טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentFrancis Mourice
SubjectInteractive Develoament of Structural-Morphological
Solutions for Space Trusses based on Infinite
Polyhedral Lattices (IPL)
DepartmentDepartment of Architecture and Town Planning
Supervisor Professor Michael Burt


Abstract

The work deals with an interactive process which includes structural analysis and morphological experiments of IPL trusses, aiming at new solutions and determination of the static response of typical elements, such as beams, plane and curved (an arch or a dome) plates built of multi-layered IPL trusses. A specific IPL structure which consists of six layers in a triangular orientation was considered.

The appearance of the IPL structure is a remarkable improvement to the commonly used two or three layers space structures, following today need for structures of large free span. Illustration of the advantages and functional possibilities due to construction of IPL trusses is presented.

The architectural and analytical background to the IPL technologies and their spatial complexity are also included in the explanation.

An important part of the methodology in the present research is devoted the development of construction of tools needed to advance solutions. Hence, the work included creation of special computer programs, combined with existing ones, which enable quantitative estimates of the examined structures and graphic presentations.

The investigation concentrates on the IPL type specified by the notation 33.4.3.4 . The principle of the "basic periodic column” which is an internal repetitive unit in the IPL structure is developed and used for all kinds of structures of that sort.

Among several illustrations, the thesis presents for the first time, a cylindrical IPL arch of 450 m span, with different orientations of the structural internal arrangement, using the “basic periodic column”. Parameter analysis has led into a linear relation of the dead to live load ratio.

Generally, the research has treated periodic and “almost periodic” systems, allowing for a more flexible design in the later case, saving considerable amount of material while increasing the possible attainable spans and the structural effectiveness.