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Prediction behavior of the concentric post-tensioned anchorage zones

  • Shangda Chen (School of Civil Engineering, Changchun University of Architecture and Civil Engineering) ;
  • Linyun Zhou (School of Science, Nanjing University of Science and Technology)
  • Received : 2022.04.24
  • Accepted : 2024.04.17
  • Published : 2023.10.25
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Abstract

Methods for designing the post-tensioned anchorage zones at ultimate limit state has been specified in current design codes based on strut-and-tie models (STM). However, it is still not clear how to estimate the serviceability behavior of the anchorage zones. The serviceability is just indirectly taken into account by means of the reasonable reinforcement detailing. To address this issue, this paper is devoted to developing a modified strut-and-tie model (MSTM) to predict the behavior of concentric anchorage zones throughout the loading process. The principle of stationary complementary energy is introduced into STM at each load step to satisfy the compatibility condition and generate the unique MSTM. The structural behavior of anchorage zones can be achieved based on MSTM from loading to failure. Simplified formulas have been proposed to estimate the first cracking load, bearing capacity and maximum crack width with the consideration of the details of reinforcement bursting bars. The proposed model provides a definite method to control the bursting crack width in concentric anchorage zones. Four specimens with different bearing plate ratios have been designed and tested to validate the proposed method.

Keywords

Acknowledgement

This work was sponsored in part by 2023 Scientific research projects of the Education Department of Jilin Province of China (JJKH20231486KJ).

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