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Stress monitoring point optimal arrangement method in bridge construction process

A technology for stress monitoring and bridge construction, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as material creep fracture, achieve the effects of promoting development, simplifying layout problems, and huge social and economic benefits

Inactive Publication Date: 2011-02-16
JIANGSU TRANSPORTATION RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This deformation may even lead to creep rupture of the material

Method used

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  • Stress monitoring point optimal arrangement method in bridge construction process
  • Stress monitoring point optimal arrangement method in bridge construction process
  • Stress monitoring point optimal arrangement method in bridge construction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for optimizing the layout of stress monitoring points during bridge construction includes the following steps:

[0028] 1) First calculate the structural response of the steel truss girder and guide girder of a bridge under various working conditions, and use midas software (a finite element analysis software for structural design) to establish the overall analysis model of the steel truss girder and guide girder (see figure 1 ) was calculated. The axial stress of the bar under 8 working conditions is obtained. The above eight working conditions basically reflect the main change characteristics of the structural response during the towing process, so it is reasonable to assume that the structural response changes linearly in each time period. To simplify the problem, this example assumes that the dragging process is a uniform motion, and the dragging time is the dragging distance divided by the dragging speed.

[0029] 2) According to Calculate the danger...

Embodiment 2

[0032] The difference between this embodiment and the previous example lies in steps 2) and 3).

[0033] 2) According to Calculate the monitoring importance level value I of each member j , where D j is the hazard level of member i, i is the member number, σ i，j is the axial stress of member i under working condition j, σ i，j-1 is the axial stress of member i under the working condition j-1 before working condition j occurs, σ b is the tensile and compressive strength value of the member material, T j-1，j is the time required from the occurrence of working condition j-1 to the occurrence of working condition j in the construction process, ξ 1 is the importance coefficient (0≤ξ≤1), according to the importance of each member, select the importance coefficient ξ 1 , the higher the importance of the member, the greater the value;

[0034] 3) According to the calculated monitoring importance level value I i , select the monitoring importance level value I i Larger rods ar...

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Abstract

The invention relates to a stress monitoring point optimal arrangement method in the bridge construction process, which comprises the following steps: (1) computing the structural response of the steel trussed girder and nose girder of a certain bridge under various working conditions, establishing a global analysis model of steel trussed girder and nose girder by using midas software, and computing the axial stress of bars under j working conditions; (2) computing the danger level Di of each bar, wherein Dj is the danger level of component i, i is the number of the bar, Sigma i,j is the axial stress of the component i under the working condition j, Sigma i,j-1 is the axial stress of the component i under the working condition j-1, Sigma b is the tensile strength of the component material, and T j-1,j is the time required between the working condition j-1 and the working condition j in the construction process; (3) and according to the computer danger level Di of each bar, selecting the bar arrangement monitoring point of each bar in the high danger level Di.

Description

technical field [0001] The invention belongs to an optimization method for arranging stress monitoring points in the bridge construction process, and is especially suitable for the push (drag) construction process of steel truss girder bridges. Background technique [0002] Bridge construction is a process in which multiple load conditions are constantly changing, and there are many uncertain factors in construction. Therefore, there are many and complex items to be monitored, involving various aspects of construction, such as the stress of key structural members, the stress of multiple temporary piers A series of monitoring contents such as deformation. Not only the ever-changing load conditions increase the difficulty of rod stress monitoring, but also the difficulty lies in the fact that there is no mature theory for this problem, and there is no rule to follow. To solve this problem, it is necessary to find ) construction characteristics of ideas. [0003] Usually, the...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 朱晓文傅斌刘冠国邢丹丹胡云辉
Owner JIANGSU TRANSPORTATION RES INST CO LTD
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