Bridge floor multi-axis moving load recognition method based on diagonal relaxation orthogonal projection iterative algorithm

An orthogonal projection and iterative algorithm technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as inability to recognize multi-axis vehicle loads, and achieve the effect of avoiding the reduction of recognition accuracy, improving recognition accuracy, and good feasibility.

Inactive Publication Date: 2017-06-20
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0005] The existing moving load identification technology is mostly aimed at identifying conventional two-axle vehicles, but cannot identify multi-axle vehicle loads. Therefore, there is an urgent need for a method that can identify multi-axle moving vehicle loads on bridge decks.

Method used

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  • Bridge floor multi-axis moving load recognition method based on diagonal relaxation orthogonal projection iterative algorithm
  • Bridge floor multi-axis moving load recognition method based on diagonal relaxation orthogonal projection iterative algorithm
  • Bridge floor multi-axis moving load recognition method based on diagonal relaxation orthogonal projection iterative algorithm

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Embodiment Construction

[0056] Such as figure 1 As shown, the present invention discloses a method for identifying multi-axis moving loads on a bridge deck based on a diagonally relaxed orthogonal projection iterative algorithm, including the following steps:

[0057] 1) Corresponding position x on the bottom of the bridge1 ,x 2 ,...x m Paste m displacement sensors at each position, and measure the multi-axis moving vehicle load f on the bridge deck k (t) The displacement at time t at position x is v(x, t), k=1, 2, 3... is the number of vehicle axles;

[0058] 2) Establish the vibration differential equation of the vehicle-bridge system: take the length of the bridge as L, the bending stiffness as EI, the mass per unit length of the bridge as ρ, consider the viscous damping and take the damping coefficient as C, and ignore the shear deformation and moment of inertia of the bridge. Multi-axle moving vehicle load on the bridge deck f k (t) Move to the right from the support at the left end of the b...

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Abstract

The invention discloses a bridge floor multi-axis moving load recognition method based on the diagonal relaxation orthogonal projection iterative algorithm. The method includes the following steps that firstly, m displacement sensors are attached to corresponding positions x1, x2,..., xm on the bottom face of a bridge, and the displacement of a bridge floor multi-axis moving vehicle load fk(t) at the x position at the t moment is v(x,t), wherein k is 1,2,3,..., and k is the number of vehicle axles; secondly, an oscillatory differential equation is established; thirdly, the equation (1) is solved; fourthly, a multi-axis moving load system equation recognized by displacement responses is established for the bridge under the k-axis vehicle load action; fifthly, the precise value of a multi-axis moving load is solved through the diagonal relaxation orthogonal projection iterative algorithm. The multi-axis moving load can be recognized by measuring the bridge displacement responses only, the recognition method is simple, precision is high, feasibility is good, and the method can be widely applied to moving load recognition of various types of bridges.

Description

technical field [0001] The invention belongs to the technical field of bridge deck moving load identification, in particular to a method for identifying bridge deck multi-axis moving loads based on bridge displacement. Background technique [0002] The status quo of bridges in our country is "reconstruction and light maintenance". From 1999 to 2013, domestic media publicly reported that there were more than 110 bridges in my country that collapsed due to various reasons, which did not include bridge collapses caused by the Wenchuan earthquake. The causes of bridge damage and destruction can be summarized as external factors and internal factors. Among them, the fatigue damage and durability reduction of the bridge due to vehicle overload are dominant in the external factors, while the internal factors are mainly the reduction of the bearing capacity of the bridge itself and the degradation of material strength. [0003] With the explosive growth of highway traffic in our cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 陈震
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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