Research On Mechanical Behavior Of Ground-Anchor Pedestrian Suspension Bridge

The ground anchored pedestrian suspension bridge has a large spanning capacity,beautiful appearance,and diverse shapes.Each bridge component can be prefabricated by the factory and assembled on site,which can greatly shorten the construction period,so it is widely used in parks,scenic spots,and canyons.The ground-anchored pedestrian suspension bridge is a suspension system with main cables as its major load-bearing members.Compared with highway and railway suspension bridges,it has a small width-span ratio,large structural flexibility,significant wind load effects,and a high degree of geometric nonlinearity.Under wind load,it is easier to cause large structural deformations and instability,so it is necessary to study the mechanical behavior and static wind stability of ground-anchored pedestrian suspension bridges.Based on relevant researches conducted demostically and internationally report analyzes the mechanical behavior and static wind stability of the ground anchored pedestrian suspension bridge,and discusses the impact of wind resistant cables on the bridge's structural dynamic characteristics and static wind stability.The design and construction of bridges provide a certain reference value.The specific research contents are as follows:(1)The internal forces,stresses and displacements of the main components of the ground-anchored pedestrian suspension bridge under the effects of bridge dead load,crowd load,temperature load,sling breakage and the most unfavorable coupling were calculated.During the most unfavorable coupling effect,the safety state of the structure was checked.(2)According to the parameter sensitivity target value of the ground-anchored pedestrian suspension bridge and the calculated result of the parameter sensitivity target value after normalization,the sensitive parameters of the mechanical response of the ground-anchored pedestrian suspension bridge's components are summarized and the When arranging single or multiple groups of wind-resistant cables at different locations,the dynamic response of ground-anchored pedestrian suspension bridge is discussed,and the optimal wind-resistant cable layout scheme that is most suitable for the bridge in optimizing the dynamic response is was obtained.(3)The three-component force coefficient of the section of the stiffened beam of the ground-anchored pedestrian suspension bridge under different wind angles of attack is calculated,and the three-component force coefficient curve is was analyzed.The calculated static wind load was applied to the Midas/Civil finite element model,and two unstable wind speeds of the ground-anchored pedestrian suspension bridge were obtained through calculation.Based on this,the mechanical response of bridge components under static wind load with different initial wind angles of attack and different wind-resistant cable layouts is discussed.The mechanical response of bridge components under static wind load is summarized Variation law of wind angle of attack and optimal wind cable layout based on static wind stability..(4)Carried out mechanical behavior test research on ground-anchored pedestrian suspension bridge,including static test and dynamic test,discussed the static response of each component of the structure under static load,and compared with the model theoretical data to verify the stress of the bridge rationality.