Research On The Design Of The Composite Landscape Arch Bridge With Large Angle Of Main And Auxiliary Arch

With the continuous improvement of social and economic level and people’s demand for quality of life,higher requirements are put forward for bridge landscape design.As a new type of arch bridge structure,the large angle main and auxiliary arch composite landscape arch bridge can better coordinate the bridge landscape and environmental landscape,and meet people’s spiritual pursuit of bridge aesthetics.Because the main and auxiliary arch composite Landscape Arch Bridge with large angle is different from the traditional arch bridge in structural form and mechanical behavior,it has theoretical and engineering practical value to carry out the research on the design of the main and auxiliary arch composite Landscape Arch Bridge with large angle based on landscape and stress.Firstly,the selection method of the reasonable bridge type of the Landscape Arch Bridge is studied.The research shows that:the large angle main and auxiliary arch composite Landscape Arch Bridge has better lateral stability;the hydrophilic space under the bridge is large,and the navigation ability is good;the three-dimensional sense of the bridge space is better,and more coordinated with the open environment;the bridge has tension,dynamic,and can integrate with the surrounding environment,forming a dynamic landscape.Through numerical analysis,the reasonable inclination range and arch axis form of the main arch are studied.The results show that the reasonable inclination angle of the main arch is about 80°and the reasonable axis of the main arch is a parabola:z=-0.0059x~2+0.0015x+71.201Through the finite element analysis,the static and dynamic behavior of the large angle main and auxiliary arch composite Landscape Arch Bridge is studied,and through the model test and the static three component force coefficient obtained by ansys-cfd,the seismic and wind resistance performance of the large angle main and auxiliary arch composite landscape arch bridge structure is analyzed.The results show that:(1)In the construction process,the main beam at the support is the biggest force,and the out of plane bending moment of arch ring can not be ignored in the completed bridge state.(2)The basic frequency of large angle main and auxiliary arch composite Landscape Arch Bridge is 0.283hz,the corresponding vibration mode is the overall longitudinal movement of the main beam,the structure is relatively gentle,and its dynamic behavior should be analyzed emphatically.(3)The results show that the dead load effect of main girder is far greater than E2seismic effect,and the seismic effect does not control the design of the main girder;the seismic effect on the main arch is large,so the seismic design of the main arch should be fully considered to ensure the material strength of the main arch;the safety factor of the suspender is 4.6,which has sufficient strength reserve.(4)The main and auxiliary arch composite Landscape Arch Bridge with large inclination angle has good wind resistance performance.Finally,through the scheme comparison and parametric design,the landscape and mechanical optimization of the large angle main and auxiliary arch composite Landscape Arch Bridge is carried out.The research results of this paper have been applied in the design of the large angle main and auxiliary arch composite Landscape Arch Bridge of the No.3 bridge of Wulan Mulun River,which has reference value for the construction and development of the Landscape Arch Bridge.