Kajian terhadap kesan ke atas beban angin ke sambungan kepingan bumbung dan purlin menjadi tumpuan kajian semasa. Kegagalan bumbung didapati bermula di bahagian juntaian bumbung disebabkan oleh pergolakan yang dihasilkan daripada angin yang kuat. Walau bagaimanapun, kajian terdahulu terhad kepada bangunan yang tidak berkejuruteraan tanpa juntaian bumbung terutamanya rumah luar bandar di kawasan utara Semenanjung Malaysia. Dalam kajian ini, ukuran panjang juntaian rumah diperoleh dari kaji selidik rumah luar bandar. Kajian eksperimen menggunakan ujian tarik untuk mensimulasikan kesan beban angin pada ciri rumah pedalaman terutamanya juntaian bumbung. Oleh itu, kajian ini dijalankan untuk mengkaji daya tarikan melalui kapasiti pada sambungan kepingan bumbung dan purlin. Ujian telah dijalankan pada dua jenis bumbung iaitu, bumbung beralur dan trapezoid. Kayu jenis Meranti Merah Tua yang diklasifikasikan di bawah kumpulan kekuatan 5 digunakan sebagai purlin dan beban angin dihasilkan melalui mesin hidraulik. Dalam hal jenis bumbung beralun, daya tarikan tertinggi melalui kapasiti dipamerkan dengan ketebalan 0.28 mm dengan 200 mm juntaian (1.534 kN) diikuti oleh ketebalan 0.28 mm dengan 300 mm juntaian (1.083 kN). Sementara itu, beban maksimum yang dipamerkan oleh ketebalan 0.28 mm dengan panjang 200 mm juntaian (3.391 kN) diikuti oleh ketebalan 0.28 mm dengan panjang juntaian 300 mm (2.830 kN). Dalam hal jenis bumbung trapezoid, ketebalan 0.35 mm bersama 300 mm juntaian menunjukkan maksimum kapasiti yang tinggi (1.153 kN) diikuti oleh tebal 0.35 mm bersama 200 mm juntaian (kN). Walau bagaimanapun, beban maksimum yang digunakan dipamerkan oleh ketebalan 0.35 mm dengan panjang juntaian 200 mm (3.738 kN) diikuti dengan ketebalan 0.35 mm dengan 300 mm juntaian (3.589 kN). Ia juga telah menyatakan bahawa semakin pendek juntaian menghasilkan sambungan kepingan bumbung dan purlin yang kuat. Sambungan yang paling berkesan untuk sambungan kepingan bumbung dan purlin didapati bumbung beralun berketebalan 0.23 mm dengan panjang juntaian 200 mm.
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The study of effects on wind loading to the roof cladding and purlin connection become the focus of the present study. It is found that the failure of roof cladding initiated at the overhang roof due to turbulence created form the strong wind. However, the previous studies are limited to the non-engineered building without overhang roof mainly the rural house in northern region of Peninsular Malaysia. In this study, the typical overhang roof length was obtained through rural house survey. The experimental study using simple pull through test was performed to simulate the wind loading effect on rural house features especially at overhang roof. Therefore, the study is conducted to investigate the pull through capacity on cladding to purlin connection of rural house. The tests were conducted on two types of claddings namely, corrugated and trapezoidal roof cladding. The purlin used timber type Dark Red Meranti which classified under strength group 5 and the wind loading was applied via hydraulic jack machine. In the case of corrugated roof cladding, the highest pull through capacity exhibited by 0.28 mm thickness with 200 overhang length (1.534 kN) followed by 0.28 mm thickness with 300 mm overhang length (1.083 kN). Meanwhile, the maximum applied load exhibited by 0.28 mm thickness with 200 mm overhang length (3.391 kN) followed by 0.28 mm thickness with 300 mm overhang length (2.830 kN). In the case of trapezoidal roof cladding, 0.35 mm thickness of 300 mm overhang exhibited the highest pull through capacity (1.153 kN) followed by 0.35 mm thickness of 200 mm overhang length (kN). However, the maximum applied load exhibited by 0.35 mm thickness with 200 mm overhang length (3.738 kN) followed by 0.35 mm thickness of 300 mm length of overhang (3.589 kN). It was noted that shorter length of overhang developed stronger roof cladding to purlin connection. The most efficient connection for roof cladding to purlin connection was found to be 0.23 mm thickness of corrugated roof cladding with 200 mm overhang length.
An experimental investigation on pull through failure of roof cladding to purlin connection considering overhang roof / Nik Aisyah Sofea Nik Ahmad