Title:
Post-Tensioning Effect of Segmented and Monolithic Reactive Powder Concrete Shell-Arch Member
Author(s):
Suhaib S. Abdulhameed, Rana H. Alkerwei, and Ashraf A. Alfeehan
Publication:
Structural Journal
Volume:
120
Issue:
2
Appears on pages(s):
77-90
Keywords:
arch; post-tensioning; reactive powder concrete (RPC); segmented structure; thin shell
DOI:
10.14359/51738349
Date:
3/1/2023
Abstract:
This study adopted the concept of minimizing the materials and improving the structural system in terms of using a fiber-reinforced, prestressed member, geometrical form, and thin section along with the segmental construction. Five shallow thin reactive powder concrete (RPC) shell arches were fabricated and tested to investigate the post-tensioning and geometric segmentation effects. The post-tensioned reinforcement was oriented in the direction of the curvature, and the RPC segments and wire conduits were curved. The arches were divided into two groups: the first covered
the post-tensioning effect, while the second covered the geometric segmentation. The results revealed that the post-tensioning in the shell arch improved the load-carrying capacity by 3.8 times. An increase in shell-arch segmentation led to an increase in the ultimate load by 5%, 10.3%, and 12.7% for 4-PT, 6-PT, and 8-PT, respectively. The monolithic and segmented post-tensioned RPC shell arches exhibited adequately integrated behavior, including high stiffness, high capacity, and reliable interfacial bonds between segments. Segmenting showed a beneficial influence despite possible local contact due to angular rotation of the thin segments.
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