Large-span suspension cable pipeline bridge finished bridge wind cable line shape calculation method based on pitch line method

Abstract

The invention relates to a large-span suspension cable pipeline bridge finished bridge wind cable line shape calculation method based on a pitch line method, and belongs to the field of oil and gas pipeline crossing design, and the method comprises the steps: estimating a wind cable initial end three-way component initial value according to a space parabola theory; iteratively calculating and obtaining corrected three-way component force of the starting end of the wind cable by utilizing a pitch line method; taking the three-way component force of the starting end of the wind cable and a design control point as iterative initial values, and calculating the wind cable shape and the unstressed length of each cable section by utilizing a space segmentation catenary theory; and correcting thethree-way component force of the starting end of the wind cable by using an influence matrix method, and recalculating to obtain the wind cable shape and the unstressed length of each cable section. According to the method, the problems of inaccurate design, excessive assumptions and too large calculation errors in the prior art are solved, and the calculation accuracy of the line shape and the unstressed length of the finished bridge wind cable of the suspension cable pipeline bridge can be greatly improved by adopting the method to carry out design and calculation.

Description

Technical field [0001] The present invention relates to a Long Span Bridges pipeline suspension bridge cable wind linear calculation method based on the pitch line, belonging to the field of oil and gas pipelines across the design. Background technique [0002] Suspension from the main cable duct typically, slings, the cable winds, wind cable, stable cable (cable conjugation), stiffening girder, the anchor tower and other components. Because its main purpose is to transport oil, gas or water, it is usually provided for erection on the deck support pipe, and is provided to facilitate easy access channel construction and maintenance of pipelines late. Suspension width smaller than the pipe cross, a small structural rigidity wind sensitive, generally need to wind the cable system is provided. Suspension pipe stress characteristics are: acting on the bridge deck due to wind loads and vertical loads generated by the cable slings transmitted to the main cable, and then transmitted to t...

AI Technical Summary

Problems solved by technology

However, the actual line shape of the wind cable segment located between the cables is a space catenary, not only is there a large gap between the line shape of the whole wind cable and the parabola, but also the wind cable and the wind cable are not in the same plane

Only using the spatial parabola theory to calculate the wind cable line shape and unstressed length will not only cause a large gap between the real line shape and the design line shape, but will even cause the problem that the wind cable system is difficult or even impossible to install

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