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.
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[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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