Stayed cable tensioning method for cable-stayed bridge with optimal cable force in construction process

Abstract

The invention discloses a stay cable tensioning method for a cable-stayed bridge with optimal cable force in a construction process, which only needs to tension a stay cable once in a construction section, and can realize small cable force change and uniform cable force after bridge formation in the process. Meanwhile, the proposed method can avoid repeated iterative analysis, the optimized cableforce result is more reliable due to the consideration of the influence of shrinkage creep, material nonlinearity and the like in the process, and the method has important value and significance for tensioning of similar bridge stay cables and guidance of field construction; according to the novel cable-stayed bridge cable force optimization method provided by the invention, the cable-stayed bridge is used as an engineering object for analysis, the minimum variation of the cable force in the tensioning process is controlled, and meanwhile, the cable force value of the stayed cable after bridgeformation is uniform; the method is suitable for construction of all suspended and spliced cable-stayed bridge deck systems, the application range is very wide, and a basis is provided for optimization of the tensioned stay cables.

Description

technical field [0001] The invention relates to the technical field of transportation bridge and culvert engineering, in particular to a cable tensioning method for cable-stayed bridges with optimal cable force during construction. Background technique [0002] The cable-stayed bridge is a high-order statically indeterminate structure. Its main load-bearing structure is the cable-stayed cable and the main tower. The ultimate service life and age of the bridge. Accidents caused by stay cable breaks are common in history, and the economic losses caused are immeasurable. Researchers generally analyze and solve this problem from two aspects. One is to use materials with higher strength and better fatigue resistance; the other is to optimize the tension of cable stays in terms of structural stress. In the case of ensuring a smooth bridge deck, the cable force is made uniform. Because the material is limited by the current technical level, the high-strength steel strands of 186...

AI Technical Summary

Problems solved by technology

There are many methods for cable force optimization of cable-stayed cables, such as minimum bending energy method, matrix method, rigidly supported continuous beam method, etc. These methods have their own advantages and disadvantages, but they have one thing in common: they need to be readjusted after the bridge is completed.

As we all know, the cable-stayed bridge has a very large workload for the second cable adjustment after the completion of the bridge. Repeated adjustments are required, which wastes manpower, material resources and construction time. Due to the continuous tension and release, the anchor head is easy to wear and has a potential safety risk.

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