Behavior of Slender, Posttensioned Masonry Walls under Transverse Loading
Publication: Journal of Structural Engineering
Volume 133, Issue 11
Abstract
A conceptual model of the response of slender, posttensioned masonry walls to uniformly distributed, transverse loading is introduced and verified through an experimental program. To validate the model, 12 simply supported 3.54 m (11.6 ft) tall walls with cross sections were tested under monotonically increasing transverse (i.e., out-of-plane lateral) loads. Six walls were built using cored clay brick, and the remaining six using hollow concrete block. The walls were posttensioned using threaded steel bars with six walls featuring “unrestrained” tendons (i.e., neither grout nor mechanical devices were used to restrain the bars), while the other six had “restrained” bars (i.e., mechanical devices were used to restrain the bars relative to the masonry), and three magnitudes of effective prestress were investigated. Initial response to transverse loads was linear, but cracking was observed over a broad range of loading. The response of the wall specimens is traced through crack propagation, hinge formation, and development of a plastic section.
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Acknowledgments
This research was conducted with financial support from the National Concrete Masonry Association (NCMA) Foundation, the Brick Industry Association (BIA), and the International Masonry Institute (IMI), the U.S. National Science Foundation (NSF) through Grant No. CMS-9904110, and the University of Minnesota. Materials and labor were donated by the Anchor Block Company, Minnesota Brick & Tile Company, Sika Corporation, and Bricklayers and Allied Craft Workers Local Union 1, Minneapolis, Minnesota. Twin City Testing donated use of their material testing equipment.
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© 2007 ASCE.
History
Received: Aug 25, 2005
Accepted: May 15, 2006
Published online: Nov 1, 2007
Published in print: Nov 2007
Notes
Note. Associate Editor: Yahya C. Kurama
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