Static Property Analysis Of Self-anchored Combined Cable-stayed Suspension Bridge

As a kind of new structural system bridge, self-anchored cable-stayed suspension bridgehas both merits of self-anchored suspension bridge and cable-stayed bridge, but itsmechanical behaviors are more complicated. It not only has higher wind-resistance stabilitybut also has lower tower; besides it dosen't need steel for whole girder and huge anchorage toaccommodate weak geological conditions and save so much money. So we can say that thiskind of bridge must have an excellent future. Combined with the real projectscheme—Jinzhou Gulf Bridge with 400m main span, this paper gives the study and analysisabout the static properties of self-anchored cable-stayed suspension bridge. The main researchworks are as follows:(1) The plane static model of self-anchored cable-stayed suspension bridge of JinzhouGulf Bridge is built based on FEM. Analysis and compare ith the methods of linear system oftwo order and the the methods of nonlinear are done with the live load first. Calculating errorof linear system of two order is done in the next. A conclusion is gotten that whether themethods of linear system of two order can improve the efficiency to replace the methods ofnonlinear. The anasysis under the live load, whole temperature effect, shrink and creep ofconcrete, temperature gradient, temperature difference between cable and girder, solarradiation to tower and foundation settlement are done for the structure to find out the stressfeature. The force and stress of the main components (e.g. Main girder and main tower) underthe most unfavourable combination of loads are listed. The analysis result of the Jinzhou GulfBridge whether conforms to the mandatory requirements of the specification is checked in theend.(2) Based on the finite element theory, Parameter analysis is proceeded considering thenonlinear factors of emphasize structure large displacement, cable gravitational sag effects,the influence of initial strains, axial forces-bending moment interaction in the bridge girderand so on. The anasysis about the static properties under different load for the importantparameters are gotten. Such as the rise -span ratio, the location of assistant pier and the ratiobetween side span and main span. The investigation indicates what could be done to avoidfatigue damage the stress amplitude for the end suspender. Tow advisable constructionmethods of self-anchored cable-stayed suspension bridge are also expounded and theeconomic evaluation is developed for the advisable construction methods. (3) The spatial static model of self-anchored cable-stayed suspension bridge is builtbased on FEM to analysis the aerostatic wind stability. The judgement of the Jinzhou GulfBridge's aerostatic lateral buckling and aerostatic torsional divergence whether conforms tothe mandatory requirements of the specification is checked in the next. Influence degree of theinitial angle of attack, form of pile foundation, form of cable in the model and additionalangle of attack for the bridge under the aerostatic wind are fotten in the end.