Determination and fast realization method of optimal cable force of rigid frame-arch composite bridge

Abstract

The invention discloses a method for determining and quickly realizing the optimal cable force of a rigid frame-arch composite bridge. The method comprehensively applies a constrained cable force optimization method and an influence matrix method in the process of determining the optimal cable force, and introduces The interaction matrix between the cable forces is clear, and the optimal cable force of the rigid frame-arch composite bridge can be quickly determined without iteration. Under the optimal cable force combination of the completed bridge determined by the invention, the stressed state of the main and auxiliary structures of the rigid frame-arch composite bridge can be made reasonable. In addition, the method for quickly realizing the measured cable force of the bridge to achieve the optimal target cable force in the present invention avoids the problem of repeated adjustments in the traditional cable adjustment method, saves time and labor costs, and is an efficient and quick method.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, relates to a rigid frame-arch composite bridge, and in particular relates to a method for determining and quickly realizing the optimum cable force of a rigid frame-arch composite bridge formed into a bridge. Background technique [0002] For cable structure systems (such as middle and lower bearing arch bridges, partial beam-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 completed bridge state is the maximum Excellent bridge cable strength. At present, the methods for solving the optimal bridge cable force can be roughly divided into four categories. The first category is the cable force optimization of the specified stress state, represented by the rigid support continuous beam method, the zero displacement method and...

AI Technical Summary

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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