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A platform for research: civil engineering, architecture and urbanism
Strengthening of Reinforced Concrete Columns for Earthquake Resistance
Several methods of strengthening reinforced concrete columns to improve their seismic resistance are described. Four identical 10-inch concrete columns were constructed using No. 7 bars and 6400 psi concrete. Their design included no special transverse reinforcement for earthquake resistance. Three of the columns were strengthened externally using various techniques in order to improve their shear resistance and ductility. All four columns were tested under static reversed cycle deflections of increasing magnitude and with a constant axial load of 80,000 pounds. The unstrengthened column collapsed when the lateral deflection was about twice the deflection causing yield of the tension steel. The three strengthened columns responded nearly identically and resisted three reversed cycles at four times the yield deflection with little deterioration. Based on the test results and the ease of construction, it was concluded that U-clamp and banding techniques showed great promise in providing low cost, easy-to-construct methods for greatly improving the ductibility and earthquake resistance of existing reinforced concrete columns. The report includes photographs showing column construction, reinforcement techniques, and results of testing.
Strengthening of Reinforced Concrete Columns for Earthquake Resistance
Several methods of strengthening reinforced concrete columns to improve their seismic resistance are described. Four identical 10-inch concrete columns were constructed using No. 7 bars and 6400 psi concrete. Their design included no special transverse reinforcement for earthquake resistance. Three of the columns were strengthened externally using various techniques in order to improve their shear resistance and ductility. All four columns were tested under static reversed cycle deflections of increasing magnitude and with a constant axial load of 80,000 pounds. The unstrengthened column collapsed when the lateral deflection was about twice the deflection causing yield of the tension steel. The three strengthened columns responded nearly identically and resisted three reversed cycles at four times the yield deflection with little deterioration. Based on the test results and the ease of construction, it was concluded that U-clamp and banding techniques showed great promise in providing low cost, easy-to-construct methods for greatly improving the ductibility and earthquake resistance of existing reinforced concrete columns. The report includes photographs showing column construction, reinforcement techniques, and results of testing.
Strengthening of Reinforced Concrete Columns for Earthquake Resistance
L. F. Kahn (author)
1979
97 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Highway Engineering , Civil Engineering , Earthquake resistant structures , Reinforced concrete , Columns(Supports) , Concrete construction , Cyclic loads , Axial stress , Axial strain , Dynamic structural analysis , Seismic design , Earthquake engineering
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