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M.S. Final Oral Exam -- Aiyad Alshimaysawee

Application of Titanium Alloys Bars for Restoration of Historical Structures Considering Alternative Grout Materials

Thursday, November 30, 2017 2:00 PM - 4:00 PM

M.S. Final Oral Exam - Aiyad Alshimaysawee 

Application of Titanium Alloys Bars for Restoration of Historical Structures Considering Alternative Grout Materials 

Major Advisor: Christopher Higgins, professor of structural engineering.

Committee members: Andre Barbosa, assistant professor of structural engineering and Judy Liu, professor of structural engineering.

GCR: Tyler Radniecki, assistant professor environmental engineering. 

Abstract:

In the first quarter of the twentieth century, iron was commonly used to provide tensile resistance for preservation and restoration of historical buildings. A major factor contributing to increasing the deterioration and degradation of historic structures is corrosion of ferrous materials. One approach to avoid long-term degradation of iron and steel for restoration of historic structures is to use titanium alloy bars. Titanium alloys offer excellent corrosion resistance and predictable high yield strength. Most of the previous research has investigated pullout phenomenon under applied tension force with using lime or cement grout material, and only a few previous studies have focused on the behavior of the stone beams using titanium alloy bar under bending.

Experimental research was undertaken to investigate the application of titanium alloy bars for strengthening and repair historical structures, especially stone and masonry buildings. The aim of this research was focused on rejoining two fragments of an analog stone beam using titanium alloy bars (TiABs) bonded using the near-surface mounted (NSM) method whereby grooves are saw-cut into the beam surface. Three different materials were investigated for bonding the TiABs to the concrete substrate: cementitious, lime, and epoxy. Two different anchorage details for the TiABs were considered including straight and hooked bars. After installation of the TiABs, the specimens were tested to failure in bending. The load capacity, failure mode, bond stress of TiABs were determined to characterize the behavior and strength. The lime mortar specimens exhibited very low capacity. The hooked specimens with cementitious grout provided the largest capacity.


Kearney Hall (campus map)
111C
Michelle McAllaster
michelle.mcallaster at oregonstate.edu
Sch of Civil/Constr Engr
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