Structural Engineering and Mechanics

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Development of strut-and-tie model and design guidelines for improved joint in decked bulb-tee bridge

  • Li, Lungui (School of Civil Engineering, Southwest Jiaotong University) ;
  • He, Zhiqi (School of Civil Engineering, Southeast University) ;
  • Ma, Zhongguo John (Department of Civil and Environmental Engineering, University of Tennessee Knoxville) ;
  • Yao, Lingkan (School of Civil Engineering, Southwest Jiaotong University)
  • Received : 2012.10.12
  • Accepted : 2013.10.02
  • Published : 2013.10.25
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Abstract

This paper focuses on a development of strut-and-tie model (STM) to predict the capacity of an improved longitudinal joint for decked bulb-tee bridge systems. Nine reinforced concrete beam/slab specimens anchored by spliced headed bars with different details were tested. Test results were evaluated and compared with an anticipation of the validated STM. The proposed STM provides a lower bound of the ultimate capacity of the joint zone. It shows that the lap length of headed bars has a significant effect on structural behaviors of the improved joint. To develop a full strength joint, the range of the lap length can be determined by the strength and compatibility requirement. Design recommendations to spliced headed bars, concrete strength, as well as lacer bars in the joint zone are proposed for developing a full strength joint.

Keywords

References

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