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Method for judging overall rigidity of railroad bridge

A bridge and overall technology, applied in the field of evaluating the overall stiffness of railway bridges, can solve problems such as difficulty in applying different bridge stiffness designs and large differences, and achieve the effect of avoiding dynamic analysis and checking work, facilitating review, and improving application prospects.

Active Publication Date: 2020-06-23
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the limitation of the bridge span involved in the stiffness design requirements in the prior art, and the deformation of the bridge girder with different spans and forms varies greatly under the action of various factors, and it is difficult to be suitable for the above-mentioned deficiencies in the stiffness design of different bridges, providing An Evaluation Method for Overall Stiffness of Railway Bridge

Method used

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  • Method for judging overall rigidity of railroad bridge
  • Method for judging overall rigidity of railroad bridge
  • Method for judging overall rigidity of railroad bridge

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Embodiment

[0034] A method for judging the overall rigidity of a railway bridge, comprising the following steps;

[0035] a. Through on-site measurement or numerical simulation, test or calculate the train response when the train passes through several work points, and obtain the first deformation excitation curve and the sample library of the corresponding acceleration response under the first deformation excitation factor. The first deformation excitation curve is measured to obtain the first string measurement value, and the first string measurement value-acceleration relationship is obtained by fitting as follows:

[0036]

[0037] Among them, a z is the vertical acceleration, a y is the lateral acceleration, s z is the measured value of the vertical chord, s y is the transverse chord value, k z is the slope of the fitting curve between the measured value of the vertical chord and the vertical acceleration, b z is the intercept of the fitting curve between the measured value ...

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Abstract

The invention relates to the technical field of bridge rigidity design, and particularly discloses a method for judging the overall rigidity of a railroad bridge. According to the method, the overallrigidity of the bridge is judged through the chord measurement value, the calculation is convenient, rapid review is faciliated, the established sample library can be widely applied to rigidity evaluation of each bridge design stage; differences of influences of various loads on rail deformation under different spans, bridge types and geological conditions do not need to be considered; the methodis simple in operation, saves design time and cost, is particularly suitable for overall rigidity evaluation of large-span bridges which are not involved in existing specifications, effectively avoidsa large amount of dynamic analysis and check calculation work during large-span bridge design and the problems of construction cost rising, later maintenance difficulty and operation safety caused byunreasonable design rigidity, and has an excellent application prospect.

Description

technical field [0001] The invention relates to the technical field of bridge stiffness design, in particular to a method for judging the overall stiffness of a railway bridge. Background technique [0002] For long-span bridges (span greater than or equal to 100m), environmental factors such as wind, temperature, creep, and settlement have a significant impact on structural performance, and the static structural deformation caused by environmental factors is often greater than the dynamic structural deformation caused by pure trains . [0003] The stiffness limit requirements of the current design code are only applicable to steel beams with a span not greater than 168m and concrete beams with a span not greater than 128m. There is no limit standard for bridges exceeding this span, and the static and dynamic deformation limit requirements for rails cannot be applied to Bridge design, and the current limit value only requires that the structure can meet the strength require...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20G06F111/10G06F119/14
Inventor 郑晓龙徐昕宇高芒芒陈星宇周川江陈克坚曾永平杨国静陶奇宋晓东董俊苏延文庞林颜永逸刘力维
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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