Journal
SMART STRUCTURES AND SYSTEMS
Volume 17, Issue 6, Pages 1107-1127Publisher
TECHNO-PRESS
DOI: 10.12989/sss.2016.17.6.1107
Keywords
steel truss arch bridge; railway; hanger; dynamic displacement; static displacement; dynamic load factor; correlation; monitoring
Funding
- National Basic Research Program of China (973 Program) [2015CB060000]
- National Science and Technology Support Program of China [2014BAG07B01]
- National Natural Science Foundation [51578138, 51508070]
- Program of Six Major Talent Summit Foundation [1105000268]
- Fundamental Research Funds for the Central Universities [DUT16YQ101]
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Studies on dynamic characteristics of the hanger vibration using field monitoring data are important for the design and evaluation of high-speed railway truss arch bridges. This paper presents an analysis of the hanger's dynamic displacement responses based on field monitoring of Dashengguan Yangtze River Bridge, which is a high-speed railway truss arch bridge with the longest span throughout the world. The three vibration parameters, i.e., dynamic displacement amplitude, dynamic load factor and vibration amplitude, are selected to investigate the hanger's vibration characteristics in each railway load case including the probability statistical characteristics and coupled vibration characteristics. The influences of carriageway and carriage number on the hanger's vibration characteristics are further investigated. The results indicate that: (1) All the eight railway load cases can be successfully identified according to the relationship of responses from strain sensors and accelerometers in the structural health monitoring system. (2) The hanger's three vibration parameters in each load case in the longitudinal and transverse directions have obvious probabilistic characteristics. However, they fall into different distribution functions. (3) There is good correlation between the hanger's longitudinal/transverse dynamic displacement and the main girder's transverse dynamic displacement in each load case, and their relationships are shown in the hysteresis curves. (4) Influences of the carriageway and carriage number on the hanger's three parameters are different in both longitudinal and transverse directions; while the influence on any of the three parameters presents an obvious statistical trend. The present paper lays a good foundation for the further analysis of train-induced hanger vibration and control.
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