Sistem susunan organ semula jadi pada tumbuhan dinamakan sebagai filotaksis. Antara jenis filotaksis yang telah dkenalikan, filotaksis pilin merupakan jenis filotaksis yang paling banyak dijumpai. Susunan Filotaksis pilin yang unik ini membolehkan tumbuhan tumbuh dengan cekap di bawah kekurangan fisikal seperti kelembapan,
mineral, cahaya matahari terpancar dan tujuan pembiakan. Dalam kajian ini, corak Filotaksis pilin telah diaplikasikan ke dalam struktur penyokongan bangunan. Struktur penyokongan bercabang yang disimulasi berasaskan ciri and bentuk fizikal susunan Filotaksis pilin telah berjaya dimodelkan dengan sembilan cabang sepanjang tiang utama. Sebanyak empat struktur penyokongan bercabang ini telah disusunkan untuk menyokong struktur bumbung sebesar 60 meter x 60 meter. Kajian berkomputer telah dijalankan untuk mengenalpasti kelakuan struktur penyokong bercabang ini di bawah mpat keadaan beban iaitu; beban pugak sepenuhnya ke atas struktur (keadaan beban 1), beban pugak sepenuhnya ke atas struktur dan beban angin (keadaan beban 2), beban pugak separuh ke atas struktur (keadaan beban 3) dan beban pugak separuh ke atas struktur dan beban angin (keadaan beban 4). Hasil kajian berkomputer menunjukkan corak pembahagian tegangan pada struktur di bawah keadaan beban berlainan adalah seragam. Pembahagian tegangan dalam struktur menunjukkan peningkatan yang seragam dari puncar beban iaitu; beban pugak dari atas ke bawah, dan beban angin dari arah angin ke bawah angin. Namun, corak pembahagian tegangan masih berbeza antara ahli bercabang. Ahli bercabang sekunder menunjukkan tegangan terbesar di bawah keadaan beben berlainan, diikuti dengan tiang tengah dan ahli bercabang utama. Kesimpulannya, struktur penyokongan bercabang disimulasi berasaskan ciri dan bentuk fizikal susunan Filotaksis pilin mempunyai kemampuan yang cukup untuk menyokong beban pucuk dan beban angin yang dihadapinya.
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The regular arrangement system of the plant organs is botanically known as phyllotaxis. Within plenty types of phyllotaxis found in nature, spiral phyllotaxis is the most frequently found pattern. The unique arrangement of this pattern in plants has menabled them to grow more efficiently and compatible for physical constraints such as moisture and amount of light falls. In this research, the unique spiral phyllotaxis pattern has been adopted as idea for space frame. Procedures for generation of space frame modeled after spiral phyllotaxis have been purposed. It has been modeled as a branching support structure with nine cantilevered branches along the center column following the spiral phyllotaxis characteristics. A total of four branching structures modeled after spiral phyllotaxis has been used to support a space frame roof structure of length 60 meter and width 60 meter. Computational analysis has been carried out to determine the structural behavior of the new supporting structures under different loading conditions; symmetrical vertical loading (load case 1), symmetrical vertical
loading and wind loading (load case 2), asymmetrical vertical loading (load case 3) and asymmetrical vertical loading and wind loading (load case 4). From the analysis result, it has been found that the distributions of stresses in the structure under different load cases appeared to be following similar pattern. The magnitudes of stresses in members has been observed to increase from the source of external loads; the vertical loads from
top to the bottom, and the wind loads from windward to leeward. However, the stresses distribution in the branching and forking members were found to be slightly different. The stresses in the forking members are found to be greatest under different load cases. This is then followed by the center columns and finally the branching members. As a conclusion, the new structural system modeled after spiral phyllotaxis has sufficient
capacity to sustain both vertical and wind loads for the condition adopted.
Structural behaviour of a novel space frame structural system_ Ng Hwui Sien_E3_2011_875004072_00003089628_NI