Tumpuan kajian ini adalah tensegriti prisma berbentuk lengkung pelbagai lapisan yang tidak teratur. Struktur tensegriti berbentuk lengkung terdiri daripada empat lapisan praktikal dengan panjang 4m dan ketinggian 2m dibina untuk mengkaji urutan pembinaan dan kesan berat badan pada konfigurasi akhir. Tali dawai keluli 1.5mm dan tiub aluminium 38.1 mm digunakan untuk anggota ketegangan dan pemampatan. Kajian ini bermula dengan proses penentuan bentuk dimana kaedah pengiraan komputer yang menggunakan pendekatan linear dengan menggabungkan keadaan hubungan panjang dan persamaan kesimbangan daya digunakan. Daripada hasil carian bentuk, nisbah daya yang diperlukan untuk digunakan ditentukan. Berdasarkan data kekuatan kabel, tahap tekanan pra-tekanan untuk digunakan pada setiap kabel ditentukan. Daya pra-tekanan di dalam kabel ddiperkenalkan melalui pemanjangan kabel. Melalui pendirian model tensegriti berbentuk lengkung 4 lapisan, urutan pembinaan bermula dari lapisan pertama dan meneruskan sehingga lapisan keempat akhir dirumuskan, diuji dan akhirnya berjaya ditubuhkan. Adalah didapati bahawa sokongan sementara yang tepat dari hujung anggota mampatan dan tahap tekanan pra-tekanan yang mencukupi dalam anggota kabel adalah penting untuk mengekalkan keteguhan struktur ketegangan. Berat badan anggota mampatan didapati menjejaskan ketinggian akhir serta panjang struktur ketegangan berbentuk lengkung.
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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.
An investigation on construction sequence of an arch-shaped tensegrity structure / Muhammad Nasrul Asraf Rosli