An investigation on construction sequence of an arch-shaped tensegrity structure
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Date
2019-06
Authors
Muhammad Nasrul Asraf Bin Rosli
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Abstract
The focus of this study is irregular multi-layer arch-shaped prism tensegrity. A 4
layer practical scale arch-shaped tensegrity structure with span of 4m and height of 2m
was constructed in order to study the sequence of construction and effect of self-weight
on the final configuration. 1.5mm steel wire rope and 38.1 mm aluminum tube were
used for tension and compression members, respectively. The study started with form
finding process where a computing tool that uses a linear approach by combining length
relationship condition and force balance equation was used. From the form-finding
results, force ratios needed to be applied were determined. Based on cable strength data,
the level of pre-stressing force to be applied to each cable were then decided. The pre
stressing forces in the cables were applied during construction through forced elongation
achieved by means of turn-buckles. Through the erection of the 4-layer arch-shaped
tensegrity model, the construction sequence starting from first layer and proceeding until
the final fourth layer was formulated, tested and finally successfully established. It was
found that proper temporary support of ends of compression member and sufficient level
of pre-stressing force in cable members are crucial to maintain rigidity of the tensegrity
structure. Self-weight of the compression members was found to affect the final height
as well as the span of the arch-shaped tensegrity structure.