The construction sector plays a major role in the economy of each industrialized country. This industry is increasingly interested in participating in sustainable development, which includes ensuring that materials come from sustainable practices and have a low environmental footprint. Wood, with its ability to store carbon, has every advantage to be used in the construction and development of buildings. This plenary session is intended to explain the benefits and challenges of opting for wood within a forest bio-economy and sustainable development perspective for future generations.
Moderator: Robert Beauregard, Université Laval, Canada
Wood construction and the low-carbon transition
Speaker: David Bruchon, ICADE, France
Effect on carbon footprinting of timber structures in China
Speaker: Minjuan He, Tongji Architectrual Design (Group) Co., Ltd., China
China has a long history of mid- and high-rise timber structures. An example is the well-known Yingxian wooden pagoda, which was built in 1056 A.D. and, at 67 metres, remains the tallest wooden pagoda in the world. With the development of timber structures worldwide and the promotion of green buildings by the Chinese government, more and more builders and researchers have shown their interest in mid- and high-rise timber structures in China.
This presentation will provide a systematic and comprehensive investigation into two timber structural systems: timber-steel hybrid structures—which consist of steel moment resisting frames, infill wood shear walls, and timber-steel hybrid diaphragms—and cross-laminated timber (CLT) structures. For the timber-steel hybrid structure, the quasi-static test of the hybrid diaphragms and the shear walls, the shaking table test of a timber-steel hybrid structure, and the proposed seismic design method are presented. For the CLT structure, tests on some innovative connections, lateral performance of conventional CLT shear walls and the post-tensioned CLT shear walls, and development of a displacement-based seismic design procedure for CLT structures are presented. The information generated from these studies will provide the technical support for future code implementation for mid- and high-rise timber structures in China.
Växjö is building in wood
Speaker: Johan Thorsell, Växjö Municipality, Sweden
The City of Växjö is located in the middle of the forest in the south part of Sweden. Wood is a local and renewable material. It is natural for us to build our houses in wood. Nowadays the traditional wood house manufacturers are developing very fast. The production of houses today is made indoors in factories. The industry is trying to copy the way of the car manufacturers. The building processes on the building-sites are very fast and more and more just about assembling. Furthermore, the material is light to transport and it is easy to process.
The main reason for the City of Växjö choosing wood is the climate and the environment. We know that somewhat 30% of the CO2 emissions comes from the building industry in Sweden today. Växjö with its strong focus on emission of course must tackle and handle these CO2-emissions as well if we want to improve further. Thus, building in wood is part of our environmental program, but we also have a separate wood building strategy to improve and influence the municipal organisation and the building industry. Targets in the program and strategy are measured every year.
David Bruchon, wood engineer, graduated from the École National Supérieure des Technologies et Industries du Bois (France) in 2000, specializes in the design of low carbon footprint projects and is a référent RSE (corporate social responsibility expert). He was a high-level engineer (wood) in a consultancy office with BC2E, and then at Sylva Conseil, from 2000 to 20011. From 2011 to 2017, he was responsible for the wood engineering hub of the Terrell Group TCE consultancy and adjunct manager of its Toulouse office. He has been the technical director responsible for dry construction and corporate social responsibility (CSR) at Icade Promotion since November 2017. In this role, he has provided technical support for many low carbon footprint projects using wood and has piloted Icade Promotion’s CSR strategy, which is part of its 2019–2022 Plan. Mr. Bruchon also has a great deal of experience as a designer and has created many major projects throughout France.
Professor He obtained her BSc in Civil Engineering, and her MSc and PhD in Structural Engineering from the Department of Building Engineering, Tongji University, China. She has been working at Tongji University as a full professor of structural engineering since 2001. As a visiting professor, she worked at Trento University, Italy in 2001 and at the University of British Columbia, Canada in 2003.
Professor He is active in academic activities related to timber engineering. Her research interests include the load-bearing capacity of timber connections, lateral resistance and seismic performance of timber structures, and the structural performance of wood-based hybrid constructions. She has published more than 200 academic papers. She participates in more than ten Chinese national codes such as the Code for Design of Timber Structures (GB 50005), the Technical Code of Glued Laminated Timber Structures (GB/T 50708). She holds several positions in academic societies such as vice director of the Committee on Timber Engineering of the Architectural Society of China. For her outstanding work on research and teaching, she has received more than ten awards for scientific and educational achievements from the Government of China.
Johan Thorsell, Business Developer, wood and urban development, has a Master’s degree in business law (law and economics). He spent 10 years at the Swedish Trade Council, promoting Swedish exports, mainly as area manager for Africa and the Middle East. He was the international coordinator for the City of Växjö – Strategic Planning Office (technical visits, international projects, the City’s international policy) for three years. Växjö is a city in southern Sweden with a population of about 66,000. Mr. Thorsell was also its business support manager (in the Business Support Office, economic/business development) for six years, and has been the city business developer (wood and urban development), for the Executive Office for two years.