Research on interface stress of UHPCTPO forlightweight composite bridge decks(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年4期
- Page:
- 56-64
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Research on interface stress of UHPCTPO forlightweight composite bridge decks
- Author(s):
- LI Jia1; 2; LIU Kai1; 3; WANG Yang1; 2
- (1. School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Key Laboratory forWind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, Hunan, China；3. Power China Zhongnan Engineering Corporation Limited, Changsha 410082, Hunan, China )
- Keywords:
- bridge engineering; composite bridge deck; ultrahigh performance concrete; nonlinear; finite element method; interface stress
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to investigate the mechanical response of UHPCTPO overlay after the lightweight composite bridge deck entering nonlinear stage, a nonlinear finite element model of steelUHPCTPO overlay was established based on a composite plate test. The midspan loaddisplacement curves calculated by simulation was in good agreement with the test results. On this basis, the analysis of the whole process of bending of the composite plate was carried out, and the stress distributions characteristics of the UHPCTPO overlay rigidflexible structure were emphasized. Furthermore, the influence of the linear and the nonlinear model on calculation results was compared. The results show that elastic limit load and the equivalent load is the limit load of 19.8% and 28.5% respectively, under the equivalent load combination plate loading into nonlinear. When the friction coefficient between surface layer and UHPC layer is set at 4.0, it is closer to the real interlayer state. The horizontal shear stress and normal stress at room temperature are 20.3% and 37.4% lower than those calculated by the completely continuous model, and 13.6% and 31.6% lower than those calculated by the completely continuous model at high temperature respectively. The calculated shear stress of the linear bridge segment model is 5.0% higher than that of the nonlinear model at room temperature and 4.0% lower than that of the nonlinear model at high temperature. It is suggested that the linear completely continuous model is used to calculate the stress between the thin layer and UHPC layer in practical engineering design. 5 tabs, 12 figs, 23 refs.
Last Update: 2021-08-12