Study On Static Characteristics Of Suspension Bridge With Three Towers

The muli-pylon suspension bridges is a new trend of the development of suspension bridge.The three towers suspension brige is based on traditional two-towers suspension bridge.which is add a mian tower at the middle mian span.Because of the middle tower,the mian cable and the anchorage have less foce.Compared with the traditional two towers suspension bridge, although the main cable is the mian loading-bear for all suspension bridge.But, because of the mian tower and mian span,make the mechanical behavior of the structure is different. Against this background, the three towers with four span suspension bridge which at Wuhan yingwuzhou was researched and analyzed.The static characteristics, the influence of the parameter of structure for three towers four span suspension bridge, the hoisting process of stiffening girder were introduced. At static characteristics, finite element method was set up by BNLAS. With the finite element method, the internal force and displacement of the structure were analyzed.The internal foce of towers,sling,stiffening gider of three towers four span suspension bridge were analyzed. At the influence of the parameter,series of model were built to analyze with different rise span ratio,side span ratio, the rigidity of stiffening girder, the height of middle tower,the rigidity of middle tower.The influence of these parameter of structure on internal foce and displacement were anlalyzed.At the Stiffening girder hoisting,the top of tower’s displacement,the difference of the internal foce of mian scable on both side of middele tower.the bending moment of the bottom of towers were analyzed.Finally, the statice characteristics and the influence of structure parameters were summarized.