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

Abstract

The invention relates to a large-span suspension cable pipeline bridge finished bridge wind cable line shape calculation method and belongs to the field of oil and gas pipeline crossing design. 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; obtaining an iterative variable increment by utilizing a correction influence matrix method, repeatedly iterating, correcting the three-way component force of the starting end of the wind cable, 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 invention relates to a method for calculating the wind cable line shape of a long-span suspension pipeline bridge, which belongs to the field of spanning design of oil and gas pipelines. Background technique [0002] Pipeline suspension bridges are generally composed of main cables, suspension cables, wind cables, wind stay cables, stabilizing cables (conjugate cables), stiffening beams, cable towers and anchorages. Since its main purpose is to transport oil, natural gas or water, supports are usually set up on the bridge deck for erecting pipelines, and a simple maintenance path is set up to facilitate the construction and subsequent maintenance of pipelines. Pipeline suspension bridges have a small width-span ratio, low structural rigidity, and are sensitive to wind resistance. Generally, wind cable systems need to be installed. The mechanical characteristics of the pipeline suspension bridge are: the load acting on the bridge deck and the verti...

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

Images