influence of curve radius on torque,tower span ra-tio on cable force,and displacement of the main beam under different wind speeds were analyzed.The research results showed that aux-iliary piers or cable systems should be set up in the design of single tower curved cable-stayed bridges,and the tower beam consolida-tion system should be preferred.The curve radius should be controlled above 800 m as much as possible.Due to the linear negative cor-relation between the tower span ratio and cable tension of cable-stayed bridges,in order to prevent excessive cable tension,the tower span ratio should not be too small.When the wind speed in the area where the cable-stayed bridge is located is greater than 40 m/s,the main beam displacement is large and reinforcement treatment is required.
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