Simplified modeling method for lightning strike electromagnetic transient of piers of high-speed railway viaduct
A modeling method, electromagnetic transient technology, applied in the direction of design optimization/simulation, geometric CAD, special data processing applications, etc., can solve the problems of difficult and complex modeling of viaduct piers, reduce space complexity, simplify construction Model method, the effect of calculating convenience
Active Publication Date: 2021-05-14
HEFEI UNIV OF TECH
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Problems solved by technology
[0007] The technical problem to be solved in this paper is the difficulty and complexity of the modeling of viaduct piers due to the complexity of the viaduct steel structure in lightning protection
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[0045] figure 2 and image 3 The viaduct pier structure in the embodiment of the present invention is given. As can be seen from the figure, the viaduct pier in the present invention is in a Y shape as a whole, which is a conventional viaduct pier.
[0046] figure 1 It is a flow chart of the simplified modeling method for lightning strike electromagnetic transient of high-speed railway viaduct pier pier in the present invention. As can be seen from this figure, the simplified modeling method of the present invention comprises the following steps:
[0047] Step 1. Obtain the perimeter data of the cross-section of the viaduct pier at different sampling heights by sampling, and form a related data set.
[0048]According to the relationship between the cross-sectional perimeter of each part of the viaduct pier structure and the height change, the viaduct pier is firstly divided into three parts from bottom to top: the bottom of the pier, the middle of the pier and the top of ...
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The invention discloses a method for simplified modeling of lightning strike electromagnetic transient of bridge piers of high-speed railway viaducts, which belongs to the field of lightning protection of high-speed railway viaducts. The method first obtains the perimeter data of the corresponding cross-sections of the viaduct piers at different heights according to the actual structure of the viaduct piers, and forms a related data set. Then the viaduct pier is regarded as a good conductor, and the skin depth of the pier is calculated, and then the functional relationship between the perimeter of the cross-section of the pier and the corresponding height is fitted, and finally, according to the skin depth, the above-mentioned fitted functional relationship and the formula of unit length impedance, The overall frequency-varying impedance of the bridge pier is calculated to obtain the overall frequency-varying impedance model of the bridge pier. The invention ignores the steel bar structure in the bridge pier, regards the viaduct bridge pier as a solid good conductor, simplifies the space complexity of the model, and provides a simplified method for modeling the viaduct bridge pier under the action of lightning current.
Description
technical field [0001] The invention belongs to the field of lightning protection for high-speed railway viaducts, and in particular relates to a lightning strike electromagnetic transient modeling method for piers of high-speed railway viaducts. Background technique [0002] my country's vast territory and complex and diverse landforms determine that my country needs to use a large number of viaduct structures in the process of building high-speed railways. my country's viaducts are reinforced concrete structures. According to statistics, the proportion of viaduct sections is more than 50%. Taking the Passenger Dedicated Line and the Beijing-Shanghai High-speed Railway as examples, the viaduct section accounts for 86.6% and 80.4% of the entire line respectively. The viaduct is relatively higher than the surrounding ground, and the probability of the catenary in the viaduct section being struck by lightning is greater than that of the subgrade section. Lightning accidents ar...
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IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20
Inventor 向念文胡宾李科杰叶维平边凯陈维江王立天徐宗奇沈海滨赵海军阳晋程凌云周雨秋王书来王鹏程
Owner HEFEI UNIV OF TECH