TY - JOUR
T1 - 3D temperature gradient effect on a steel–concrete composite deck in a suspension bridge with field monitoring data
AU - Wang, Da
AU - Liu, Yongming
AU - Liu, Yang
N1 - Funding Information:
The research described in this paper was financially supported by the Traffic Department of Applied Basic Research Project (2015319825120), the National Basic Research Program of China (973 Program, 2015CB057701), and the Natural Science Foundation of China (51308071 and 51378081).
Publisher Copyright:
Copyright © 2018 John Wiley & Sons, Ltd.
PY - 2018/7
Y1 - 2018/7
N2 - Spatial and temporal temperature variations are critical for the accurate stress analysis of a suspension bridge with a steel–concrete composite deck system. This issue has been widely investigated in recent years in the open literature. In current codes, only the vertical temperature gradient (VTG) is considered in the thermal stress calculation. A complete 3D temperature profile has rarely been investigated. In the proposed study, the Aizhai Suspension Bridge with a steel–concrete composite deck system in China was investigated to determine the realistic 3D temperature-gradient distributions and their effects on the structural performance using a finite element method. First, the distributions of the spatial-temperature gradient including the VTG, the transversal temperature gradient (TTG), and the longitudinal temperature gradient (LTG) were investigated based on a structural health monitoring system. The results showed that the values of these gradients were far greater than those suggested by the Chinese code. Next, a 3D finite element model was proposed to investigate the thermal stress variation in the steel–concrete composite bridge deck system. The thermal-induced stresses due to the VTG, TTG, and LTG were obtained using the monitored temperature data and the proposed 3D finite element model. The coupling effects of the 2D (coupling of the VTG and TTG) and 3D (coupling of the VTG, TTG, and LTG) temperature gradients were obtained and compared with those of the 1D approximation and Chinese code. Possible reasons for the 3D temperature-gradient effect were also discussed. Following this, conclusions and recommendations for future bridge analysis and design were provided based on the proposed study.
AB - Spatial and temporal temperature variations are critical for the accurate stress analysis of a suspension bridge with a steel–concrete composite deck system. This issue has been widely investigated in recent years in the open literature. In current codes, only the vertical temperature gradient (VTG) is considered in the thermal stress calculation. A complete 3D temperature profile has rarely been investigated. In the proposed study, the Aizhai Suspension Bridge with a steel–concrete composite deck system in China was investigated to determine the realistic 3D temperature-gradient distributions and their effects on the structural performance using a finite element method. First, the distributions of the spatial-temperature gradient including the VTG, the transversal temperature gradient (TTG), and the longitudinal temperature gradient (LTG) were investigated based on a structural health monitoring system. The results showed that the values of these gradients were far greater than those suggested by the Chinese code. Next, a 3D finite element model was proposed to investigate the thermal stress variation in the steel–concrete composite bridge deck system. The thermal-induced stresses due to the VTG, TTG, and LTG were obtained using the monitored temperature data and the proposed 3D finite element model. The coupling effects of the 2D (coupling of the VTG and TTG) and 3D (coupling of the VTG, TTG, and LTG) temperature gradients were obtained and compared with those of the 1D approximation and Chinese code. Possible reasons for the 3D temperature-gradient effect were also discussed. Following this, conclusions and recommendations for future bridge analysis and design were provided based on the proposed study.
KW - 3D temperature gradient
KW - FE method
KW - field monitoring
KW - steel–concrete composite deck
KW - thermal-induced stress
UR - http://www.scopus.com/inward/record.url?scp=85045749942&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045749942&partnerID=8YFLogxK
U2 - 10.1002/stc.2179
DO - 10.1002/stc.2179
M3 - Article
AN - SCOPUS:85045749942
SN - 1545-2255
VL - 25
JO - Structural Control and Health Monitoring
JF - Structural Control and Health Monitoring
IS - 7
M1 - e2179
ER -