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Slab-column connections with misplaced reinforcementLai, Wai Kuen (Wai Kuen Frank) January 1983 (has links)
No description available.
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Behavior of concrete under biaxial cyclic compressionZisman, Joseph Gary January 1982 (has links)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 188-189. / by Joseph Gary Zisman. / M.S.
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Dynamic response and impact effects in precast, prestressed concrete bridge tiesIgwemezie, Jude O. January 1987 (has links)
No description available.
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Precast prestressed ties on bridge girders : analytical and experimental load distribution studiesIgwemezie, Jude O. January 1983 (has links)
No description available.
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Behaviour of a two-cell prestressed concrete box girder bridge : analytical studyKhaled, Amar January 1988 (has links)
No description available.
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Precast prestressed ties on bridge girders : experimental response and design reviewIgwe, Obi R. January 1983 (has links)
No description available.
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Behaviour of a two-cell prestressed concrete box girder bridge : experimental studyJoucdar, Karim January 1988 (has links)
No description available.
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Slab-column connections with misplaced reinforcementLai, Wai Kuen (Wai Kuen Frank) January 1983 (has links)
No description available.
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Nondestructive evaluation of reinforced concrete via infrared thermography: a feasibility studyLee, Jeffrey Allen 08 April 2009 (has links)
An experimental investigation was conducted to develop a laboratory technique for the nondestructive evaluation of reinforced concrete. The methodologies were developed with the intent of eventual field implementation to determine the feasibility of utilizing infrared thermography to inspect substructural elements of concrete bridges.
Several specimen configurations were fabricated for thermographic inspection. A number of tests were performed on a variety of concrete specimens to determine the implementation parameters of the technique. The necessity of utilizing artificial heating methods for thermal input prior to inspection was evaluated.
The present study suggests that infrared thermography cannot be applied to substructural elements of bridges in a noncontact fashion. Internal thermal gradients produced by diurnal temperature fluctuation generally are not sufficient to produce the variations in surface temperature patterns necessary for thermographically detecting nonvisual subsurface defects. Rather, both the envelopment and artificial heating of the substructural element is required prior to thermographic inspection. / Master of Science
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The effect of welding heat on the properties of concreteWhitescarver, John Penn 26 April 2010 (has links)
This thesis is an investigation of the effect of welding heat on the properties of hardened concrete. In precast concrete structures, where the bearing plates are embedded in the concrete, the welding heat on these plates, generated by the electric arc, penetrates into the concrete. It has been known for many years that high temperatures will lower the modulus of elasticity and the ultimate strength. This thesis is concerned with the “critical” temperatures at which losses begin and the arc energy required to develop this temperature at a reasonable depth into the concrete.
In the investigation, the “critical” temperature, using limestone aggregate concrete that might be typical for precast construction, was found to be between 900°F and 1,000°F.
The investigation, to determine the arc energy required to develop this temperature, was halted when under severe heating, where the arc burned through both plates, the maximum temperature at a point one half inch from the bearing plate was 710°F. Although cracking was severe in the immediate vicinity of the plate, the moduli of elasticity were lowered only slightly and the welding heat was not high enough to affect the ultimate strength. / Master of Science
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