Innovative Interlocking Connection System For Mediumrise Timber Modular Structures

Cross Laminated Timber Modular Construction (CLTMC) represents a cutting-edge
advancement in the construction industry, merging the ecological benefits of timber with the
streamlined processes of modular construction. This innovative approach offers a sustainable
alternative to conventional construction methods, promising significant reductions in
environmental impact and improvements in building efficiency. Despite these advantages,
recent research has identified critical inefficiencies within existing CLTMC connection
systems, particularly concerning their mechanical performance, installation complexity, and
overall sustainability. These inefficiencies pose significant challenges to the broader adoption
and development of CLTMC technology.
This thesis addresses these challenges by introducing an innovative sliding and stacking
installation method for CLT modules. Central to this method is a novel, damage-controlled,
continuous interlocking connection system designed to enhance the efficiency of module
assembly while reducing onsite labour demands. The proposed connection system was
rigorously evaluated through a combination of experimental and numerical analyses. This
comprehensive evaluation included local-scale testing to assess immediate translational
mechanical properties, parametric studies with validated numerical models to explore the
influence of various design parameters, and macro-scale shear wall simulations to evaluate
performance under realistic loading conditions.
The results of these analyses demonstrate that the proposed connections offer satisfactory
stiffness, strength, and deformation control effect. These connections effectively mitigate
damage to both timber and fasteners, thereby enhancing the overall durability of the
construction. Additionally, the research presents a robust design framework for CLTMC
connections, providing detailed guidelines for implementation in real-world projects. This
framework emphasises not only the technical performance but also the practical aspects of
construction, such as ease of assembly and potential for material reuse.
The innovative connection design introduced in this thesis represents a significant
advancement in the field of modular construction. By facilitating more efficient and flexible
assembly processes, the design has the potential to transform how CLT modules are utilised
in construction projects. Furthermore, the damage-controlled nature of the connections
suggests a substantial reduction in the permanent damage to structural materials throughout the service life of a building, thereby extending the usable lifespan of these materials. Along
with the incorporated design strategies for deconstruction and reuse, this system is expected
to contribute to greater overall sustainability.
In summary, this research provides a comprehensive review to existing challenges in
CLTMC, offering a novel approach to the identified challenges, which improves construction
efficiency, enhances flexibility, and promotes the sustainable use of materials. The findings
underscore the potential of the proposed connection system to revolutionise modular
construction practices and contribute to the sustainable development of the built environment.