The systems, processes, and organisms optimized for the evolution of nature over several hundred million years have helped designers and architects seeking improved and innovative solutions. Inspired by the shape and function of nature, some architects have created great architectures by finding and applying new design sources from nature's elements. The beautiful and mysterious nature landscape surrounding us not only gives us a new appearance for the four seasons, but also provides the source of new ideas for human. When looking at nature elements such as trees, flowers, animals, and ocean organisms, architects can find unusual perspectives, visually interesting ideas, special structures, creative details and innovative mechanisms. Most modern cities are full of buildings like the shape of supermarkets and boxes, if possible, architects should try to satisfy human emotions with beautiful scenery and natural closeness through environmental architecture. When planning for future cities and constructing new buildings, how to satisfy our yearning for a harmonious interaction with nature, and how the historic characteristics of buildings are shown to be presence. All of these are related to our fundamental human feelings and emotions, can improve holistic interrelationships between buildings and nature for human life. Nature-inspired biomimicry is a way of observing the natural world to find design solutions that may enable us to create the concepts of new building design with sustainable and healthy. This study is to analyze what are nature inspirations for the visual and conception building designs and what are the characteristic of innovative designs and technologies inspired by nature.
The objective of this study is to analysis the mechanical characteristics on the geometric nonlinear behavior of radial cable roof systems for long span retractable cable roof structures. The retractable roof is designed as a full control system to overcome extreme outdoor environments such as extreme hot or cold weather, strong wind or sunlight, and the cable roof greatly can reduce roof weight compared to other rigid structural system. A retractable cable roof system is a type of structures in which the part of entire roof can be opened and closed. The radial cable roof is an effective structural system for large span retractable roofs, the outer perimeter of the roof is a fixed membrane roof and the middle part is a roof that can be opened and closed. The double arrangement cables of a radial cable truss roof system with reverse curvature works more effectively as a load bearing cables, the cable system can carry vertical load in up and downward direction. In this paper, to analyze the mechanical characteristics of a radial cable roof system with central posts, the authors will investigate the tensile forces of bearing cables, stabilized cables, ring cables, and the deflection of roof according to the height of the post or hub that affects the sag ratio of cable truss. The tensile forces of the cables and the deflection of the roof are compared for the cases when the retractable roof is closed and opened. Keywords : Radial cable roof systems, Geometric nonlinear behavior, Long span retractable cable roof structures
Cable structures are lightweight structures of flexible type, cable members have only axial stiffness related to tension, they can carry neither bending nor compression. This study is the analysis of cable truss systems are composed of upper and low cables by connecting bracing cables, the structural principle is based on a tensegrity system by using bracing tension members, discontinuous compression members and continuous tension members. A hanging roof of cable truss system is too flexible against vertical loads, most cable members are stabilized by connecting the prestressed upper and lower cable by bracing cables. A cable truss roof system is formed by adding a set of cables with reverse curvature to the suspension cables. With the sets of cables having opposite curvature to each other, cable truss is able to carry vertical load in both upward and downward direction with equal effectiveness, and then a cable truss acts as load bearing elements by the assemble of ridge cables, valley cables and bracing cables. This paper will be shown the geometric non-linear analysis result of cable truss systems with various sag ratio for deflections and tensile forces, the analytical results are compared with the results of other researchers.
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