(B. Teknologi)
The Improvement of Reinforced Concrete Column Capacity with External Confinement
Keywords: column, compressive strength, external confinement, modulus of elasticity, steel rings, strain
Safitri, Endah; Mediyanto, Antonius
Fakultas Teknik UNS, Penelitian, BOPTN UNS, Hibah Bersaing, 2012
Geographical condition of Indonesia is located right above the tectonic plates (the Indo- Australian, Eurasian, and Pacific), crossed by two seismic lines (Circum Pacific and Trana Asiatic Earthquake Belts), and traversed paths Ring of Fire Java / Sunda Trench, that has become one of the countries with the risk of a large earthquake. Earthquake mitigation are steps that have to be taken to reduce loss of life and property, by design of earthquakeresistant structures that have high ductility. One of the way to improve the ductility is the restraint of reinforced concrete elements. The collapse of the structural column is very significant in terms of economic and human safety, therefore it is necessary to design the bottom of the column design to achieve high ductility.
This study aims to determine the effect of the use of ring of steel as external confinement on the compressive strength, modulus of elasticity and strain of concrete and steel ring. If a is the width of the steel ring and b is the distance between the rings, then with a variety of ratios a / b on a wide range of constant and b is a constant, it will get the optimum value of the ratio a/b. Specimens are concrete cylinders with 30 cm high and 15 cm diameter. At the constant a of 40 cm used a variation b of 90, 47, and 25 cm with ratio of a/b is 0.444; 0.857 and 1.6 respectively. In the constant b of 40 cm used a variation of 73, 45, and 28 cm with ratio of a/b is 1.833; 1.125 and 0.7 respectively.
