Vibration testing of an epoxy-repaired reinforced concrete test structure

Technical Report · Tue Mar 01 04:00:00 EST 1983

OSTI ID:6346726

Owen, G N; Egbuonye, I O; Kustu, O; Scholl, R E

A full-scale, 4-story reinforced concrete structure, deliverately damaged by forced vibration in 1974, was repaired by the epoxy-injection method and retested in 1979 using the same reciprocating-mass vibration generator. The program consisted of a series of tests, beginning with low-amplitude vibrations, followed by forced vibrations, increased into the range of inelastic response of the structure. The test program was similar to the 1974 testing of the original, undamaged structure. Structural damage from the first destructive test was extensive, consisting of x-cracking and spalling at the bean-column connections. The 1979 damage to the epoxy-repaired structure was similar to that sustained by the original structure in 1974, but the cracking was more widely distributed, and, in general, damage was less severe following the 1979 test. The results of this study show that, for low-amplitude motions, the epoxy-repaired structure was slightly less stiff than the original undamaged structure. However, a plot of the destructive-test data shows that, as the amplitude of the structure's response increased, the difference in stiffness between the epoxy-repaired structure and the original structure decreased. At large deflections associated with severe damage, the epoxy-repaired structure was actually stiffer than the original structure. The cracking at beam-column connections appeared to be much less severe in the 1979 test than in the 1974 test. The behavior of the test structure, in both its original and epoxy-repaired states, was compared with that of theoretical models. The stiffness of models using moments of inertia for cracked sections, as recommended in the ACI 318-77 Commentary, are representative of the stiffness of the test structure as it begins to yield and to sustain visible damage.

• Research Organization: URS/John A. Blume and Associates, Engineers, San Francisco, CA (USA)
• DOE Contract Number: AC08-81NV10145
• OSTI ID: 6346726
• Report Number(s): JAB-10145-3; ON: DE83011379
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
BUILDING MATERIALS
BUILDINGS
CONCRETES
CRACKS
DAMAGE
DESTRUCTIVE TESTING
EARTHQUAKES
EPOXIDES
MATERIALS
MATERIALS TESTING
MATHEMATICAL MODELS
MECHANICAL STRUCTURES
MECHANICAL VIBRATIONS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
REINFORCED CONCRETE
REINFORCED MATERIALS
REPAIR
SEISMIC EFFECTS
SEISMIC EVENTS
TEST FACILITIES
TESTING