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Structural Engineering and Mechanics
  Volume 48, Number 2, October25 2013 , pages 221-239

Development of strut-and-tie model and design guidelines for improved joint in decked bulb-tee bridge
Lungui Li, Zhiqi He, Zhongguo John Ma and Lingkan Yao

    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.
Key Words
    lap length; headed reinforcement; joint zone; strut-and-tie model; accelerated construction
Lungui Li, Lingkan Yao : School of Civil Engineering, Southwest Jiaotong University, 111 Erhuan Rd. North 1 Section, Chengdu, 610031, China
Zhiqi He : School of Civil Engineering, Southeast University, 2 Sipailou, Nanjing, 210096, China
Zhongguo John Ma : Department of Civil and Environmental Engineering, University of Tennessee Knoxville, 223 Perkins Hall, Knoxville, 37996-2010, USA

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