Study On The Application Of Supported Single-span Self-anchored Suspension Pedestrian Overpass

In this paper,based on practical engineering,structural static analysis,construction process analysis,static wind stability analysis and human-induced vibration response analysis of a single-span self-anchored suspension bridge with novel structure are carried out,which provides theoretical basis for the safe application of the new structure.Finally,the influence of main cable inclination and elevation change on structural stiffness is discussed.Specific research contents and results are as follows:1.The initial alignment of the structure is calculated by the nodal method,and the initial tension of the main cable is determined by Midas-Civil software.The precise initial state of the structure under the pre-tension is calculated.The internal force of the structure is analyzed.It is known that the weak points of the structure are the upper chord in the span of the stiffening beam,the web bar at the end and the lower chord at the end,which should be strengthened in the design.?2.Check the local and overall instability of the structure,the local stability of the structure meets the requirements,and the overall stability is better.3.The calculation and analysis of the construction process of the structure are carried out by using the comprehensive analysis method of forward-inverted assembly,and the alignment of the empty cable and the pre-deviation of the cable clamp are obtained.4.The static wind stability of the structure is analyzed,and the critical wind speed of the structure is calculated.The static wind stability of the structure is very good,which shows that the overall stiffness of the structure is large,especially the lateral stiffness.The influence of wind angle of attack on critical wind speed is analyzed.5.By calculating the dynamic response of the structure under pedestrian load,the dynamic stability of the structure meets the requirements,especially the lateral dynamic stiffness is better,which is consistent with the conclusion of the modal analysis.6.The influence of the main cable inclination and elevation on the structural stiffness is analyzed,and the correctness of the selected elevation and elevation is verified.The influence of the elevation of the main cable on the prestressing effect of the structural self-anchoring force is analyzed,and the advantages of the single-span self-anchored suspension bridge are verified.7.By comparing and analyzing the stiffness of different main cable's sagittal height and inclination angle,this paper discusses how to reasonably determine the sagittal height and inclination angle of the main cable.