High Strength Steel Reinforcement A new beginning in Smart Construction Made from minimum 50% Recycled Content

Transcription

1 N. Saravanan High Strength Steel Reinforcement A new beginning in Smart Construction Made from minimum 50% Recycled Content

2 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

3 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

4 NatSteel is a fully integrated steel mill providing steel reinforcement solutions in Asia Cut & Bend and Coupler Products Mesh Solutions Prefabricated Cage Solutions Carpet Reinforcement Solutions

5 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

6 High Strength Steel Reinforcement (HSR): Grade 600 High Strength Steel Grade 600B Yield Strength: 600MPa Tensile / Yield Ratio : 1.08 A gt : 5% Design Stress Strain diagram for Grade 600 steel 6

7 High Strength Steel Reinforcement (HSR): Grade 600 Use of Grade 600 steel is permitted under Singapore National Annex to Eurocode 2 (Clause: (3)) Design governed by EC2 (SS EN ) 7

8 High Strength Steel Reinforcement (HSR): Grade 600 Normal strength concrete can be used with HSR Pure Compression members: It s beneficial to use HSR with High Strength Concrete 8

9 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

10 Grade 600 Steel A Potential Productivity Driver Steel reinforcement forms the basis of any reinforced concrete building and Singapore uses about 1.7Million tonnes / year Grade 600 steel can be used in all sectors of construction such as, Residential, Commercial, Industrial, Infrastructure & Institutional projects Use of Grade 600 steel is expected to bring higher construction productivity in the many aspects of construction, as detailed in the following slides 10

11 Benefits of using Grade 600 Steel Item Description Steel Savings Potential to reduce steel reinforcement up to 20% to 30% compared to current grade 460 steel Concrete Savings Steel fabrication Reduction in structural element size is possible when used with appropriate grade of concrete and results in overall dead load being reduced About 20% less workers are needed Logistics Less trucks carrying steel reinforcement on the roads about 20% less Site Crane Manpower - Steel fixing / Installation Handles about 20% less steel and frees up crane time for other construction activities thereby speeding up constr. About 20% less onsite workers are required to install / fix steel reinforcement onsite Lighter foundations Due to reduction in member size resulting in lighter super structure, foundation loads can be reduced *Values in the tables are estimated values 11

12 Benefits of using Grade 600 Steel Item Less formwork Description Possible to reduce formwork needed for Columns and Beams due to member size reduction More usable space More floor space is usable due to column size reduction Improved Safety Storage space Time reduction Cost reduction Others Site safety will be improved due to less material handling, fixing etc Space required for site storage of steel reinforcement can be reduced by about 20% Overall time savings can be accomplished by factoring in the above items Overall cost reduction can be achieved from reduced Material, Manpower, Construction Time etc Reduced Construction noise, Fuel consumption etc *Values in the tables are estimated values 12

13 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

14 Case Study-1: Typical HDB Unit Typical 4Room Unit 14

15 Case Study-1: Typical HDB Unit EC2, Steel - Gr.600, Concrete Gr Storey high Typical 4Room Unit Slab : 125mm thk Beam : 250 x 500mm Column: 300 x 1500mm Possible Steel Savings*: Element % Savings Vs Gr.500 % Savings Vs Gr.460 Slab 19.9% 30.4% Beam 10% (W/Nominal links) 15% (W/Nominal links) Column # 10% (W/Nominal links) 15% (W/Nominal links) Overall Average Savings / Unit: 13.96% 21.16% * Approximate Design and Estimation *Distribution of Steel: Slab (40%), Beam (30%), Column (30%) #Potential for savings 15

16 Case Study-2: NTU Learning Hub 16

17 Case Study-2: NTU Learning Hub EC2, Steel - Gr.600, Concrete Gr.40 (Cube) 8 Storey high Flat Slab : 300mm thk Column: 400 to 600mm dia. Possible Steel Savings*: Element % Steel Savings Column 12% Flat Slab 26% Overall Average Savings = 20.4% *Distribution of Steel: Slab (60%), Column (40%) 17

18 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

19 HSR Adoption in Other Countries The following countries have adopted Grade 600 or higher strength steel, Austria Japan South Korea USA 19

20 HSR Adoption in Other Countries - Austria Austrian Reinforcing Steel Standard B 4707:2010 for use with Eurocode 2 20

21 HSR Adoption in Other Countries - Japan Japan is using Grade 600 for over a decade for Residential, Commercial projects etc 21

22 HSR Adoption in Other Countries South Korea In South Korea, Grade 600 rebar is being used for over 4 years in the construction of high-rise buildings and is mainly driven by Korea Land and Housing Corporation (LH) due to the High Strength, Productivity and Green benefits. Project References from South Korea: Public Housing Project Kyungnam/Kimchun Condominium (Around 1,500 Units) Osan Sekyo Condominium (Around 500 Units) JoenJu Condominium (Around 700 Units) Wonju Hyucksin Condominium (Atound 1,200 Units) Private Project R&D Center (CHA Hospital) The Federation of Korean Industries Center DAISO Distribution center 22

23 HSR Adoption in Other Countries - USA 690 and higher strength reinforcement steel are being used in USA for over 8 years Specification ASTM A 1035/A 1035M - 11 Description Deformed and Plain, Low-carbon, Chromium, Steel Bars for Concrete reinforcement Yield Strength 690 MPa and 830 MPa The Escala Condo, 31Sty + 8B, Seattle 23

24 Synopsis About NatSteel High Strength Steel Reinforcement (HSR) Benefits Trial Designs HSR Adoption in Other Countries HSR Adoption in Singapore

25 HSR Adoption in Singapore Current Singapore Product Standard SS560 : 2010 does not incorporate Grade 600 steel NatSteel initiated a NWI with SPRING to formulate the Grade 600 Product standard in Apr 2013 SPRING formed a Task Force (TF) to gather information on Grade 600 and the TF submitted it s report to TC (Technical Committee) in June 2014 A WG (Work Group) was formed under TC to draft the Grade 600 Product Standard in Nov 2014 Currently the WG is drafting the SS560 : 2015 incorporating Grade 600 The SS560 : 2015 is expected to be published this year! 25

26 Thank you