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Static loading test for supper longspan suspensionbridge with steel truss girders(PDF)

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年6期
Page:
67-76
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Static loading test for supper longspan suspensionbridge with steel truss girders
Author(s):
GUO Shuan
(Hunan Communications Research Institute Co., Ltd., Changsha 410015, Hunan, China)
Keywords:
bridge engineering suspension bridge with steel truss girder static characteristics of bridge in completed state FEA analysis static loading test
PACS:
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DOI:
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Abstract:
In order to accurately understand the mechanical properties and working state of super longspan suspension bridge with steel truss girders under the service load and estimate the achievement of the design target, the Dongting Lake Bridge with a mainspan length of 1 480 m in Hangrui Highway of Yueyang was used as the engineering background.The static loading test and theoretical analysis of the bridge were conducted to investigate the whole mechanical behavior of the longspan suspension bridge. Initially, the influence of the nonlinearity of live load effect and the temperature effect on the mechanical behavior of the bridge was investigated. Secondly, in order to improve the loading effectivity, 8 static loading scenarios were selected, based on the premise that all loading effectivity factors ηq meets the requirement of load test methods for highway bridge (JTG/T J2001—2015) (0.8≤ηq≤1.05). Finally, the changing behavior of the bridge under combined conditions with the most loading vehicles revealed, which includes the displacement of pylons, the deflection of main cables, the deflection of steel truss girders, the strand force of main cables, the sling force, the strain of the tower foot section and the longitudinal displacement of girders. In addition, the experimental results were compared to those of the numerical simulations. The results show that for the super longspan steel truss suspension bridge, the concept of influence line approach based on the linear secondorder theory is still applicable to the superposition calculation of live load effects. In the case of maximum vehicle loading condition, the variation ratio of measured values and the theory values for the pylon displacement, the deflection of main cables, the deflection of steel truss girders, the strand force the main cables (strain ) are 0.75 to 0.80、0.65 to 0.97、0.58 to 0.96、0.78 to 0.88 respectively. In addition, the maximum relative residual values are 0.04, 0.09, 0.1 and 0.04 respectively. All of the data meets the requirements, which means that the structure of the bridge has favorable overall mechanical performance and large strength safety reserve. The results of the study can provide data support for the study of the mechanical property of super longspan suspension bridges with steel truss girders. 2 tabs, 16 figs, 31 refs.

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Last Update: 2020-12-17