International Seminar on Advances in Steel and Composite Structures

Transcription

1 International Seminar on Advances in Steel and Composite Structures Date: Tuesday, 12 June, 2018 Time: 1:30 PM 6:00 PM Venue: LT6, Faculty of Engineering, (Block E4, Level 4, 4 Engineering Drive 3), National University of Singapore, S (117583) (Free Admission) Organizer: DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING, NUS BUILDING AND CONSTRUCTION AUTHORITY (BCA) SEMBCORP-NUS CORPORATE LABORATORY, NUS CENTRE FOR ADVANCED MATERIALS AND STRUCTURES Sponsors: CONTINENTAL STEEL PTE LTD YONGNAM HOLDINGS LTD 1

2 Time Content Speaker 13:30 14:00 Registration 14:00 14:10 Opening Speech 14:10 14:40 Innovation in Prefabricated Prefinished Volumetric Construction Er Chew Keat Chuan, BCA Prof. Richard Liew, NUS 14:40 15:10 15:10 15:40 Use of High Strength Steel to improve Construction Productivity Experimental study on mechanical properties of ultrahigh strength concrete at elevated temperatures Prof Chiew Sing Ping, SiT Prof Chan Siu Lai, The Hong Kong Polytechnic University 15:40 16:10 Tea Break 16:10 16:40 16:40 17:10 Beyond Conventional Concrete: High Strength, Lightweight, and Durable A numerical study of axially loaded ultra-high strength concrete-filled steel tubular columns with confinement effect Prof. Zhang Min-Hong, NUS Dr. Wang Tongyuan, NUS 17:10 17:40 17:40 18:00 Q & A Case Studies of Innovative Prefabricated Composite Structure in Singapore and Korea Mr. Lee Seunghwan & Mr. Jeong Jaewook, SEN Engineering Group Prof. Richard Liew, NUS ENQUIRIES and REGISTRATION: For registration, please contact: CEE Dept Office, Ms Norela Buang Tel: nor@nus.edu.sg For seminar details, please contact: Coordinator, Dr. Chua Yie Sue Tel: ; ceecysue@nus.edu.sg For professional enquiry, please contact: Chair, Professor J Y Richard Liew Tel: ; ceeljy@nus.edu.sg 2

3 Location Map 2

4 Opening Speech SPEAKER: ER. CHEW KEAT CHUAN, BUILDING AND AUTHORITY (BCA) Er Chew Keat Chuan is the Commissioner of Building Control as well as the Group Director, Building Engineering Group, Building and Construction Authority. He is a registered PE (Civil) and Accredited Checker with more than 30 years of experience in engineering practices. His portfolio in BCA includes administrating the Building Control Act, formulating and reviewing policies on building safety, and overseeing the safety of buildings, bridges as well as subways under construction in Singapore. 1

5 Innovation in Prefabricated Prefinished Volumetric Construction J Y Richard Liew Professor & Fellow of Academy of Engineering (Singapore) Department of Civil & Environmental Engineering National University of Singapore ceeljy@nus.edu.sg The Building industry in Singapore has been adopting a new PPVC technology for building construction. PPVC so called Prefabricated prefinished volumetric construction has gained popularity due to its numerous advantages such as faster construction speed, better quality finishes, reduction in work force and construction waste, etc. PPVC technology promotes off-site manufacturing of modular units and on-site assembly, improving the construction efficiency and productivity. However, for high-rise buildings, the joints flexibility and construction sequence have significant impact on the overall stability of the building. This paper highlights the existing challenges of modular construction of high-rise buildings and provide several options to address these challenges. Firstly, the weight of a module is constrained by the transportation and lifting crane capacities. For this reason, steel and lightweight concrete composite system is introduced to reduce the weight of the module without compromising the strength and stiffness. Secondly, to speed up the site assembly of modular units, special joints are developed to resist the forces due to gravity and horizontal loads. Fast and easy joining techniques with acceptable tolerance control are essential to ensure the structural integrity and stability of the building. Finally, the innovation for productivity can be maximized by implementing automation technologies in the manufacturing and construction of the modular units. Richard Liew is a Professor in the Department of Civil & Environmental Engineering at the National University of Singapore. He is a Chartered Engineer in UK, a Professional Engineer in Singapore, and a Chartered Professional Engineer of the Association of Southeast Asian Nations. He is a Fellow of the Academy of Engineering Singapore, an Honorary Fellow and the Past President of Singapore Structural Steel Society. He has been involved in research and practice in steel and composite structures with lightweight and high strength materials for applications in offshore and marine, defense, civil and building structures. He serves on the editorial boards of 8 international journals. He has been consulted for the design and construction of several prominent tall buildings and large span structures in Singapore. He is a key person responsible for the development of Singapore s codes of practices of steel structures and steel-concrete composite structures. He also serves on the expert panels for Building Construction Authority and Housing Development Board in Singapore. 2

6 Use of High Strength Steel to Improve Construction Productivity Chiew Sing Ping Professor of Civil Engineering Programme Director, Civil Engineering SINGAPORE INSTITUTE OF TECHNOLOGY, SINGAPORE There is a push towards use of high strength steel in Structural Eurocodes, and they should rightfully be used to improve construction productivity, efficiency and safety. For examples, Grade 600 reinforcing steel and Grades S460 up to S690 structural steel are now permitted in EC2, EC3 and EC4 respectively. However, there are still some outstanding design issues to be taken care of before these high strength steel can be fully mobilized. This presentation will touch on some of these issues on use of Grade 600 reinforcing steel and Grades S460 S690 structural steel and will present the solutions to overcome these issues. Finally, some examples on use of these high strength steel in local projects will be highlighted. Chiew Sing Ping is Professor of Civil Engineering and Director of Civil Engineering Programme at Singapore Institute of Technology, Singapore s fifth autonomous university with a strong focus on Applied Learning. He was previously Head of the Division of Structural Engineering and Mechanics at Nanyang Technological University, Singapore from 2008 to He is a Member of the Panel of Expert Advisors of the Land Transport Authority, Board Member of the Professional Engineers Board, Member of the Technical Advisory Panel of the Inland Revenue Authority and Member of the Inquiry Panel of the Law Society of Singapore. 3

7 Direct Analysis of Composite Structures S L Chan Chair Professor Department of Civil & Environmental Engineering Hong Kong Polytechnic University ceslchan@polyu.edu.hk Hybrid frames composed of steel, concrete and composite members are widely used to-date due to their structural efficiency and economy as alternatives to traditional bare steel system, especially in high-rise buildings. However, the present design of this structural form is both inconvenient and inconsistent as it needs several separated design codes for bare steel (BS), reinforced concrete (RC) and steel-concrete composite (SCC) elements. This paper proposes a second-order design method which requires only section capacity check without the need of using prescriptive formulae in different codes for various structural forms. The memberbased design using linear analysis and the effective length assumption is replaced by the iterative second-order analysis. Using the Pointwise-Equilibrium-Polynomial (PEP) element, which allows for member P-δ effects and initial imperfections in conjunction with a robust nonlinear incremental-iterative procedure, the nonlinear response of individual members and the structural system is captured directly and used for structure resistance checks. The sectional failure surface method is introduced for member strength checking. In the generation of failure surfaces of the arbitrarily shaped cross sections, the stress distribution along the concrete component is considered by an equivalent stress block or a number of segments and the entire structural steel section will be meshed into fibres for determination of section capacity. Verifications of the proposed integrated analysis and design method based on section capacity check are conducted using several examples with accuracy of the method demonstrated. Professor S.L. Chan is now the Chair Professor in Computational Structural Engineering at the Department of Civil and Environmental Engineering of The Hong Kong Polytechnic University and chief editor of the journals Advanced Steel Construction, Steel and Composite Structures ( ) and Applied Mechanics and Engineering as well as board member of eight other journals. In the past three decades, Professor Chan carried out research for a new design method called the second-order direct analysis allowing for imperfections in practical structures bypassing the unreliable effective length assumption and the prescriptive use of charts and tables in design codes. He has been the chief consultant for Hong Kong steel code 2005 and 2011 versions. With his co-workers, he programmed software Nida ( for research, educational and practical applications of the non-linear design method and developed software RCD-2014 for biaxial bending analysis of composite columns and core walls. 4

8 High Strength Concrete Encased Steel Composite Columns Design and Applications Wang Tongyun Senior Research Fellow Department of Civil & Environmental Engineering National University of Singapore In today s top down construction method, there is an increasing trend of encasing the steel kingposts with concrete as permanent composite columns for the basement after excavation. This practice not only saves construction materials but also improves construction productivity. Different from composite column sections in super structures, the design of kingposts converted composite columns needs to consider constrained column footprint and large eccentricity. This presentation discusses experimental study and numerical analyses of MND/BCA funded research project on the use of high strength concrete for concrete encased steel composite columns. From this on-going research project, the team also discusses the design consideration for encasing steel kingposts to form composite columns to resist high compression force and the eccentricity moments. Dr. Wang Tongyun graduated with PhD and MEng. Degrees from National University of Singapore with research topics on sandwich composite structures and optimization algorithm. He obtained his BEng. from Chongqing University in China. He has been working in Prof. Liew s steel and composite group over 14 years on series of research projects of composite structures under extreme loadings including impact, fire and blast for building and offshore applications. Dr. Wang has gained industrial experience as design engineer to apply his research experience on series of design projects on steel/composite structures and advanced numerical simulations assisted design of composite structures, complex connections, wind analyses and blast resistant design. With his experience of A*Star/BCA funded research project on high strength CFT composite columns, he has joined NUS as a Senior Research Fellow to work on MND/BCA funded research project on high strength CES composite column project since His research interests includes steel-concrete composite structures and fast track numerical simulations including FEA and CFD. 5

9 Case Studies of Innovative Prefabricated Composite Structure in Singapore and Korea Seunghwan Lee CEO of SEN CORETECH INC., VP of SEN Structural Engineers Co., Ltd. SEN Engineering Group Jaewook Jeong Managing Director, Singapore of SEN SG Pte Ltd SEN Engineering Group SEN Engineering Group, a Korea-based structural solution provider, introduces new productivity enhancing system such as Form-Prefabricated Steel Reinforced Concrete (F- PSRC) column and Thin Steel-plate Composite (TSC) beam. This system can dramatically augment on-site productivity by eliminating the on-site works including rebar installation, formwork, scaffolding and propping. The F-PSRC column and TSC beam system has been successfully applied in more than 50 projects and 400 projects respectively, especially in those involving super-fast-track IT industrial buildings and offices. And now this system is being applied in Singapore through JTC s large-scale inland container depot building project. Hence, it is imperative that those in the industry learn about how the F-PSRC column and TSC beam system practices and design are able to shorten the construction periods of projects through game-changing productivity enhancement. Seunghwan Lee is in charge of CEO of SEN Engineering Group in Korea. He had studied at Seoul National University in Korea as bachelor of Engineering and Cornell University in US as MBA. He had experienced in construction and financial industries for 10-years before joining SEN Engineering Group. He established SEN CORETECH INC., as a specialized fabrication company using SEN s system in 2010, and attracted investment from Pavilion Capital, an affiliate investment fund of Temasek in Jaewook Jeong is in charge of Managing Director of SEN SG Pte Ltd, a Singapore subsidiary of SEN Engineering Group. He received his PhD from Architectural Engineering at Yonsei University in Korea. As a professional engineer and researcher, he had worked at Kolon Global Corporation in Korea for 15-years, and also had published a dozen of SCI (E) papers about productivity and sustainability on construction industry. He had taught a construction engineering at Ewah Womans University and Hanbat University in Korea, and he is a reviewer of several international journal such as Journal of Management in Engineering, Building and Environment, applied energy and etc. 6