Measurement And Analysis Of Fatigue Of Highway Bridge

Nowadays, the traffic network of our nation still needs to build deeply, so the job of building the bridge is on the high time. The builders pay much more attention to the new bridges and pay less attention to the condition of the existing bridges. However, the existing bridges have many problems. Some of them are rather prominent. For the existing bridges, corrosion and fatigue are two major factors to control the life of bridges. Because the skills of building the bridges are limited, the fatigue problem has not been considered or considered completely. Besides, the transportafiong is increasing quickly. The transport capacity, the load of cars and the speed are all improved. These factors lead to the pessimistic condition of highway bridges which are designed according to the old criterionTo this actuality, combining the information adopted through the item of analysing the fatigue life of Nanpu Bridge's steel structure, this essay introduces the method of analysing fatigue life of highway steel bridges. First, it generally summarizes the actuality of criterions about fatigable problems of each country, then it analyzes and contrasts the methods of fatigable expectation and fatigable curve. Then collecting lots of bibliography, it summarizes the procedure that takes the traditional analytic method to analyse the fatigue life of steel bridges. It sets a theoretical base for the analyse of Nanpu Bridge's steel-girders. Combining the fatigue analyse of Nanpu Bridge, it summarizes two methods to get stress course——actual measurement method and criterion method. It also analyzes and contrasts these two methods. At last, according to the monitor system of East Sea Bridge. It builds FEM of cable-stayed bridge of main sea-rout of the East Sea Bridge and explains the disposal method of measuring points. According to the sites of measuring points, it simply analyse the fatigue of the main sea-rout bridge of the East Sea Bridge.