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

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

technical field [0001] The invention belongs to the technical field of identification of existing prestress of prestress bridges, and in particular relates to a method for identifying existing prestress of prestress bridges based on a two-point step gradient algorithm. Background technique [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 repeated prohibition of overweight and overweight vehicles has caused immeasurable harm to the safety and durability of bridges. This is also the main reason for the frequent occurrence of bridge safety accidents in our country. Compared with the advanced non-destructive testing technology in developed countries, my country's bridge structure testing technology is still at a relatively backward level. According to the development strategy of "equal emphasis on co...

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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 repeated prohibition of overweight and overweight vehicles has caused immeasurable harm to the safety and durability of bridges. This is also the main reason for the frequent occurrence of bridge safety accidents in our country.

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