Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Author:

Wang Chenguang1ORCID,Wu Yaowen2,Zhang Yuanhai1,Tang Shiying2,Li Weiwen2ORCID,Wang Peng2ORCID,Mansour Walid23ORCID

Affiliation:

1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

2. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China

3. Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 6860404, Egypt

Abstract

Distortion deformation usually imposes a potential threat to bridge safety. In order to comprehensively understand the distortion effect on thin-walled ultra-high performance concrete (UHPC) box girders, an innovative approach encompassing the governing distortion differential equation is introduced in this study based on the general definition of distortion angle within the cross-section plane. The analytical results obtained from the proposed method are in accordance with those obtained from the energy method, and exhibit favorable agreement with experimental findings documented in the existing literature. Furthermore, a finite element model is developed on the ANSYS 2021 R1 software platform with the employment of a Shell 63 element. Numerical outcomes are also in good agreement with the experimental data, affirming the validity and reliability of the findings. In addition, parameter analysis results indicate that the distortion angle remains approximately constant at a location approximately 1/10 of the span from the mid-span cross-section of the box girder, regardless of changes in the span-to-depth ratio. Increasing the web thickness yields a notable reduction in the distortion effects, and decreasing the wall thickness can effectively mitigate the distortion-induced transverse bending moment. Compared with normal-strength concrete box girders, UHPC box girders can reduce the distortion angle within the span range, which is beneficial for maintaining the overall stability of the box girders. The outcomes obtained from this study yield engineers an enhanced understanding of distortion effect on the UHPC girder performance.

Funder

National Natural Science Fund of China

Science and Technology Project of Sichuan Province

Shenzhen Natural Science Fund

Shenzhen University Young Faculty Research Start-up Project

Publisher

MDPI AG

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