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Chapter Concrete reinforcing steel Construction methods and management ©2010 by Do Thi Xuan Lan , M.E Chapter Concrete reinforcing steel 9.1 Classification of reinforcing steel 9.2 Placement of reinforcing steel ©2010 by Do Thi Xuan Lan , M.E Concrete reinforcing steel • Concrete is a brittle material, with low tensile strength and strain capacities; →reinforcement has to be used to balance this deficiency • Main bar reinforcement is used in tensile zones to enhance the capacity of concrete elements ©2010 by Do Thi Xuan Lan , M.E Chapter Concrete reinforcing steel CLASSIFICATION OF REINFORCING STEEL ©2010 by Do Thi Xuan Lan, M.E Classification of reinforcing steel Classification of reinforcing steel By diameters By cross section shape By grades ©2010 by Do Thi Xuan Lan , M.E By manufacturing procedure By function Classification of reinforcing steel • By diameters :  < 10 mm,  ≥10 • By cross section shape: round smooth and deformed • By grades: CI, CII, CIII • By manufacturing procedure: hot-rolled steel and cold-rolled steel • By function: working reinforcement, distribution reinforcement, erection reinforcement Deformed reinforcement ©2010 by Do Thi Xuan Lan , M.E  < 10 mm,  ≥10 ©2010 by Do Thi Xuan Lan , M.E Requirements Steel before and after cutting and bending be placed under cover and be raised from the ground Source: HCMCUT student The reinforcement tensile capacity must be tested ©2010 by Do Thi Xuan Lan , M.E Chapter Concrete reinforcing steel PLACEMENT OF REINFORCING STEEL Nguồn: sinh viên TTTN - ĐHBK ©2010 by Do Thi Xuan Lan, M.E 10 Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E Source: Nunnally 2007 19 Column reinforcement The reinforcing steel consist of two parts: • - The logitudinal bars that run the leghth of the columns • - The lateral reinforcing that encloses the logitudinal steel Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 20 Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 21 Wall reinforcement Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 22 Wall reinforcement ©2010 by Do Thi Xuan Lan , M.E Source: HCMCUT student 23 Wall reinforcementt Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 24 reinforcing steel frame for wall being lifted Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 25 Beam reinforcement Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 26 Beam reinforcement Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 27 Beam reinforcement Note the concentration of steel in the top of the beam above/under the column Source: HCMCUT student ©2010 by Do Thi Xuan Lan , M.E 28 Rebar cap Nguồn:http://www.concrete-accessory.com/products/images/rebarcap-with-steel-plate.jpg Nguồn:http://centerpointdi.com/Photos/SCPC/Rebar%20Caps.JPG 29 Rebar coupler 30 Cutting machines Nguồn:http://www.supplierlist.com/photo_images/121810/ Rebar_Cutting_Machine.jpg ©2010 by Do Thi Xuan Lan , M.E 31 Bending machines Spurce: :http://www.fascut.com/images/FR800.4.jpg Source :http://www.chinarebartool.com/smallpic/2008012807219799.jpg ©2010 by Do Thi Xuan Lan , M.E 32 ©2010 by Do Thi Xuan Lan , M.E 33