Arch bridge deflection monitoring method based on temperature influence correction
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An arch bridge and temperature value technology, which is applied in the field of arch bridge deflection monitoring based on temperature influence correction, can solve the problems of not eliminating the influence of light temperature difference, etc., and achieve the effect of safe test environment
Active Publication Date: 2021-07-16
广西北投交通养护科技集团有限公司 +1
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Although the above scheme provides a measurement scheme for the deflection of the main arch rib, it still does not eliminate the influence of temperature difference caused by light. In particular, the operation of this scheme can only be carried out during the day. Is the influence of temperature difference obvious?
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[0073] A method for monitoring the deflection of an arch bridge based on temperature influence correction, mainly a method for monitoring the deflection of an arch rib of a steel box or steel pipe arch bridge, comprising the following steps:
[0074] Step 1, the time is t 1 When , measure the temperature value T of the upper, lower, left, and right measuring points of any cross-section of the rib 1 ,T 1 is a temperature sequence; measure the elevation or coordinate Δ of the arch rib of the arch bridge 1 ,Δ 1 It is an elevation or coordinate sequence, and a high-precision measurement robot is used for elevation or coordinate measurement. The measurement points of elevation or coordinates are arranged at L / 8, L / 4, 3L / 4, L / 2, 5L / 8, 6L / 8. 7L / 8 places;
[0075] Step 2, the time is t 2 When the time or load changes, measure the temperature value T of the measurement points at the top, bottom, left and right sides of any section of the rib 2 ,T 2 As a temperature sequence, me...
example
[0091] For a steel box arch bridge with a main span of 150m, deflection measuring point 1, measuring point 2, and measuring point 3 are distributed at L / 2, 7L / 8, and 6L / 8, and the time is t 1 When the equivalent temperature is 20°C, the vertical coordinates of measuring point 1, measuring point 2 and measuring point 3 are Δ 1 They are 99.548m, 99.354m, 99.158m respectively; the time is t 2 When the equivalent temperature is 28°C, the vertical coordinates of measuring point 1, measuring point 2 and measuring point 3 are Δ 1 They are 99.598m, 99.396m, and 99.188m respectively; according to the finite element calculation, the deflection under the equivalent temperature of measuring point 1, measuring point 2 and measuring point 3 is respectively 0.015m, 0.009m, and 0.006m. 1. The theoretical calculation deflection of measuring point 2 and measuring point 3 is 0.055m, 0.045m, 0.030m respectively; find the Δ of measuring point 1, measuring point 2 and measuring point 3 b They are...
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Abstract
The invention discloses an arch bridge deflection monitoring method based on temperature influence correction, which is mainly a method for high-precision monitoring of arch rib deflection of a steel box or steel tube arch bridge, and comprises the following steps: step 1, when time is t1, measuring temperature values T1 of upper, lower, left and right measuring points of any section of an arch rib, and measuring elevation or coordinate delta 1 of the arch rib of the arch bridge; 2, measuring temperature values T2 of upper, lower, left and right measuring points of any cross section of the rib when the time is t2 or after the load is changed, and measuring the elevation or coordinate delta2 of the arch bridge rib; 3, when the time is t1 and t2, the equivalent overall temperature acts on the relative elevation or coordinate delta 3 of the arch rib under the action of sunlight change; and 4, calculating the actually measured real deflection value delta = delta2-delta1-delta3 of the main arch rib after the sunlight temperature influence is eliminated under the load effect. According to the method, the influence of sunlight irradiation temperature difference on the deflection of the main arch rib is eliminated, the deflection measurement precision of the arch rib is improved, and fine evaluation of the stress technical condition of the arch rib is facilitated.
Description
technical field [0001] The invention belongs to the technical field of bridge monitoring, and in particular relates to an arch bridge deflection monitoring method based on temperature influence correction. Background technique [0002] In order to grasp the technical status of the bridge and understand its bearing capacity, it is very necessary to inspect or monitor the bridge regularly, and the load test is the most direct way to judge the bearing capacity of the bridge. The deflection of the main arch rib is a very important basis for judging during the test One, so it is necessary to accurately measure the deflection of the main arch rib. [0003] Usually, due to the long-term exposure of the steel box or steel pipe arch rib to the outdoor environment, the temperature field on its surface is inevitably affected by the external environment, especially under the action of light, the temperature distribution of the round steel pipe member is non-uniform. As the lighting con...
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