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A rapid evaluation method for hinge joints of hollow slab bridges based on dynamic action of moving vehicles

A hollow slab bridge and hollow slab technology, which is applied in the field of bridge hinge joint status assessment, can solve the problems of traffic interruption, hinge joint damage, and road traffic capacity being affected by the load test method, so as to improve the assessment accuracy, shorten the traffic interruption time, The effect of simple and easy detection process

Active Publication Date: 2022-03-08
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The appearance inspection method relies too much on the subjectivity of inspectors, and the internal damage of the hinge joint cannot be observed; the load test method requires a long time to interrupt traffic, which affects road traffic capacity

Method used

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  • A rapid evaluation method for hinge joints of hollow slab bridges based on dynamic action of moving vehicles
  • A rapid evaluation method for hinge joints of hollow slab bridges based on dynamic action of moving vehicles
  • A rapid evaluation method for hinge joints of hollow slab bridges based on dynamic action of moving vehicles

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Experimental program
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Embodiment

[0068] refer to figure 1 The flow chart shown, the specific process is as follows:

[0069] (1) Select a real bridge and formulate a test plan

[0070] In this example, a 20m-span assembly-type hollow slab girder bridge is selected. The main girder is composed of 11 prestressed hollow slabs. The cross-section of the main girder refers to figure 2 shown, where d 1 = 1.49m, d 2 = 1.24m, d 3 = 0.9m. In the test, a standard loaded vehicle is selected, referring to image 3 As shown, the standard loading car has a wheelbase of 3.85m between the front axle and the center axle, and a wheelbase of 1.35m between the center axle and the rear axle. Ton.

[0071] Number the hollow slabs and hinged joints sequentially (the hollow slabs are numbered from 1# to 11#, and the hinged joints are numbered from 1# to 10#). The loaded vehicles are actually loaded on the 3# and 4# hollow slabs, at a distance of d from the edge of the bridge. 4 =2.9m, refer to the numbers of hollow slabs, hi...

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Abstract

The invention discloses a method for quickly evaluating hinge joints of hollow slab bridges based on the dynamic action of moving vehicles, and relates to an evaluation method for hinge joints. Select a hollow slab bridge, number the hollow slabs and hinge joints in sequence, and arrange accelerometers and displacement meters at the mid-span position of each hollow slab; select a three-axle vehicle as the loading vehicle, and the loading speed is consistent; construct the maximum acceleration difference value index β k and the lateral partition coefficient slope D k ;Calculate the β of each joint in the as-built undamaged condition 0 and D 0 ;Calculate the β of each joint under the measured working conditions after operation 1 and D 1 ; Define the hinge joint evaluation coefficient η based on the acceleration response and the hinge joint evaluation coefficient δ based on the displacement response, and select the more serious state grade among the damage degrees corresponding to the two as the final hinge joint state evaluation result. Construct a more accurate evaluation index of the hinged joint working status, comprehensively evaluate the hinged joint status, the detection is simple and accurate, and the traffic interruption time is short.

Description

technical field [0001] The invention relates to a hinge joint evaluation method, in particular to a fast evaluation method for a hollow slab bridge hinge joint based on the dynamic action of a moving vehicle, and belongs to the technical field of bridge hinge joint state evaluation. Background technique [0002] For prefabricated hollow slab structures, the safety and durability of hinge joints play an important role in the transmission of lateral forces in the structure. However, the strength of the hinge joint will decrease with the destruction of the concrete of the hinge joint, which may make its strength lower than the design value, resulting in the inability of the assembled hollow slab to transmit the lateral force, making the structure in a dangerous state. [0003] Aiming at the current evaluation of the state of the hinged joints of hollow slabs, experts and scholars from various countries have given a variety of evaluation methods through a large number of experim...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01M5/00
CPCG01M13/00G01M5/0008G01M5/0066G01M5/0075
Inventor 李岩柳保成蒋峰刘立鹏孙航马俊
Owner HARBIN INST OF TECH
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