Engineering Mechanics ›› 2018, Vol. 35 ›› Issue (8): 46-54.doi: 10.6052/j.issn.1000-4750.2017.04.0272

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TEMPERATURE EFFECTS ON THE MID-SPAN VERTICAL DISPLACEMENT OF A CABLE-STAYED BRIDGE

ZHOU Yi1, SUN Li-min2, XIE Mo-wen1   

  1. 1. Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
  • Received:2017-04-09 Revised:2017-09-08 Online:2018-08-29 Published:2018-08-29

Abstract: The mid-span vertical displacement is an important index in structural health monitoring, and it changes considerably with the temperature variation. Based on field measurements of the Shanghai Yangtze River Bridge (SYRB), this study investigated the mechanisms of temperature effects on the mid-span vertical displacement of two-tower cable-stayed bridges through the plane geometric analysis and the finite element analysis, with the purpose of understanding the behavior of such bridges. It is found that the thermally induced mid-span vertical displacement (DT) does not vary monotonously with the temperature of atmosphere or a particular structural component. The DT could be well approximated by a multiple linear superposition of thermal expansion effects of the cable temperature (CT), girder average temperature (GAT), differential temperature between top and bottom plates of the girder (GDT), and tower average temperature (TT). For SYRB, the effects of CT and GAT on the variation of DT are almost one order greater than those of the GDT and TT, and the direction that DT takes in response to CT is opposite to that of the other three temperatures. The simplified plane geometric model proposed in this paper is able to estimate the DT of cable-stayed bridges preliminarily.

Key words: cable-stayed bridge, temperature effect, mechanism, mid-span vertical displacement, structural health monitoring

CLC Number: 

  • U448.27
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