Method for quickly extracting midspan displacement influence lines of double-axle vehicle slowly passing through continuous beam bridge

A displacement influence line and vehicle technology, applied in special data processing applications, measuring devices, elasticity testing, etc., can solve the problems of slow dual-axle vehicles, unclear mechanics concepts, and difficulty in accurately obtaining the measured values ​​of the influence line, etc. Increased operability, clear effect of mechanics concept

Active Publication Date: 2020-09-15
HARBIN INST OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the mechanical concept of the current quasi-static load test is not clear and it is difficult to accurately obtain the measured value of the influence line, and provide a method for quickly extracting the displacement influence line of the double-axle vehicle slowly passing through the mid-span of the continuous beam bridge

Method used

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  • Method for quickly extracting midspan displacement influence lines of double-axle vehicle slowly passing through continuous beam bridge
  • Method for quickly extracting midspan displacement influence lines of double-axle vehicle slowly passing through continuous beam bridge
  • Method for quickly extracting midspan displacement influence lines of double-axle vehicle slowly passing through continuous beam bridge

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specific Embodiment approach 1

[0066] Specific Embodiment 1: This embodiment records a method for quickly extracting the displacement influence line of a two-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:

[0067] For a two-axle truck, the axle loads of the front axle and the rear axle are P / 2 respectively, the total weight is P, and the wheelbase is s; the distance from the front axle to the left fulcrum of the bridge is x 1 =x, the distance x from the rear axle to the left fulcrum of the bridge 2 =x-s;

[0068] The mid-span vertical displacement formula is as follows:

[0069] Ⅰ.x

[0070]

[0071] Ⅱ.s

[0072]

[0073] Ⅲ. l

[0074]

[0075] IV.

[0076]

[0077] V.

[0078]

[0079] VI.

[0080]

[0081] VII.2l

[0082]

[0083] Ⅷ.2l+s

[0084]

[0085] In the above formula, f 0 (x) is the vertical displacement a...

Embodiment 1

[0115] Two-axle trucks pass slowly across the bridge: for a three-span concrete continuous girder bridge with a span layout of 3×40m, the calculated span is l=40m; two-axle trucks pass slowly through the bridge, and the total vehicle weight is P=300kN, corresponding to The weights of the front axle and the rear axle are both P / 2=150kN, and the wheelbase s=3m. The specific implementation steps are as follows Figure 9 shown.

[0116] Displacement sensors are arranged across the cross-section, and the displacement curve in the mid-span is as follows: Figure 10 As shown, the mid-span displacement influence line obtained after separation by this method is as follows Figure 11 As shown, through the finite element model analysis, the theoretical value of the mid-span displacement influence line is as follows Figure 12 As shown, comparing the two, the relative error is as Figure 13 As shown, it can be seen that for the section near the fulcrum, due to the small value of the d...

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Abstract

The invention discloses a method for quickly extracting midspan displacement influence lines of a double-axle vehicle slowly passing through a continuous beam bridge, and belongs to the technical field of bridge detection methods. The method for quickly and accurately evaluating the state of the continuous beam bridge based on the displacement influence line is defined, the displacement curve under the action of the double-axle vehicle is quickly converted into the structure influence line, the structure influence line can be directly compared with a theoretical value, the operability is improved, and the mechanical concept is clear. 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 of the method, the technical problem that in the quasi-static load test process, theoretical values are noteasy to obtain during data processing, and consequently the theoretical values cannot be compared with measured values can be effectively solved.

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 two-axle vehicle slowly passing through the middle 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 service time of existing bridges, the continuous increase of traffic load and the long-term effects of natural environmental factors, as well as the update of design codes in different periods, most bridges with small and medium Overload operation will degrade the carrying capacity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/23G01M5/00G01M99/00G06F111/10G06F119/14
CPCG01M5/0008G01M5/0075G01M99/007G06F30/13G06F30/23G06F2111/10G06F2119/14
Inventor 高庆飞武彪刘洋刘锋李虎
Owner HARBIN INST OF TECH
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