Incremental cable adjusting method considering cable-beam temperature difference effect for concrete cable-stayed bridge

Abstract

The invention discloses an incremental cable adjusting method considering the cable-beam temperature difference effect for a concrete cable-stayed bridge. The incremental cable adjusting method comprises the following steps: finite element analysis of the overall concrete cable-stayed bridge, cable force and temperature measurement, cable force conversion considering temperature, and incremental cable adjustment; before cable adjustment, a time period during which the temperature is relatively stable is selected, the cable force and the cable-beam temperature of the overall bridge are measured, and the cable force of the overall bridge equated at the temperature of 20 DEG C is taken as the reference cable force for cable adjustment; during the cable adjustment process, the increment of the cable force is taken as the controlled quantity, the most sensitive cross section displacement value of the main span is taken as the verification quantity; after completion of all the processes, the cable-beam temperature and the most sensitive cross section displacement value of the main span are measured in real time; in order to ensure that the mechanical behavior of the overall bridge is within a controlled range, the cable force of the overall bride is re-measured after forces of 1 / 3, 2 / 3 and all of the stay cables are adjusted, the cable force acquired after temperature correction is compared with the theoretical calculating value, and the result shows that the incremental cable adjusting precision is ideal and quite high in efficiency.

Description

technical field [0001] The invention relates to the construction process of a concrete cable-stayed bridge and the adjustment of the cable force at the completion stage of the bridge, in particular to an incremental cable adjustment method of the concrete cable-stayed bridge considering the temperature difference effect of the cable-beam. Background technique [0002] The frequency method is widely used in the cable force test of cable-stayed bridges, but many engineering practices show that the actual test cable force value is difficult to match the theoretical value. On the one hand, the identification of cable parameters is not accurate enough; The temperature field cannot be considered or the consideration is not accurate enough. The parameters required for the cable force test are usually derived from the design drawings and the construction site, and when necessary, they need to be determined by means of experiments. In the on-site cable force test, few people pay att...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, provide a kind of incremental cable adjustment method for concrete cable-stayed bridges considering the temperature difference effect of cable girders, and overcome the occurrence of cable force adjustment values ​​caused by temperature effects in the prior art. deviation, thus affecting the accuracy of cable adjustment

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