Study Of The Type And Stability Of Cable-Arch Structure

With the characteristics of good load carring capacity and aesthetic feeling , arch structure has been widely used. But the arch structure has weakness in carring asymmetric load, especially having a large horizontal force in the skewback so that needing a large rigidity in the skewback support. But it is more difficult to meet the condition as a root structure. Compared with the arch structure, the cable-arch structure is improved greatly in earring load capacity, particularly in asymmetric load and decrease largely the horizontal force .For this reason, the cable-arch structure is consenienl for used in actual project. The behavior of cable-arch structure is studied in detail in this paper. The study lays solid theoretical foundations of applying the structure to actual projects.The relevant contents are as follows:1 The History, study and problem of arch structure and arch composite structure at present is summarized in the paper. For the characteristics of good earring capacity, aesthetic feeling and rich composite types , the arch composite structure would be widely used in actual project. The cable-arch structure is a kind of arch composite structure.2 The cable-arch structure is used often as a large span structure.Only using geometrical non-linearity to study the stability of the cable-arch structure can content the need of actual enginerring. A more perfect geometric nonliner mechanical mode is proposed here . Geometric nonlinear limit element method formulas of spatial beamelement and cable element are derrived. Geometric nonlinear equilibrium path is analyzed by Newton-Raphson Methed and Arch-length-type Method.3 Rise-span ratio and load action is important for the stability of cable-arch structure, The eigin, limit earring capacity and overall rigidity of six kinds of cable-arch structure are studied in different from rise-span ratio and load action, and the stability of the structures are comparatively studied so that the earring capacity of the six kinds of sturctures are obtained in the paper.4 Comparated with arch structure, the horizontal force is decreased largly in the cable-structure.The stability of six kinds of cable-arch structure are studied in defferent from sdewback anti-thrust rigidity and area of cross section of cable,when skewback anti-thrust rigity is small,the large earring capacity can be obtained in the structures. The capacity make it possible that the cable-arch structure can be used largly in actual project.5 A paraboloid cabe-arch structure and catenary cable-arch structure has not studied before.The stability of the structure is studied in defferent from load action n rise-span ratio ,area of cross section of cable and skewback anti-thrust rigidity. The study shows that the earring capacity is same as the cylindrical structure.6 For cable-arch stoucture can be used greatly in actual project, based on above work, a simple design method is developed for cable-arch structure.