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Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study
Chenguang Wang1, Yaowen Wu2, Yuanhai Zhang1
1School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Materials (Basel, Switzerland)
|March 28, 2024
Summary
This study introduces a new method to analyze distortion in ultra-high performance concrete (UHPC) box girders, finding UHPC reduces distortion effects and enhances bridge stability compared to normal concrete.
Area of Science:
- Structural Engineering
- Materials Science
- Civil Engineering
Background:
- Distortion deformation poses a significant risk to bridge safety.
- Understanding these effects on thin-walled structures like ultra-high performance concrete (UHPC) box girders is crucial.
Purpose of the Study:
- To comprehensively analyze the distortion effects on thin-walled UHPC box girders.
- To introduce an innovative analytical approach for distortion analysis.
Main Methods:
- Developed an analytical method based on the governing distortion differential equation.
- Validated results against energy methods and experimental data.
- Created a finite element model using ANSYS Shell 63 elements.
Main Results:
- Analytical and numerical results showed good agreement with experimental data.
- Distortion angle stabilizes around 1/10th of the span from mid-span.
- Increased web thickness reduces distortion; decreased wall thickness mitigates transverse bending moments.
Conclusions:
- UHPC box girders exhibit reduced distortion angles compared to normal-strength concrete girders.
- Findings provide engineers with enhanced understanding for improved UHPC girder design and stability.
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