Effect of encased concrete on section temperature gradient of corrugated steel web box girder

Abstract

Thirty-two temperature sensors, a solar radiation sensor, wind speed, and direction sensor were installed on the bridge for the field monitoring of structural temperature, solar radiation, and wind. The frequency was set at 60 min for 211 days. Empirical equations were used to predict the maximum vertical and lateral temperature gradients, and the daily maximum and minimum mean temperatures of the corrugated steel web box girder. The results showed that the temperature gradient of the corrugated steel web box girder was closely related to the temperature gradient of air. The vertical maximum temperature gradient occurred at 4 pm. The height of the box girder had a significant effect on the accuracy of the predicted vertical maximum temperature gradient. Compared with the section without encased concrete, the maximum temperature gradient of the encased concrete section was reduced by 10.48%. Encased concrete showed minimal effect on both the vertical and lateral temperature gradient of the top plate part, however, the effect on the vertical temperature gradient of the haunch reduced by 17.19%. The maximum temperature gradient of corrugated steel with a composite encased concrete section was 4.12°C, which was less than that of the section without encased concrete at 5.06°C. The encased concrete had a significant effect on the maximum temperature gradient of corrugated steel web with a 26.99% deviation.

Experimental and numerical investigation on the temperature distribution of composite box‐girders with corrugated steel webs

“…The dimensions of the composite box girder are designed on basis of Xiaoqing River No. 3 bridge, 31 as shown in Figure 18a. The height and width of the girder are 12.75 and 7.00 m, respectively.…”

“…Lots of investigations have been conducted to explore the impacts of environmental factors on the temperature distributions in concrete, 8–13 steel, 14–20 and composite bridges 21–31 . Abid et al 8 conducted an experimental investigation on a full‐scale box‐girder segment for one and a half years.…”

“…The temperature variation characteristics during heating and cooling process were obtained and a refined numerical model was developed for the thermal analysis. Zhang et al 31 proposed empirical equations for predicting the maximum vertical and lateral temperature gradient of the composite box‐girder, and the daily maximum and minimum mean temperature through the experimental investigation.…”

“…Lots of investigations have been conducted to explore the impacts of environmental factors on the temperature distributions in concrete, [8][9][10][11][12][13] steel, [14][15][16][17][18][19][20] and composite bridges. [21][22][23][24][25][26][27][28][29][30][31] Abid et al 8 conducted an experimental investigation on a full-scale box-girder segment for one and a half years. Several empirical equations were obtained by regression analysis for predicting the cross-sectional maximum vertical and horizontal temperature differences in concrete box-girders.…”

Temperature behaviors of an arch bridge through integration of field monitoring and unified numerical simulation

“…The temperature variation in bridge components considerably affects the deformation of the bridge. Furthermore, thermal stresses are typically generated due to the redundancy of the structure, the restriction of movement by bearings and expansion joints, and the nonuniform temperature distribution throughout the bridge (Xu et al, 2010;Xia et al, 2012Xia et al, , 2017Zhou and Yi, 2013;Westgate et al, 2015;Zhao et al, 2019;Han et al, 2022;Zhang et al, 2021aZhang et al, , 2021bZhou et al, 2022).…”