For structural engineers tubular structures are most interesting for buildings with larger spans. For architects other tendencies in the design of tubular structures of buildings are valid which have an influence on a much smaller scale, more intense, often more complex than just large spans. From the 1970-ies onwards high tech architectural caught much attention. From 1995 onwards, accelerated by the intense use of the computer, attention came also on deviating geometrical forms of buildings, the fluent form buildings and the free form buildings. 'Fluent' forms of buildings have geometries which can be derived by mathematical formulas and hence are more or less communicable. Free forms are free forms and literally cannot be generated by mathematical forms. The form of these buildings has to be established by the architect and other parties just have to follow. Yet the future of tubular structures is only colored by these pilot projects. The majority of applications is still quite functional and straightforward.
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