Study On Mechanical Behavior Of Long Span Steel Pipe Truss Pedestrian Glass Suspension Bridge In Canyon Scenic Area

The pedestrian suspension bridge is a kind of beautiful bridge type with landscape and traffic function in the scenic spot of the canyon,and a beautiful landscape in the eco-tourism scenic spot of the mountain and the canyon.Tourists walking on the bridge not only enjoy the scenery but also experience the fresh and exciting feeling.The landscape pedestrian suspension bridge has higher requirements on the landscape aesthetic function than the highway suspension bridge.The landscape bridge architecture pays attention to harmony with nature.At present,there are few research results on pedestrian suspension bridges.Therefore,it is very important to carry out research on large-span pedestrian glass suspension bridges.A new type of stiffening beam structure system for pedestrian suspension bridges has hollow ball joints and steel truss stiffening beams.It is first used in large-span pedestrian glass suspension bridges in canyon scenic spots.The steel pipe truss stiffening beam is different from the rigid steel box girder used in most of the current suspension bridges,the stiffening beam of the steel truss composed of the I-shaped steel and the channel steel and the H-shaped steel,and the stiffened beam of the hollow ball joint steel pipe truss The performance of the large-span pedestrian suspension bridge is also different.According to the existing related researches,the research results of the long-span hollow-ball jointed steel pipe truss stiffening beam in the pedestrian suspension bridge are few.In order to deeply study the bearing performance of the long-span steel pipe truss pedestrian suspension glass bridge in the canyon scenic spot,this paper relies on the natural bridge of the Shibuya eco-tourism scenic spot in the Chengkou County,with a main cable span of 416m,for the large-span steel pipe truss stiffening beam pedestrian glass.The suspension bridge is subjected to finite element analysis of the force performance.Considering that the steel pipe truss stiffening beam was first applied to the long-span pedestrian glass suspension bridge,it was decided to carry out the static model test and research of the two sections of the steel pipe truss stiffening beam with a total length of 14.4m long and 3.8m wide.At the same time,a single-slab full-length glass bridge deck test piece of 5200mm×2370mm×50mm in the real bridge is used as a test bridge deck for bending bearing capacity test.The glass bridge deck is calculated with a span of 3400mm.The panel is a glass plate for the current pedestrian glass suspension bridge using a one-way support for the maximum span.In this paper,the high-linear finite element analysis software Marc modeling is used to simulate the full-bridge and two-segment full-scale model.The two-section model is full-footed bridge members except the main cable.The model test bridge deck is loaded with water bags,and the glass bridge deck static test is loaded by the actual crowd load.Under the load of 2.5kN/m~2,the steel truss stiffening beam members are evenly stressed,the overall deformation is small,and the structural rigidity is large.The test results show that the steel truss stiffening beam is in the elastic stage.Under the action of the crowd load of 3.8kN/m~2,the glass plate of the bridge deck has a large bearing capacity.The research results of this paper can be used as reference for the design of long-span steel pipe truss pedestrian suspension glass bridge in the canyon scenic spot.