| Assembled with main cables,hangers and steel girders,suspension bridge with three-dimensional spatial cable characteristic is a kind of stress reasonable and profile graceful bridge.It is trend for super long span bridge to construct,in the future,with a great characteristic increase of both the lateral stiffness and resist of wind but just a little hanger force increase.What is more,Meticulous analysis of spatial cable-system suspension is the guarantee of spatial cable-system suspension bridge design and construction.Following contents have been done for improving the meticulous analysis of construction of spatial cable-system suspension bridge.Base on the catenary element tangent stiffness matrix and the method of limitation,the out-plane stiffness is derived and the spatial catenary element stiffness matrix is given.Moreover,the applicability of this spatial catenary element stiffness matrix is researched,some special catenary element stiffness matrix is given such as vertical hangers,cable without gravity and so on.Then the balance principle of.spatial saddle of spatial cable-system suspension bridge during both the finish cable stat and finish bridge stat is studied and the principle of spatial saddle design parameters is also researched.And the vertical and lateral geometry tangent point location are obtained between main cable and spatial saddle through 18 variable equation sets and the Newton iteration method.This paper also study the strands lateral section stable and three-dimensional space stable condition in spatial splay saddle,the spatial splay saddle global design parameters and saddle groove design parameters principle is proposed.And then the reasonable resultant force line theoretical formula is derived which the friction loss of strands force in the splay saddle groove is taken in account.The spatial cable-system suspension bridge line-shape finding program and spatial splay saddle reasonable resultant force line program are written by the program language C++ base on VS2015 development platform.And the results of both BNLAS and paper's program show that paper's programs have the characteristic of easy utilization and high accuracy.Finally,this paper serve Halogaland spatial suspension bridge as object.Propose the reasonable and feasible catwalk ropes erection scheme and determine the initial tension force of catwalk storm rope.Also analysis the unstressed cable length no change principle during the process of strands erection and actual strand erection control technology.And,three schemes of main cable lateral support,including 5 links,7 links and 9 links,is given to make sure that the main cable can be smoothly transform from plane catenary to spatial curve,the impaction analysis of support internal force and main cable line-shape are also shown.This paper also study the rotation displacement of main cable during the transforming from plane catenary to spatial curve,which consist of two parts that one is cable-self section rotation deformation another is global geometry rotation displacement.It is evidenced,through sensitive analysis method,that the cable-self section rotation deformation is not sensitive to the cable bend-torsion stiffness,so the chief part of clamp lateral erection pre-rotation is global geometry rotation displacement.In the end of paper,the steel girder lifting erection is studied and all control indexes is economic and feasible. |
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