The introduction of creases into thin sheets has a dramatic effect on their global mechanical properties. This can be observed by manipulating a crumpled piece of paper which has been unfolded; it no longer deforms in the same way as the original sheet. Creases have typically been modelled as singular hinge lines, often accompanied by a torsional spring to provide some opening resistance; however, the appropriate stiffness of these springs is unclear. In reality, creases have a discrete geometry based on the method they were formed. This dissertation investigates the flexural behaviour of a creased thin metallic strip and the influence of the crease geometry. When a strip is bent perpendicular to the crease, putting the crease region in tension and the strip edges in compression, initially torsional deformations occur which ultimately coalesce into a central localised flattened region. An analytical model of this flexural behaviour is developed, which idealises the crease as an initially circular segment. Predictions show the bending resistance increases as the crease decreases in size. The model predictions are compared to finite element analysis and experimental results showing excellent agreement. When a strip is bent in the opposite direction, with the crease region in compression and the strip edges in tension, a bistable snap-through occurs. The deformed shape is characterised by a sharp vertex on the crease line. An analytical model is developed by generalising a Gauss mapping approach, and used to predict the deformed shape. These predictions match experimental results well. This dissertation provides an understanding of the mechanics of creased thin strips, where the crease is given a discrete geometry, and explores the nature of localisation. It also provides the foundation to explore the mechanics of thin sheets featuring a network of creases. This offers the opportunity to improve the efficiency of thin shell structures by using creasing to optimise the mechanics, leading to reduced material use, more sustainable construction, and fuel savings from lighter vehicles.

This research delves into the feasibility and effectiveness of utilizing wind-powered shading systems in architectural design to enhance energy efficiency and promote environmental sustainability. With an ever increasing demand for energy in commercial buildings, particularly in heating, cooling, and lighting, innovative solutions are crucial in addressing these challenges. The proposed solution centers on dynamic shading systems that adjust autonomously to environmental factors, thanks to advancements in construction and information technologies. Piezoelectric wind harnessing devices are at the heart of this investigation, powering kinetic shading systems that offer a renewable and eco-friendly alternative to traditional energy sources. However, implementing such systems presents technical challenges such as device optimization, compatibility with dynamic movement, and reliability in real-world applications. Through empirical research and experimentation, these challenges are comprehensively explored and addressed. The study seeks to assess the practicality and effectiveness of wind-powered shading systems in reducing energy consumption, improving thermal comfort, and enhancing overall building performance. By considering factors such as architectural integration, heat, light management, and adaptability to environmental conditions, the research aims to contribute to the advancement of sustainable building practices. Ultimately, the findings provide valuable insights into the potential of wind-powered shading systems to mitigate energy usage and promote environmental stewardship in architectural design. / Master of Architecture / This Thesis Explores the design and evaluation of origami-inspired kinetic shading system driven by piezoelectric technology to convert wind power to electricity. By examining the behavior and utility of this piezoelectric dynamic folding shading system, it enhances our understanding of how to integrate renewable energy into building designs for a more sustainable future.