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Anchorage zone behavior and strength prediction of high-performance concrete containing coarse aggregate confined with spirals
High-performance concrete containing coarse aggregate (HPC-CA) has superior cost efficiency and reduced early cracking risk compared with traditional UHPC. HPC-CA is distinguished by high strength, lightweight, superior durability and rapid growth of early strength, presenting promising in prefabricated industry and prestressed structures. However, extreme brittleness will generate non-ductile failures, thus spiral secondary reinforcement is usually used to improve ductility. Certain differences existed between HPC-CA and ordinary-strength concrete in microstructure and macroscopic mechanical properties, and the existing code provisions cannot be directly applied to HPC-CA. Some fundamental knowledge gaps need to be filled to improve understanding of the post-tensioned HPC-CA structures, including the anchorage zone behaviors of HPC-CA confined with spirals as well as the establishment of bearing capacity calculation methods. For this purpose, 10 specimens were designed and tested under local pressure based on the unbonded prestressed concrete slabs. The cracking patterns, failure characteristics, load–deformation relationships, load–spiral strain curves and wedge features were obtained. Besides, a calculation equation was developed to predict the local bearing capacity of HPC-CA with spirals. Meanwhile, a general bearing capacity prediction model serving the anchorage zone design was established and verified with the tested results and specification formulas.
Anchorage zone behavior and strength prediction of high-performance concrete containing coarse aggregate confined with spirals
High-performance concrete containing coarse aggregate (HPC-CA) has superior cost efficiency and reduced early cracking risk compared with traditional UHPC. HPC-CA is distinguished by high strength, lightweight, superior durability and rapid growth of early strength, presenting promising in prefabricated industry and prestressed structures. However, extreme brittleness will generate non-ductile failures, thus spiral secondary reinforcement is usually used to improve ductility. Certain differences existed between HPC-CA and ordinary-strength concrete in microstructure and macroscopic mechanical properties, and the existing code provisions cannot be directly applied to HPC-CA. Some fundamental knowledge gaps need to be filled to improve understanding of the post-tensioned HPC-CA structures, including the anchorage zone behaviors of HPC-CA confined with spirals as well as the establishment of bearing capacity calculation methods. For this purpose, 10 specimens were designed and tested under local pressure based on the unbonded prestressed concrete slabs. The cracking patterns, failure characteristics, load–deformation relationships, load–spiral strain curves and wedge features were obtained. Besides, a calculation equation was developed to predict the local bearing capacity of HPC-CA with spirals. Meanwhile, a general bearing capacity prediction model serving the anchorage zone design was established and verified with the tested results and specification formulas.
Anchorage zone behavior and strength prediction of high-performance concrete containing coarse aggregate confined with spirals
Archiv.Civ.Mech.Eng
Li, Sheng (Autor:in) / Zheng, Wenzhong (Autor:in) / Zhou, Wei (Autor:in) / Li, Ruisen (Autor:in) / Qiu, Xianyelin (Autor:in)
31.10.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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