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Heru Purnomo
Universitas Indonesia
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Journal : REKA RACANA

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Jarak Optimum Tie Constraint at Screws pada Cold-Formed Steel Built-Up Box Beams dengan Four-Point Flexural Loading Swastika, Tri Widya; Purnomo, Heru; Ashadi, Henki Wibowo; Sukarno, Praganif
RekaRacana: Jurnal Teknik Sipil Vol 11, No 3: November 2025
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v11i3.231

Abstract

ABSTRAKCold-formed steel (CFS) memiliki sejumlah keunggulan: antara lain kekuatan tinggi, ringan, pemasangan cepat dan praktis, tahan terhadap kebakaran, daya tahan yang baik, serta dapat didaur ulang. Namun, balok dengan penampang terbuka yang umum digunakan pada konstruksi rentan terhadap ketidakstabilan akibat ketidaksamaan letak titik geser dan titik berat. Untuk mengatasi permasalahan tersebut, salah satu solusi yang banyak digunakan adalah penggunaan balok dengan built-up section. Penelitian ini menyajikan studi eksperimental mengenai pengaruh variasi jarak tie constraint at screws pada CFS built-up box beams terhadap pembebanan lentur empat titik. Enam spesimen balok dengan bentang 1.300 mm diproduksi dari profil C75×35 dengan tebal 0,75 mm; kemudian dirakit secara berhadapan menjadi penampang kotak dengan menggunakan self-drilling screw yang dipasang sepanjang sayap untuk berfungsi sebagai tie constraint at screws. Tiga konfigurasi jarak sekrup digunakan, yaitu H; 2H; dan 5,5H; dengan H adalah tinggi penampang. Semua pengujian dilakukan pada kondisi tumpuan sederhana. Hasil pengujian menunjukkan bahwa variasi jarak tie constraint at screws berpengaruh signifikan terhadap perilaku lentur CFS built-up box beams. Berdasarkan hasil yang diperoleh, jarak sekrup 5,5H direkomendasikan untuk aplikasi desain pada kondisi pembebanan lentur empat titik.Kata kunci: cold-formed steel, built-up box beams, jarak tie constraint at screws, eksperimental ABSTRACKCold-formed steel (CFS) has many advantages, including high strength, lightweight, fast and practical installation, durability, recyclable, non-combustibility, and simple manufacturing procedures. However, since the shear center and the centroid of the cross-section do not coincide, open-section beams are prone to instability modes. To address this issue, researchers have used doubly symmetric built-up sections or built-up closed sections beams. This study presents an experimental investigation on CFS built-up box beams with varying screw spacing arrangements. Six beam specimens; each with a span of 1,300 mm; were subjected to four-point bending tests. The beams were fabricated from C75×35 profiles with a thickness of 0.75 mm, assembled face-to-face into built-up box sections using self-drilling screws positioned along the flanges to act as tie constraint at screws. Three screw spacing configurations were considered—H, 2H, and 5.5H—where H denotes the section depth. All tests were conducted under simple support conditions. Findings indicate that screw spacing significantly influences the flexural behavior of CFS built-up box beams. Based on the outcomes, a screw spacing of 5.5H is recommended for design applications under four-point bending conditions.Keywords: cold-formed steel, built-up box beams, tie constraint at screws spacing, experiment
Co-Authors Abidin, Nurul Achmad, Mohammad Adhela Septiria Wardani Afiqoh Agustin Agus Pamuji Ajeng Titah Normawati Anggraeni, Levina Anisa Nur Rahma Anjarwati, Nely Anjelin, Anggela Ermitha Arel Sabila, Thifan Ariffia, Citrani Natha Arini, Srikandi Wahyu Ariyani, Silvia Aulia Wijayanti, Luluk Dina Azzahra, Melia Ceda, Katarina Aprillia darwan darwan, darwan Devi Anggraini Dewanti, Luthfia Nilam Dewi, Melani Dhiniaty Gularso Dian Fitriyani Dian Puspita disha maulidha, yuvitha Djoeli Satridjo Dorce Sisfiani Sarimin Elly Tjahjono, Elly Epi Saptaningrum Faizatul Muna, Faizatul Muna Farhatuaini, Lia Fatah Zahrasiwi, Reiki Findy Yonanta, Apriliya Fitriya, Fathul Laila Galih Dani Septiyan Rahayu Hadi Suyono Henki W Ashadi Hidayah, Rachma Imam Jauhari Maknun, Imam Jauhari Irwan Katili, Irwan Istiqomah Kardi, Tanti Indriyani Kartadarma, Supriyatni KATNI KATNI, KATNI Komalasari, Mahilda Dea Lukitoaji, Beny Dwi Melinda, Tika Morin Prita Laura Mu'awanah, Mu'awanah Muawanah Muawanah Mudhofar, Mohammad Nur Mudhofar, Muhamad Nor Muhammad Amien, Muhammad Amien Muhammad Ridho Mumtaza, Nadhila Dzikrina Munawaroh, Raden Roro Zakiyah Murdono, Feryandy Musalamah, Sittati Muslichah, Ajeng Dafiq Natasah, Sintia Ngurah Ayu Nyoman Murniati Nikadinata, Vivian Noor Miyono Nugraha, Febby Fajar Nur Khasanah, Fitria Nurahmadani, Anisa Nurizka, Rian Nurul Bahiyah Olanda, Viona Perwitasari, Ningrum Pradita, Erni Praganif Sukarno Pregawati, Dyah Ayu Primastuti, Kurnia Pawestri Purnomo, Sidiq Qatrunnada, Assita Azka Rahma, Fitri Nur Ramadhan, Diky Ramadhani, Dina Suci Ramdhani, Fitri Galuh Ratna Widyawati Rigianti, Henry Aditia Rini Nur Hasanah Rusita Purnamasari Safira, Utin Trisna Saluky Selly Distian Cahya Siti Utami Dewi, Siti Utami Sitirahayu, Sitirahayu Soekarno, Praganif Suhardono Suhardono Sumartono, Ignatius Harry Suradi Efendi Susilo Wirawan Tri Widya Swastika, Tri Widya Triana Rahmawati Triyono, Agung Ulil, Rachma Utami, Ghina Vidliana, Tantri Wahyu Kurniawati Waoma, Adolf Wati, Ririn Asma Widyastuti, Ani widya_ningrum, wiyanda Wijayanti, Luluk Dina Aulia Yasminda, Fitria Ika Ari Yudhistari, Elsa Yulianto, Tomi Yuni Astriani Zela Septikasari, Zela