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Journal : NU-JST

Permodelan Perilaku Daktail Balok T pada Beton Mutu Tinggi Syaikhani, Ahmad; Tjitradi2, Darmansyah; Chairunnisa, Nursiah
Nusantara Journal of Science and Technology Vol 2 No 1 (2025): Published in May of 2025
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat (LPPM) Universitas Nahdlatul Ulama Kalimantan Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69959/nujst.v2i1.181

Abstract

The use of reinforced concrete beams using a slender and high quality make manufacturing more efficient, but it could be a problem, especially in terms of deflection and torque occurs. Besides the issue of deflection and torsion of reinforced concrete beams are also vulnerable to shear failure, because the beam will suddenly fall without notice. By increasing the volume of concrete, it will increase the ability of beam bending, shear, ductility and strengthen the torsion beam, but if increasing the volume of concrete will increase the cost and increase the space or want a beam to beam slim in terms of aesthetics . This experiment without increasing the volume of concrete but do in the area of compressed concrete curbs and closed. Experimental models used are high quality concrete T beam with a length of 3.85 m . The number of flexural steel reinforcement 3 pieces with a diameter of 16 mm bending, body reinforcement of 8 mm diameter, 8 mm diameter tensile reinforcement and stirrups of 8 mm diameter (Ramaswamy, 2006). Furthermore, the implementation of a model created in ANSYS with the concrete material was modeled as SOLID 65, Steel material is modeled with SOLID 45, and reinforcing steel were modeled as LINK 8. Then redesign beam experiments with the same capacity so that the beam implementation in detail as reinforced concrete beams with a span length profiles T (L) 3.85 m, height (h) 350 mm, web beam width (bw) 150 mm, effective flens width (be) 375 mm, 450 mm and 600 mm. Beam profile T design used double the number of reinforcement rebars press 6 pieces of 10 mm diameter, reinforced pull 3 pieces of 22 mm diameter, and stirrups were used diameter of 10 mm. The quality of concrete used (fc') = 65 MPa. Flexural yield stress and tensile steel reinforcement is used (fy) = 400 MPa and reinforcement steel stirrups used (fy) = 240 MPa. Analysis of the modeling is done using the finite element method with a variation of the cross bar spacing of 50 mm, 75 mm, and 100 mm. The results showed that the load at the first crack that can be accepted on a concrete T beams with increasingly high quality meeting the local press stirrup spacing increased ( but less significant influence ). Then when the ultimate load on the beam can be accepted T on high strength concrete with closed the local press stirrup spacing increased ( significant influence ). Sengkang also affect the crack, the closer the distance stirrup in the press area will strengthen the concrete and reduce the widening cracks, as seen at the time of the first concrete crack and crack mangalami ultimate. While the effective width also affected, the greater the effective width of high strength concrete T beams will increase the moment capable of being held, so that the beam is getting stronger and greater ductility.
Kajian Struktur Baja Sebagai Alternatif Review Design Struktur Beton Bertulang (Studi Kasus Bangunan 2 Lantai Puskesmas 9 Nopember Banjarmasin) Syaikhani, Ahmad
Nusantara Journal of Science and Technology Vol 2 No 1 (2025): Published in May of 2025
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat (LPPM) Universitas Nahdlatul Ulama Kalimantan Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69959/nujst.v2i1.188

Abstract

Current building construction uses more concrete structures, not many of which use steel structures. One of the advantages of using steel is that steel work is faster with simpler steel structure installation support tools, so that it can save procurement costs and time. This study aims to plan the 2-Storey Building of the Puskesmas 9 November Banjarmasin which initially used a reinforced concrete structure into a steel structure. The research method used is to plan columns and beams in the form of steel using the SAP2000 application and earthquake loading according to SNI 1726:2019. Through the calculation of loading and application of structural loads in SAP2000, the value of the ultimate load (Pu) acting on the column and the ultimate moment (Mu) on the beam are obtained. The value of the ultimate load (Pu) will affect the amount of the factored nominal load (?Pn), because the factored nominal load (?Pn) must be greater than the ultimate load (Pu) so that the building structure is safe. However, if the nominal factored load (?Pn) is too large than the ultimate load (Pu), it will cause waste in the building structure (column). From the calculation results, the WF steel profile used is 200.200.10.16 fy = 240 MPa for change a 30x30 column 1st floor and 100.100.6.8 fy = 240 MPa for change a 15x30 at column 2nd floof. On the 1st floor beam measuring 20x30 using the WF steel profile 200.150.6.9 fy = 240 MPa and on the 20x30 beams on floors 2 using the WF steel profile 200.150.6.9 fy = 240 Mpa or fy=450 MPa.