Abstract
Confinement affects the increase in beam flexural capacity. The strain stress relationship of concrete cylinder compressive strength is used to analyze the beam and column capacity. The area of the curve of the concrete cylinder core with confinements is wider than the curve without confinements. Confinements can also increase ductility and shear strength of reinforced concrete structural elements. The paper aims to determine the effect of bamboo spiral stirrups distance on normal strength concrete. Concrete cylinder size 150 mm x 300 mm. Variation in crossing distance of 30 mm, 50 mm, 70 mm and without confinement. Confinements on cylinders are bamboo and steel spiral stirrups. The results show that concrete cylinders with steel confinements increase the compressive strength by 45% of the concrete cylinder without confinements. Concrete cylinders with bamboo confinements increase the compressive strength by 28 %.
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