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KOLOS
KOLOS is a concrete interlocking armour unit intended to protect coastal structures like seawalls and breakwaters from the ocean waves. These blocks were developed in India and were first adopted for the breakwaters of the Krishnapatnam Port〔http://www.navayugagroup.com/pdf/nec_e-brochure.pdf,Page no.12〕 along the East coast of India.
==Concept of KOLOS==
KOLOS has been conceptualized by incorporating structural improvements to existing armour units, Dolos. The common failure modes for Dolos were found to be either at the shank due to torsion and at the fluke by bending induced shear.〔https://journals.tdl.org/ICCE/article/viewFile/3546/3228〕 The higher structural stresses are caused largely due to the longer lever arm. The elongated shank length of in the Dolos was shrunken by 21.4% in KOLOS.The material thus saved compensates for thickening the legs of KOLOS.
KOLOS is characterized by a central shorter concrete member and two outer elongate concrete members connected on opposites sides of the central member. The outer members have parallel longitudinal axes extending normal to the longitudinal axis of the central member. These members have an octagonal cross-section and are further configured such that their cross-sectional area decreases from its intermediate portion towards opposite ends thereof.〔Chandramohan, P.V, Sundar, V., Sannasiraj, S.A. and Arunjith, A. (2012). “Development of ‘KOLOS’ armor block and its hydrodynamic performance”, Proc.8th Intl. Conf. on Coastal and Port Engineering in Developing Countries (PIANC-COPEDEC VIII), Chennai, India, February, pp 1344-1354〕
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