טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentEngelhardt Livna
SubjectSparse Plate Trusses - Morphological Approach and
Structural Analysis
DepartmentDepartment of Architecture and Town Planning
Supervisors Professor Michael Burt
Professor Oren Vilnay


Abstract

Sparse Plate-Trusses are multilayered structures, made of bars connected by hinge joints. These trusses have high regularity, low density of bars, and notable structural performance.


The research objective is to demonstrate morphologically defined possibilities of improving the structural capacity of Sparse Plate-Trusses, while reducing the amount of material per volume. The basic hypothesis is that this can be achieved by increasing the structural height of a plate-truss while reducing its spatial density (number of bars per volume) and preserving its stability.


Sparse Plate-Trusses can be derived from Infinite Polyhedra Lattices. Study of the morphological parameters determining the spatial density of edges of I.P.L., led to four strategies for reducing this density:


a)   Adding octahedra along the polyhedron’s axes.


b)   Increasing the polyhedron’s subdivision frequency.


c)   Reducing the number of axes meeting at a joint.


e)   Eliminating redundant bars.


The computer was used to:


a)   Generate and present the graphical data.


b)   Process the structural analyses.


c)   Calculate the stiffness coefficients.


Comparative evaluation of the stiffness coefficients of the considered trusses shows the morphological possibilities of improving the structural performance of Sparse Plate-Trusses.