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Studi Analitik Karakteristik Penampang Baja Profil-I Sabril Haris
Siklus : Jurnal Teknik Sipil Vol. 6 No. 1 (2020)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/siklus.v6i1.3736


Paper ini menyajikan hasil studi analitik tentang besaran karakteristik penampang baja profil-I berupa modulus elastis (Sx) dan modulus plastis penampang (Zx). Faktor bentuk penampang, yang merupakan perbandingan nilai Zx terhadap Sx, merupakan besaran utama yang digunakan untuk menghitung kapasitas momen plastis penampang baja. Khusus untuk baja profil-I yang dibuat dengan metoda canai panas, pada bidang pertemuan antara bagian sayap dan bagian badan terdapat bagian penampang seperempat lingkaran cekung yang memberikan kontribusi untuk nilai total besaran karakteristik penampang. Dalam penelitian ini, besaran karakteristik penampang dihitung dan dianalisis dengan menggunakan besaran karakteristik penampang dasar persegi panjang dan lingkaran. Analisa hasil perhitungan menunjukkan bahwa bagian penampang seperempat lingkaran cekung tersebut memberikan kontribusi yang konsisten terhadap nilai luas, modulus elastis dan plastis penampang, yakni dalam rentang sebesar 1.0 – 4,7%. Dari hasil penelitian ini juga diperoleh bahwa faktor bentuk penampang untuk profil-I yang umum digunakan berada dalam rentang nilai 1,102 – 1,147. Perhitungan nilai faktor bentuk penampang dengan dan tanpa mengikutsertakan bagian penampang seperempat lingkaran cekung memberikan hasil yang hampir sama dengan selisih rata-rata sebesar 0,001. Modulus plastis penampang dapat dihitung dengan menggunakan formula sederhana yang diusulkan pada artikel ini dengan tingkat akurasi yang sangat baik dengan deviasi sebesar 1.2 %. Untuk semua jenis ukuran penampang profil-I, formula ini bisa digunakan untuk menghitung modulus plastis penampang secara lebih sederhana. This paper presents the results of an analytical study of the characteristics of the I-profile steel cross-section in the form of elastic modulus (Sx) and plastic section modulus (Zx). The shape factor of the section, which is defined as the ratio of the value of Zx to Sx, is the principal quantity used to calculate the plastic cross-section moment capacity. Specifically for I-profile steels made by the hot-rolled process, in the area of ​​the junction between the flange and the web, there is a concave cross-section that contributes to the total value of the section characteristic. In this study, the magnitude of the cross-sectional characteristics is calculated and analyzed using the magnitude of the basic cross-section characteristics of rectangles and circles. Analysis of the calculation results shows that the cross-section of the concave quarter circle provides a consistent contribution to the area, elastic and plastic section modulus, which is in the range of 1.0 - 4.7%. From the results of this study, it was also found that the shape factor for the I-profile commonly used is in the range of values ​​1.102 - 1.147. Calculation of the cross-section form factor values ​​with and without including the concave quarter circle gives results that are almost the same as the average difference of 0.001. The plastic modulus of the cross-section can be calculated using the simple formula proposed in this article with a very good degree of accuracy with a deviation of 1.2%. For all types of I-profile cross-section sizes, this formula can be used to calculate the plastic section modulus easily.
Racic : Rab Construction Research Vol 3 No 01 (2018): Terbitan Kelima Bulan Juni 2018
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (751.21 KB)


Roof truss of lightweight steel has been used for any types of construction. Functioned as the truss, this could makes variations of roof truss configuration which depended on construction necessity and performance on certain span. Then, this research analyzed the configurations for short span and intermediate span. The result will recommend roof truss configuration which used light weight steel. The analysis used software SAP 2000 v.19. The lightweight steel section is channel section of C 75.35.0,75 which is found on any store building. In general, the result of this analysis were tensile and compressive ratio which is obtained by comparison of internal force and section capacity. This calculation also referred to SNI 7971:2013 code. Then, tensile and compression ratio are obtained less than 0,9 for each configurations and spans. So, the structure are stable. However, Fink and Cremona configuration have considerable results which give the smallest tensile and compression ratio compared to another configurations for short span and intermediate span respectively. It can be concluded that Fink and Cremona were recommended for lightweight steel truss for short spans and intermediate spans. Lightweight steel section C 75.35.0,75 also can be used in this configuration.