Study On Prestress Loss Based On The Measured Data Of Long Span Continuous Rigid During Construction

Continuous rigid frame bridge become the most popular bridge among large andmedium bridges with its unique advantages. With the continuous rigid frame bridgebuilt more and more, its common diseases such as beam cracking and scratch across themiddle has brought a non-negligible impact to the development of traffic facilities inChina, and these diseases may even endanger the safety of the bridge. Continuous rigidframe bridge generally have such diseases, the main reason is the impact of the loss oftendons’ prestressing, Therefore, the study of long-span continuous rigid frame bridgeprestressed loss is an urgent need to solve the problem.This paper relies on the actual project-the new White River Bridge, By installingthe magnetic flux sensor in the roof, floor and webs of the bridge, anchor meter installedat the ends of the steel beam, we can measure the corresponding sheets of steel beamsthrough these instruments and then pulled from a bridge into the various periods of thefinal bridge operations effective prestress, resulting in the loss of value of thecorresponding stage of the prestressing, compared to the values from the currentmeasured values to the theoretical value and values of the finite element model, Inverification of finite element model of prestressed losses consistent with the theoreticalvalue, and we can verify the value of the gauge theory and measured values at the sametime. Finally, the calculation of prestressing loss of fitting parameters by regressionanalysis method, for long-span continuous rigid frame bridge, this thesis is a goodreference value.