Method for determining and rapidly realizing bridging optimum cable forces of rigid framework-arc composite bridges

Abstract

The invention discloses a method for determining and rapidly realizing bridging optimum cable forces of rigid framework-arch composite bridges. According to the method, a constraint cable force optimization method and an influence matrix method are comprehensively applied in the optimum cable force determination process, and mutual influence matrixes between cable forces are imported, so that theconcept is clear and the bridging optimum cable forces of rigid framework-arc composite bridges can be rapidly determined without iteration. Under a bridging optimum cable force combination determinedby utilizing the method, stress states of both the main and subordinate structures of the rigid framework-arc composite bridges can be reasonable. Moreover, the invention provides a method for rapidly realizing optimum target cable forces via measured bridging cable forces, so that the problem of repeated adjustment of the traditional cable adjustment methods is avoided, and the time and labor costs are saved; and the method is efficient and rapid.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering and relates to a rigid frame-arch composite bridge, in particular to a method for determining and quickly realizing the optimal cable force of a rigid frame-arch composite bridge. Background technique [0002] For cable structure systems (such as middle-supported arch bridges, partial girder-arch composite bridges, and cable-stayed bridges, etc.), whether the completed bridge state is reasonable or not is closely related to the value of the cable force, and the cable force corresponding to the reasonable bridge state is the most Youcheng bridge cable force. At present, the methods for solving the optimal cable forces of completed bridges can be roughly divided into four categories. The first category is the cable force optimization in a specified stress state, represented by the rigidly supported continuous beam method, zero displacement method, and specified stress method; The second ...

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Problems solved by technology

Comprehensive analysis of the existing optimal cable force determination method applied to similar rigid frame-arch composite bridges has two shortcomings: first, the existing methods are mainly for cable-stayed bridges or arch bridges, while for bridge structure systems combined with arches or other Composite bridges should not only care about the rationality of the main structure state, but also care about whether the stress state of the subsidiary structures is reasonable. Therefore, if the existing method is directly applied to the composite bridge structure, its applicability and superiority need to be further studied; There are methods that do not point out the mutual influence between the cable forces in the process of cable adjustment, nor clarify the differences and connections between the cable force in the cable adjustment process, the change in cable force, the target cable force, and the control cable force. In actual engineering practice, these The confusion of concepts will directly affect whether the bridge status is reasonable

Often after the completion of the second-phase dead-load construction of the bridge, the actual measured cable force does not reach the optimal target cable force through field tests, so cable adjustment is required. In the past, the method was to approach the target cable force by adjusting back and forth many times. This method is not only time-consuming It is labor-intensive, and the effect of adjustment is difficult to meet expectations

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