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Method for rapidly extracting midspan displacement influence lines of three-axis vehicle slowly passing through continuous beam bridge

A technology of displacement influence line and extraction method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the inability to clearly obtain the theoretical value of the displacement influence line, the slowness of the three-axle vehicle, and the unclear mechanics concept.

Active Publication Date: 2020-09-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention is to solve the problem that the mechanical concept of the existing quasi-static load test method is not clear, and the theoretical value of the displacement influence line cannot be clearly obtained, and provides a method for quickly extracting the displacement influence line of a three-axle vehicle slowly passing through the mid-span of a continuous beam bridge. This method clarifies the rapid assessment method of continuous beam bridge state based on displacement influence line, and the mechanical concept is clear

Method used

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  • Method for rapidly extracting midspan displacement influence lines of three-axis vehicle slowly passing through continuous beam bridge
  • Method for rapidly extracting midspan displacement influence lines of three-axis vehicle slowly passing through continuous beam bridge
  • Method for rapidly extracting midspan displacement influence lines of three-axis vehicle slowly passing through continuous beam bridge

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specific Embodiment approach 1

[0086] Specific embodiment 1: This embodiment records a method for quickly extracting the displacement influence line of a three-axle vehicle slowly passing through the mid-span of a continuous girder bridge. The driving speed of the vehicle is less than 5 km / h, and the method is specifically as follows:

[0087] For the corresponding three-axle truck, the axle loads of the front axle, middle axle and rear axle are P / 5, 2P / 5, 2P / 5 respectively, the total weight is P, and the distance between the front axle and the middle axle is s 1 , the distance between the central axis and the rear axle is s 2 ;The distance x from the front axle to the left fulcrum of the bridge 1 =x, the distance from the central axis to the left fulcrum of the bridge x 2 =x-s 1 , the distance from the rear axle to the left fulcrum of the bridge x 3 =x-s 1 -s 2 ;

[0088] The mid-span vertical displacement formula is as follows:

[0089] Ⅰ.x1

[0090]

[0091] Ⅱ.s 1

[0092]

[0093] Ⅲ...

Embodiment 1

[0151] An example of a three-axle truck passing slowly over a bridge: a three-span concrete continuous girder bridge with a span layout of 3×40m, the calculated span is l=40m; a three-axle truck passes slowly through the bridge, and the total vehicle weight is P=300kN, corresponding to The weights of the front axle, central axle and rear axle are 60kN, 120kN, 120kN respectively, and the wheelbase between the front axle and the central axle is s 1 =4m, the wheelbase between the middle axle and the rear axle is s 2 = 1.4m. The specific implementation steps are as Figure 13 shown.

[0152] Displacement sensors are arranged across the cross-section, and the displacement curve in the mid-span is as follows: Figure 14 As shown, the mid-span displacement influence line obtained after separation by this method is as follows Figure 15 As shown, through the finite element model analysis, the theoretical value of the mid-span displacement influence line is as follows Figure 16 A...

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Abstract

The invention discloses a method for rapidly extracting midspan displacement influence lines of a three-axis vehicle slowly passing through a continuous beam bridge, and belongs to the technical fieldof bridge detection methods. According to the method, displacement curves under the action of three axles can be rapidly converted into structural influence lines, the structural influence lines canbe directly compared with theoretical values, the operability is improved, and then rapid and accurate evaluation of the bridge state is achieved. According to the method, the midspan displacement curve actually measured on site is effectively separated and compared with the theoretical influence line, and then rapid evaluation work of the technical state of the bridge can be achieved. By means ofthe method, the technical problem that in the quasi-static load test process, theoretical values are not easy to obtain during data processing, and consequently the theoretical values cannot be compared with measured values can be effectively solved. Compared with the modes of integration, filtering and the like, the method is more easily accepted by engineers, and the result can be obtained through simple editing such as Excel and the like, so that the method can be used as an effective method for quickly extracting the midspan displacement influence line of the continuous beam bridge.

Description

technical field [0001] The invention belongs to the technical field of bridge detection methods, and in particular relates to a method for quickly extracting displacement influence lines of a three-axle vehicle slowly passing through the mid-span of a continuous girder bridge. Background technique [0002] According to the "Statistical Bulletin on the Development of the Transportation Industry in 2019", as of the end of 2019, my country has built about 878,300 road bridges, and has become a veritable bridge country. With the vigorous development of my country's transportation industry, the safety of bridge structures is the key to communication across the board. However, with the increase of the service time of existing bridges, the continuous increase of traffic load and the long-term effect of natural environmental factors, as well as the update of design codes in different periods, most of the small and medium-span bridges bear the influence of high vehicle load effects, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/13G06F111/10G06F119/14
CPCG06F30/13G06F30/20G06F2111/10G06F2119/14
Inventor 高庆飞武彪刘洋刘锋李虎
Owner HARBIN INST OF TECH