Suspension cable pipeline bridge forming wind cable line shape calculation method based on correction influence matrix
A technology that affects matrices and calculation methods. It is applied in special data processing applications, instruments, and electrical digital data processing. It can solve the problems of not being in a plane, the gap between the wind cable and the parabola, and the inability to install. The effect of improving calculation accuracy
Active Publication Date: 2020-12-04
BC P INC CHINA NAT PETROLEUM CORP +2
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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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[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0047] The present invention makes the following assumptions to the wind cable cable system of the space cable-shaped suspension bridge:
[0048] (1) The wind cables and wind stay cables are ideal flexible cables with small strains, and their materials satisfy Hooke's law, and the Poisson effect is ignored.
[0049] (2) When the bridge is completed, the wind cables only incline along the direction of the transverse bridge, and the inclination error of the wind cables in the longitudinal direction of the bridge during the construction process is ignored.
[0050] A calculation method for the wind c...
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The invention relates to a suspension cable pipeline bridge forming wind cable line shape calculation method based on a correction influence matrix, and belongs to the field of oil and gas pipeline crossing design, and the method comprises the steps: estimating a wind cable starting end three-way component force according to a space parabola theory; 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 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 linear coordinate of the wind cable 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 suspension pipeline bridge based on a modified influence matrix, and 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 ...
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Login to View More IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14
Inventor 左雷彬胡川川杨威詹胜文刘思萌陈晓晖李国辉
Owner BC P INC CHINA NAT PETROLEUM CORP