4C2B: Century-scale Carbon-sequestration in Cross-laminated Timber Composite Bolted-steel Buildings
Project Innovation + Advantages:
Northeastern University will dramatically accelerate the replacement of carbon-intensive concrete structural components by developing a new structural system comprised of deconstructable and reusable steel frames with cross-laminated timber (CLT) floor diaphragms. Diaphragms are structural elements that transmit lateral loads to the vertical resisting elements. CLT diaphragms can store up to 50% of their weight in biogenic carbon. Building design for deconstruction (DfD) of steel+CLT allows for direct reuse of structural members, reduces new steel emissions, and enables storage of biogenic carbon in timber for 100+ years, which the typical 40–50-year lifespan of building materials is unable to accomplish. The team will also address the technical risks and uncertainties around DfD steel-to-CLT and CLT-to-CLT connectors as well as apply innovative advanced manufacturing techniques for CLT to use local timber, expanding U.S. manufacturing potential while reducing carbon emissions from the transportation of materials.
HESTIA projects will facilitate the use of carbon storing materials in building construction to achieve net carbon negativity by optimizing material chemistries and matrices, manufacturing, and whole-building designs in a cost-effective manner.