Preliminary Study Of Elevated Urban Rail Transit Line Of Prestressed Concrete Beam Bridge Test Indicators

Urban rail transit viaduct line is an important part of the urban rail transit lines, which plays an important role in comprehensive operation of the urban rail transit. It is different from the municipal viaduct and railway bridge, but by now railway bridge code is the judgment standard of urban rail transit viaduct testing. In order to make preparation for formulate special testing code of pressed concrete beam bridges on urban rail transit viaduct line, this paper focus on the preliminary study of the testing norms. The main contents of this study are shown follows:1. The characteristic and development of urban transit viaduct is introduced. And the importance of the urban rail transit viaduct test and necessity of the testing is expounded. Then the history and current situation of research in urban rail transit viaduct and bridge testing is resumed.2. The related norms and code which is referred to during the testing of highway bridge, railway bridge and urban rail transit viaduct is introduced. And the evaluation of bridge's technical conditions is sketched. The qualifications of the norms are introduced. Then the limit of dynamic factor, vertical stiffness and lateral stiffness in foreign codes and standards is introduced.3. The process of bridge load testing is introduced briefly. In order to get the simulation in theory, a series of finite element models are established. The test result of the load testing for line 4 and 5 urban rail transit viaduct in guang zhou is analyzed and concluded.4. An associated program is established, which is used to calculate the vertical dynamic response of the bridge. Dynamic factor of different spans of simply supported girder is calculated from the program. The result of the program is proved by the result of load testing. A formula of dynamic factor is recommended after analyzing the result of the urban rail transit viaduct's load test.5. A pilot study about testing norms which is related to the judging of Urban rail transit viaduct's traffic serviceability is carried out. The result calculated theoretically by finite element models and the result of load testing are compared and analyzed. Then the ordinary value and limit value for traffic safety of testing norms is recommended after using the value of foreign standard for reference.