Pretensioned arch bridge

Abstract

The invention discloses a pretensioned arch bridge. The pretensioned arch bridge is mainly composed of arch ribs, bridge deck systems, rigid vertical joints, flexible hanging bars, transverse bracingsand pretensioned cables. A pair of rigid vertical joints is correspondingly arranged at 1 / 4, 1 / 2 and 3 / 4 position of the bridge deck systems, and the flexible hanging bars are uniformly arranged in the rest positions of the bridge deck systems. The upper ends of the rigid vertical joints are connected with the arch ribs, and the lower ends of the rigid vertical joints are connected with the bridge deck systems. The rigid vertical joints form rigid hoops with the bridge deck systems and the transverse bracings. The pretensioned cables are arranged symmetrically in a midspan, the pretension isapplied, the upper ends of the pretensioned cables are connected with the 1 / 4, 3 / 4 position of the arch ribs, and the lower ends of the pretensioned cables are connected with the bottom portion of themidspan rigid vertical joints. The pretensioned arch bridge is reasonable in receivinf strength, has the advantages of good stability, large rigidity, good economic benefit, beautiful appearance andthe like, provides a new effective way for the breakthrough of stiffness enhancement and stability bottlenecks of arch bridges, and has great engineering application value.

Description

technical field [0001] The invention belongs to an arch bridge system, in particular to a pretensioned arch bridge. Background technique [0002] The main load-bearing members of the arch bridge system are the arch rings or arch ribs. Under the action of vertical load in the arch bridge system, the piers and abutments bear horizontal thrust, and at the same time, the piers and abutments have a pair of horizontal reaction forces against the arch, and the bending moment generated by the horizontal reaction force in the arch basically offsets the bending moment caused by the vertical load. Therefore, the arch is the main component under pressure. Compared with beams of the same span, the bending moment, shear force and deformation of the arch are much smaller. [0003] An arch bridge is a bridge in which the main load-bearing member is an arch ring or arch rib that bears axial pressure. The arch structure is composed of an arch ring (arch rib) and its support. Arch bridges c...

AI Technical Summary

Problems solved by technology

The three-hinged arch is to add a hinge to the vault of the double-hinged arch. The rigidity of the structure is even worse, and the construction and maintenance of the vault hinges are also complicated. Generally, it is not suitable for the main arch circle.

Due to the relatively small width-span ratio of long-span arch bridges, the relative stiffness is relatively weak. Under the action of external factors, in addition to the axial force, the internal force of the structure, the bending moment and torque account for a large proportion, and the structural deformation is nonlinear. The mechanical performance of the structure changes from the elastic state to the inelastic state, which will easily cause the structure to be crushed and damaged and lose the stable bearing capacity of the structure.

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