Researches On The Detection Of Hutiao Bridge In Guangyuan City

With the rapid development of economy in china,the construction quality and operation quality of bridge engineering arouse wide public concern.For many years,many momentous bridge accidents have happended in china,which not only caused fateful economic cosses and casualties,but caused an extremely bad influence in society.The bridge detection play an increasingly important role in ensuring the safe operation of bridges.Firstly,it is commonly believed that the bridge detection play an important role in testing the bridge’s design and construction quality,determing the reliability of engineering,underst-anding the mechanical properties of the bridge,judging the actual bearing capacity of bridge and performance evaluation of bridge structure under the design load.This paper,based on the Hutiao bridge in Guangyuan city,studied the concrete strength of beam and pier.According to the measured concrete strength,we determine whether the concrete strength of Hutiao bridge meet the corresponding standards.Based on the static load test and dynamic load test of 4 350KN truck to Hutiao bridge by unbalance loading and intermediate loading,furthermore a truck drving and jumping on the Hutiao bridge by different speeds.Bases on the different loading methods and speeds of the static load test and dynamic load test,we analysis the variation of test section strain deflection、bending and impact coefficient for evaluating the carrying capacity and working state of Hutiao bridge.The results showed that: ①The concrete strength of beam and pier of Hutiao bridge meet the relevant requirements of "Code for design of concrete structures"(GB 50010-2010). ②The strain verification ratio of 3 test conditions are less than 1.0,meeting the verification ratio provisions of "Specificatio for inspection and evaluation of load bearing capacity of highway bridge"(JTG/T J21-2011).The strain verification ratio of A-A and B-B section are in a normal range,while the strain verification ratio of C-C section is too large. ③As the speed increases,the impact of coefficient of the Hutiao bridge becomes larger by a monotonic increasing trend.