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CN-122021068-A - Trestle girder deflection inversion method based on double-dip angle measurement

CN122021068ACN 122021068 ACN122021068 ACN 122021068ACN-122021068-A

Abstract

The invention relates to the technical field of calculation methods, in particular to a trestle girder deflection inversion method based on double-dip angle measurement, which comprises the steps of establishing a three-dimensional finite element model of a trestle according to trestle design parameters, carrying out static simulation on the three-dimensional finite element model of the trestle under standard control load working conditions, acquiring simulation parameters, and calculating an initial conversion coefficient according to the simulation parameters Pasting a sensor on the surface of a main beam of a trestle, detecting working parameters of the trestle through the sensor, continuously collecting trestle parameters by the sensor when the trestle enters a steady-state zone of effective load, carrying out iterative calculation according to the trestle parameters, and carrying out the operation on the trestle Obtaining effective conversion coefficient after the sub-lamination Through trestle parameters and effective conversion coefficients The inversion method for the deflection of the main girder of the trestle based on double-dip angle measurement can iteratively generate a new conversion coefficient according to dip angle data of the trestle when the trestle works each time so as to provide an accurate deflection value of the main girder of the trestle.

Inventors

  • ZHAN GUIYOU
  • CHEN HANG
  • ZHAO CUNBAO
  • ZHAO SHENGNAN
  • HE YUZHI
  • ZHAO YINUO
  • CHEN BOYU
  • XU YUREN
  • ZHOU YONG
  • SHAO LIN
  • DING JIAMENG
  • WANG LEI
  • YU SHIXIANG
  • YANG HUI
  • PENG JIANXIN
  • AN KANG

Assignees

  • 中铁四局集团第四工程有限公司
  • 中铁四局集团有限公司
  • 石家庄铁道大学

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. The trestle girder deflection inversion method based on double-dip angle measurement is characterized by comprising the following steps of: Step S1, a three-dimensional finite element model of a trestle is established according to trestle design parameters, static simulation is carried out on the three-dimensional finite element model of the trestle under standard control load working conditions, simulation parameters are obtained, and initial conversion coefficients are calculated according to the simulation parameters ; Step S2, attaching a sensor on the surface of a main girder of the trestle, detecting working parameters of the trestle through the sensor, and continuously collecting the parameters of the trestle when the trestle enters a steady-state interval of effective load; step S3, performing iterative computation according to trestle parameters, wherein Obtaining effective conversion coefficient after the sub-lamination ; S4, through trestle parameters and effective conversion coefficients And inverting the vertical deflection of the trestle.
  2. 2. The method for inversion of the girder deflection of the trestle bridge based on double-dip angle measurement according to claim 1, wherein in the step S1, simulation parameters include: Deflection simulation value of trestle girder midspan Instantaneous inclination simulation value at quarter length position of trestle girder Instantaneous inclination simulation value of trestle girder at three-quarter length position ; Establishing initial conversion coefficients based on acquired simulation parameters Is calculated by the formula: ; calculating to obtain initial conversion coefficient 。
  3. 3. The method for inverting the deflection of the main beam of the trestle based on double-dip angle measurement according to claim 1, wherein in the step S2, the sensor is an dip angle sensor, the dip angle sensor is arranged at the position of one quarter of the main beam of the trestle and the position of three quarters of the main beam of the trestle, and the dip angle sensor is used for acquiring instantaneous dip angle data of the main beam of the trestle.
  4. 4. The method for inverting the deflection of the main girder of the trestle bridge based on double-dip angle measurement as claimed in claim 3, wherein in the step S2, the decision criteria of the steady-state interval of the effective load is that in a continuous period of time And in the process, the absolute values of readings of the two tilt angle sensors are larger than the preset working threshold value of the tilt angle sensor.
  5. 5. A method for inverting the deflection of a main girder of a trestle based on double-dip angle measurement as claimed in claim 3, wherein in said step S2, when the trestle enters a steady-state region of a payload, the dip angle sensor acquires in real time Instantaneous inclination angle data of quarter length position of main girder of trestle at moment And instantaneous tilt data at three-quarters of the length of the main beam of the trestle 。
  6. 6. The method for inversion of the girder deflection of the trestle bridge based on double-dip angle measurement according to claim 1, wherein the step S3 comprises: step S31, based on the initial conversion coefficient Calculation of Moment trestle mid-span deflection value : ; Step S32, establishing a residual signal for reflecting the deviation between the output of the current model and the physical true value based on the theoretical deflection of the trestle in the load steady state at the mid-span position of the trestle being zero Is calculated by the formula: ; Calculating to obtain residual signals 。
  7. 7. The method for inversion of the girder deflection of the trestle bridge based on double-dip angle measurement according to claim 6, wherein said step S3 further comprises: step S33, residual error signal Convergence threshold with preset deflection Comparison is performed: If it is Then consider the initial conversion coefficient Is accurate enough to convert the initial conversion coefficient Directly used as the final result; If it is Then the initial conversion coefficient is updated by adopting a gradient descent method Obtain the first Conversion coefficient after repeated iteration update : In the formula, For learning rate, the value range is 0.01 to 0.1, used for controlling the update speed, Is the number of iterations.
  8. 8. The method for inversion of girder deflection of trestle based on double-dip angle measurement as claimed in claim 6, wherein in said step S33, when the number of iterations is In the time-course of which the first and second contact surfaces, , I.e. representing the initial conversion coefficient 。
  9. 9. The method for inversion of the girder deflection of the trestle bridge based on double-dip angle measurement according to claim 1, wherein the step S3 further comprises: Step S34, converting the conversion coefficient Substituting into the step S31, repeating the steps S31-S33 until the residual signal is obtained Satisfy the following requirements Outputting the final conversion coefficient 。
  10. 10. The method for inversion of the girder deflection of the trestle bridge based on double-dip angle measurement as claimed in claim 1, wherein the step S4 comprises: step S41, based on Instantaneous inclination angle data of quarter length position of main girder of trestle at moment And instantaneous tilt data at three-quarters of the length of the main beam of the trestle Establishing Moment trestle mid-span deflection estimation value Is calculated by the formula: ; step S42, output Moment trestle mid-span deflection estimation value 。

Description

Trestle girder deflection inversion method based on double-dip angle measurement Technical Field The invention relates to the technical field of calculation methods, in particular to a trestle girder deflection inversion method based on double-dip angle measurement. Background In structures such as large construction trestle and temporary steel temporary bridge, a displacement meter cannot be installed due to a working surface below. The method is characterized in that a double-dip angle difference method is adopted in engineering to indirectly monitor deflection, the common inversion mode has low accuracy of an empirical formula, the actual load is a multi-axis moving vehicle (non-centralized force), the systematic underestimated deflection of an inversion result reaches 20% -40%, and the safety missing report risk exists. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides a trestle girder deflection inversion method based on double-dip angle measurement. In order to solve the technical problems, the invention provides the technical scheme that the trestle girder deflection inversion method based on double-dip angle measurement comprises the following steps: Step S1, a three-dimensional finite element model of a trestle is established according to trestle design parameters, static simulation is carried out on the three-dimensional finite element model of the trestle under standard control load working conditions, simulation parameters are obtained, and initial conversion coefficients are calculated according to the simulation parameters ; Step S2, attaching a sensor on the surface of a main girder of the trestle, detecting working parameters of the trestle through the sensor, and continuously collecting the parameters of the trestle when the trestle enters a steady-state interval of effective load; step S3, performing iterative computation according to trestle parameters, wherein Obtaining effective conversion coefficient after the sub-lamination; S4, through trestle parameters and effective conversion coefficientsAnd inverting the vertical deflection of the trestle. Preferably, in the step S1, the simulation parameters include: Deflection simulation value of trestle girder midspan Instantaneous inclination simulation value at quarter length position of trestle girderInstantaneous inclination simulation value of trestle girder at three-quarter length position; Establishing initial conversion coefficients based on acquired simulation parametersIs calculated by the formula: ; calculating to obtain initial conversion coefficient 。 Preferably, in step S2, the sensor is an inclination sensor, the inclination sensor is disposed at a quarter length position of the main beam of the trestle and at a three-quarter length position of the main beam of the trestle, and the inclination sensor is used for collecting instantaneous inclination data of the main beam of the trestle. Preferably, in the step S2, the decision criterion of the steady-state interval of the payload is that the absolute values of the readings of the two tilt sensors are both greater than the preset working threshold of the tilt sensor within a continuous period of time T. Preferably, in the step S2, when the trestle enters the steady-state region of the payload, the tilt sensor acquires in real timeInstantaneous inclination angle data of quarter length position of main girder of trestle at momentAnd instantaneous tilt data at three-quarters of the length of the main beam of the trestle。 Preferably, the step S3 includes: step S31, based on the initial conversion coefficient Calculation ofMoment trestle mid-span deflection value: ; Step S32, establishing a residual signal for reflecting the deviation between the output of the current model and the physical true value based on the theoretical deflection of the trestle in the load steady state at the mid-span position of the trestle being zeroIs calculated by the formula: ; Calculating to obtain residual signals 。 Preferably, the step S3 further includes: step S33, residual error signal Convergence threshold with preset deflectionComparison is performed: If it is Then consider the initial conversion coefficientIs accurate enough to convert the initial conversion coefficientDirectly used as the final result; If it is Then the initial conversion coefficient is updated by adopting a gradient descent methodObtain the firstConversion coefficient after repeated iteration update: In the formula,For learning rate, the value range is 0.01 to 0.1, used for controlling the update speed,Is the number of iterations. Preferably, in the step S33, when the number of iterations isIn the time-course of which the first and second contact surfaces,,I.e. representing the initial conversion coefficient。 Preferably, the step S3 further includes: Step S34, converting the conversion coefficient Substituting into the step S31, repeating the steps S31-S33 until the residual