Strength of Unbonded Post-Tensioned Walls

Elgawady, Mohamed; Gheni, Ahmed; Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety

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Strength of Unbonded Post-Tensioned Walls

2014-08-01
By Elgawady, Mohamed ; Gheni, Ahmed

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English

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Details:

Creators:

Elgawady, Mohamed ; Gheni, Ahmed

Elgawady, Mohamed ; Gheni, Ahmed Less -
Corporate Creators:

Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
Corporate Contributors:

United States. Dept. of Transportation. Research and Innovative Technology Administration
Subject/TRT Terms:

[+]

Earthquake Resistant Design Flexural Strength Masonry Construction Posttensioning Research Hub: Unbonded Shear Strength Sound Barrier Spacing Tendons (Materials) Walls
Publication/ Report Number:

NUTC R349 ; Project #00042597

NUTC R349 ; Project #00042597 Less -
Resource Type:

Tech Report
Geographical Coverage:

Missouri ; United States

Missouri ; United States Less -
Corporate Publisher:

Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
Abstract:

Post-tensioned masonry wall (PT-MW) is an ideal candidate for accelerating the construction of sound barriers in highways. PT-MWs have been in use for a while in buildings; however, there has been no rigorous single-study in the U. S. about in-plane strength of PT-MWs built out of concrete masonry units. This resulted in some contradictions between International Building Code (IBC 2010) and Masonry Standard Joint Committee (MSJC 2011). MSJC (2011) defines three types of PT-MWs: ordinary plain, intermediate, and special. However, the IBC (2010) combines the different types of PT-MWs into one type similar to that of unreinforced masonry (URM) walls. This represents a significant contradiction. Specially designed PT-MW would be designed according to MSJC (2011) for a seismic lateral force equal to one-third the required seismic force according to IBC (2010). Moreover, according to MSJC (2010), both intermediate and special walls have identical prescriptive bonded mild steel reinforcement and post-tensioning bars which is similar to that of specially reinforced masonry walls while the IBC (2010) does not have similar recommendations. Finally, ordinary post-tensioned walls do not have maximum spacing between tendons in both MSJC and IBC. Hence, there is a crucial gap in the current knowledge which requires an immediate investigation. This project investigates the in-plane behavior of full-scale unbonded post-tensioned walls. All walls have the same total post-tensioning force and identical dimensions of 104 in. long, 96 in. high, and 8 in. wide. Spacing between tendons ranging from 24 in. to 96 in. were investigated. The walls were subjected to in-plane shear loads of increasing amplitude. Both flexural strength and shear strength were evaluated and compared to the strengths given by MSJC (2011).
Format:

PDF
Funding:

DTRT06-G-0014
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:82d170e49b6edb5acec17ed19ba12a5dca512e18ace6612915ffb0dd90d29fe0
Download URL:

https://rosap.ntl.bts.gov/view/dot/27977/dot_27977_DS1.pdf
File Type:

[PDF-5.80 MB]