Sains Malaysiana 52(12)(2023): 3853-3865

http://doi.org/10.17576/jsm-2023-5212-17

The Geometrical Properties of Round Bamboo of Gigantochloa levis and Their Effects on Construction Design

(Sifat Geometri Batang Buluh Gigantochloa levis dan Kesannya terhadap Reka Bentuk Pembinaan)

MOHD JAMIL ABDUL WAHAB* & NOR MARZUINA F.K. NAYSIR

Forest Products Division, Forest Research Institute Malaysia, 52109 Kepong, Selangor, Malaysia

Diserahkan: 17 April 2023/Diterima: 20 Disember 2023

Abstract

Round bamboo is reviewed as a highly potential material for building components. However, the assessable data of the geometrical variability of Malaysian bamboos proposed as structural members are greatly lacking. A study was conducted to establish the geometric properties of Gigantochloa levis culms and to derive the important parameters that will affect engineering design. The evaluations were based on the internode length, culm diameter, wall thickness, and the second moment of area with respect to the height of the culm. Most internode sections measured between 35 and 50 cm. An internodal crack could severely change the cross-sectional geometry of the culm. Two major factors concerning culm diameter that need to be considered in the design are diameter shrinkage and taper rate. The diameter of a culm was fairly equal within the height of 1 to 5 m and decreased from 5 m onwards. Upon drying, the culm of the larger diameter tended to shrink more than the smaller one. Thickness irregularity around the circumference of the internode wall was minor. The shrinkage of the internode wall was within 20%. The selection of culms for construction is best between the height of 1 and 5 m whereby the internodal length is more consistent.

Keywords: Beam; column; dimensional measurements; second moment of area; structure

Abstrak

Buluh bulat dikaji sebagai suatu bahan yang amat berpotensi untuk komponen bangunan. Walau bagaimanapun, data keragaman geometri untuk jenis buluh di Malaysia yang dicadangkan untuk kegunaan struktur adalah sangat kurang. Satu kajian telah dijalankan untuk menubuhkan sifat geometri batang buluh Gigantochloa levis dan seterusnya menerbitkan parameter penting yang akan mempengaruhi reka bentuk kejuruteraan. Penilaian dijalankan berdasarkan panjang ruas, diameter batang, tebal dinding dan momen luas kedua, dengan merujuk kepada ketinggian batang. Kebanyakan bahagian ruas berukuran antara 35 hingga 50 cm panjang.  Keretakan ruas boleh mengubah geometri keratan rentas batang. Dua faktor utama berkaitan diameter batang buluh yang perlu dititik beratkan dalam reka bentuk adalah pengecutan dan kadar tirus. Diameter batang buluh adalah hampir seragam pada ketinggian 1 hingga 5 m dan berkurang daripada 5 m ke atas. Sewaktu pengeringan, batang buluh yang berdiameter lebih besar mempunyai kecenderungan untuk mengecut dengan peratusan yang lebih tinggi berbanding yang lebih kecil. Kadar ketidakteraturan tebal di sekeliling dinding ruas pula adalah rendah. Kadar pengecutan dinding ruas adalah di bawah 20%. Pemilihan batang buluh untuk tujuan pembinaan adalah paling sesuai pada ketinggian antara 1 hingga 5 meter yang panjang ruasnya adalah lebih seragam.

Kata kunci: Momen luas kedua; pengukuran dimensi; rasuk; struktur; tiang

rujukan

Anokye, R., Kalong, R.M., Bakar, E.S., Ratnasingam, J., Jawaid, M. & Awang, K. 2014. Variations in moisture content affect the shrinkage of Gigantochloa scortechinii and Bambusa vulgaris at different heights of the bamboo culm. BioResources 9(4): 7484-7493.

Asniza, M., Alia Syahirah, Y., Wan Tarmeze, W.A. & Anwar, U.M.K. 2022. Penyelidikan dan Pembangunan (R&D) Buluh di FRIM. FRIM Reports No. 119. Kepong: Institut Penyelidikan Perhutanan Malaysia.

Asniza, M., Mohd Fahmi, A. & Mohd Khairun Anwar, U. 2022. Distribution and general properties of Malaysian bamboo: A review. In Bamboo: Perspective, Technology and Application, edited by Siti Zaharah, K.M., Azrin Hani, A.R., Wan Amizah, W.J., Mohd Nazrul, R. & Mazatusziha, A. Batu Pahat: Penerbit UTHM. pp. 1-7.

Azmy, M. 1993. Relationships between height, diameter at breast height (DBH) and culm weight of three Malaysian bamboos. Journal of Tropical Forest Science 6: 85-86.

Azmy, M., Sulaiman, O., Razak, W. & Rokiah, H. 2011. Physical characteristics and weight relationship of Gigantochloa scortechinii (buluh semantan) 1-, 2- and 3-year old natural stand bamboos. Pertanika Journal of Tropical Agricultural Science 34: 25-32.

Taylor, D., Kinane, B., Sweeney, C., Sweetnam, D., O’Reilly, P. & Duan, K. 2014. The biomechanics of bamboo: Investigating the role of the nodes. Wood Science Technology 49: 345-357.

Esti, A.N. 2016. The potential of bamboo as building material in organic shaped buildings. Procedia - Social and Behavioral Sciences 216: 30-38.

Fadhlia, F.A.R.N., Paridah, M.T., Anwar, U.M.K., Juliana, A.H. & Zaidon, A. 2017. Enhancing mechanical properties and dimensional stability of phenolic resin-treated plybamboo. Journal of Tropical Forest Science 29: 19-29.

ISO (International Organization for Standardization). 2019. ISO 22157 – Bamboo Structures –Determination of Physical and Mechanical Properties of Bamboo Culms – Test Methods. ISO, Geneva.

Kamruzzaman, M., Saha, S.K., Bose, A.K. & Islam, M.N. 2008. Effects of age and height on physical and mechanical properties of bamboo. Journal of Tropical Forest Science 20: 211-217.

Lorenzo, R. & Mimendi, L. 2019. Digital workflow for the accurate computation of the geometric properties of bamboo culms for structural applications. MATEC Web of Conferences 275: 01024.

Lorenzo, R., Mimendi, L. & Li, H. 2019. Digital analysis of the geometric variability of bamboo poles in bending. MATEC Web of Conferences 275: 01007.

Malaysian Timber Industry Board (MTIB). 2022. Memorandum of understanding on bamboo industries development. Maskayu October 2022. Kuala Lumpur: Malaysian Timber Industry Board.

Meng, J. & Sun, D.G. 2018. Effects of node distribution on bending deformation of bamboo. Journal of Tropical Forest Science 30: 554-559.

Muhammad Fahim, Muhammad Haris, Wajid Khan & Saeed Zaman. 2022. Bamboo as construction material: Prospects and challenges. Advances in Science and Technology Research Journal 16: 165-175.

Nordahlia, A.S., Anwar, U.M.K., Hamdan, H., Zaidon, A., Paridah, M.T. & Abd Razak, O. 2012. Effects of age and height on selected properties of Malaysian bamboo (Gigantochloa levis). Journal of Tropical Forest Science 24: 102-109.

Razak, W., Mohd Tamizi, M., Othman, S., Aminuddin, M., Affendy, H. & Izyan, K. 2010. Anatomical and physical properties of cultivated two- and four-year-old Bambusa vulgaris. Sains Malaysiana39(4): 571-579.

Shao, Z.P., Zhou, L., Liu, Y.M., Wu, Z.M. & Arnaud, C. 2010. Differences in structure and strength between internode and node sections of moso bamboo. Journal of Tropical Forest Science 22: 133-138.

Shima, H., Sato, M. & Inoue, A. 2016. Self-adaptive formation of uneven node spacings in wild bamboo. Physical Review E 93: 022406.

Zakikhani, P., Rizal, Z., Mohamed, T.H.S. & Dayang, L.M. 2017. Morphological, mechanical, and physical properties of four bamboo species. BioResources 12: 2479-2495.

*Pengarang untuk surat-menyurat; email: mohdjamil@frim.gov.my