Based on two-point step-size gradient algorithm to identify existing prestress of prestressed bridges

A gradient algorithm and prestressing technology, applied in computing, computer-aided design, special data processing applications, etc., can solve the problems of frequent bridge safety accidents, shallow safety awareness, bridge safety and durability hazards, etc.

Inactive Publication Date: 2018-12-18
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0002] In recent years, our country has made a lot of efforts to control vehicle overloading. However, in order to increase efficiency, some transport personnel have shallow safety awareness and have repeatedly taken risks. The

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  • Based on two-point step-size gradient algorithm to identify existing prestress of prestressed bridges
  • Based on two-point step-size gradient algorithm to identify existing prestress of prestressed bridges
  • Based on two-point step-size gradient algorithm to identify existing prestress of prestressed bridges

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Embodiment Construction

[0076] Such as figure 1 As shown, the present invention discloses a method for identifying the existing prestress of a prestress bridge based on a two-point step gradient algorithm, comprising the following steps:

[0077] (1), m displacement sensors are arranged on the bottom surface of the bridge from the left end to the right;

[0078] (2) Measure the vertical displacement of the bridge measured by the displacement sensor under the action of the fixed load P(t)

[0079] 21) Establish the vibration differential equation of the bridge:

[0080] Consider the bridge as a single-span simply supported beam, assuming that the fixed load P(t) is located on the single-span simply supported beam, and its distance from the left end of the bridge is x p , the dynamic displacement at time t at the position x from the left end of the bridge can be measured by the displacement sensor pasted on the bottom of the bridge as y(x,t), then its vibration differential equation:

[0081]

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Abstract

The invention discloses a method for identifying the existing prestress of a prestressed bridge based on a two-point step length gradient algorithm, which comprises the following steps: 1) m displacement sensors are arranged on the bottom surface of the bridge from the left end to the right in turn; 2), measuring the vertical displacement {y}Nm*1of the bridge measured by the displacement sensor under the action of the fixed load P (t), the amplitude {q} N * 1 of prestressed bridges is calculated from the measured vertical displacement of bridges. 4) establishing the system equation T= ({S} T -1 {S} T {b}) to identify the existing prestress value of the bridge; 5), the existing prestress value T of the bridge being obtained by using a two-point step size gradient algorithm. By establishingthe mechanical mapping relationship between the existing prestress of the prestressed bridge and the vertical dynamic displacement response of the bridge, the invention realizes the identification ofthe existing prestress value of the bridge by the displacement response of the bridge, has the advantages of fast identification speed and high accuracy, and has good engineering application value.

Description

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Claims

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Application Information

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Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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