Past Research

BROOKLYN BRIDGE (NY): STRAND REPLACEMENT (1981-82)

Development procedures for strand replacement within the anchorages of the Brooklyn Bridge. The feasibility of installation and the performance of zinc and resin poured sockets was tested. In order to simulate the actual field conditions, a mock-up of the anchorage cavities was erected in the Laboratory. 

MANHATTAN BRIDGE (NY): INVESTIGATION OF THE SUSPENDED SPANS (1982)

Strain gage measurements of stresses in selected elements of the stiffening trusses and the floor beam system; preparation of stress spectra for fatigue analysis. 

TRIBOROUGH BRIDGE (NY): DEVELOPMENT OF SOCKETING PROCEDURE FOR STRAND (1982)

Development of a procedure of zinc-poured sockets for strand replacement in the anchorages. 

BRONX-WHITESTONE BRIDGE (NY): ANCHORAGE EYEBAR TESTS (1989)

Tests of full-scale eyebar copies; determination of the load-extensions behavior and the ultimate tensile strength. 

INVESTIGATION OF PRE-STRESSED CONCRETE RAILROAD TIES (1989-91)

Investigation of the strength and durability of pre-stressed concrete ties; petrographic examination of concrete for the presence of alkali-silica reaction and delayed ettringite formation. 

TRIBOROUGH BRIDGE (NY): ANCHORAGE CONCRETE INVESTIGATION (1991)

Strength tests and petrographic examination of cores from the anchorages. 

GEORGE WASHINGTON BRIDGE (NY): MAIN CABLE WIRE INVESTIGATION AND SOCKETING PROCEDURE FOR STRAND REPLACEMENT (1992-93)

Investigation of wire samples from the main cables and from the strands in the anchorages; tension and fatigue tests; fractographic and metallurgical examination. Development of socketing procedure for implementation in possible future strand replacements in the anchorages. 

NASA NOISE AND VIBRATIONAL TRANSMISSION CONTROL

Vibration and noise transmission control by add-on treatments to the sidewalls of an aircraft was investigated. The add-on treatments included constrained layer damping tapes, honeycomb panels, porous acoustic materials, noise barriers and isolated trim panels. Significant reduction in vibrations and noise transmission has been achieved by these treatments. 

VIBRATION CONTROL BY TUNED MASS DAMPERS

A dynamic shaker was designed and built for vibration testing of floors and other flexible structures. The shaker was used to tune dampers that were installed at the Terrace on the Park building in NYC. 

WILLIAMSBURG BRIDGE (NY): MAIN CABLE WIRE INVESTIGATION (1987-88)

A comprehensive program of wire investigation for the determination of the residual strength of the main cables. Tests of the yield stress, static tensile strength, ductility and fatigue of wire samples. Fractography of in-situ and laboratory wire fractures. Metallurgical evaluation of the wire steel corrosion studies. 

WILLIAMSBURG BRIDGE (NY): DEVELOPMENT OF RESIN SOCKETING PROCEDURE FOR STRAND REPLACEMENT (1990)

A test program to determine the feasibility of resin-poured socketing for strand replacement; investigation of the polyester resin materials, socketing procedures, and the tensile, fatigue, and creep strength of strands with resin-poured sockets.

GOLDEN GATE BRIDGE (CA): MAIN CABLE WIRE INVESTIGATION (1991)

Tests of mechanical properties of wire samples; fractography and metallurgical examination.

BEAR MOUNTAIN BRIDGE (NY), BRONX WHITESTONE BRIDGE (NY): MAIN CABLE WIRE INVESTIGATION (1991-92)

A comprehensive program of investigation of zinc and steel corrosion, strength ductility of the wires, fatigue strength; fractographic and metallurgical examination of wire samples. 

CONCRETE BLOCK MASONRY TEST PROGRAM

Six 3 course and twenty-four 5-course concrete block masonry piers have been loaded monotonically and cyclically in compression. The results obtained are the load-deflection curves, dissipated energies, variations in tangent stiffness, failure loads and modes of failure. These were used to develop a mathematical model to simulate the response of concrete block masonry walls to static and dynamic loads. 

SHOCK VIBRATION RESPONSE OF ELECTRONIC VOTING MACHINE

The Electronic Voting Machines were tested to shock vibrations. The shocks were imposed to the machines using a vibration platform. Shock vibrations corresponding to 2,500 miles travel on NYC streets and roads were simulated. 

GLASS CONCRETE RESEARCH AND DEVELOPMENT

Development of technology to produce concrete with waste glass as aggregate; extensive studies of the alkali-silica reaction and development of countermeasures to avoid damage.

NEW YORK HARBOR DREDGE MATERIAL 

A comprehensive research program to decontaminate highly polluted dredge material from the Port of New York and New Jersey and to search for beneficial uses of that material in concrete.


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