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Johan Ardianto, Johan
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Civil Engineering, Building, Construction & Architecture Transportation

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EIGENVALUE LINEAR BUCKLING OPTIMIZATION OF MODIFIED OPEN WEB STEEL JOIST Ardianto, Johan
Jurnal Teknik Sipil Vol 14, No 4 (2018)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (611.12 KB) | DOI: 10.24002/jts.v14i4.1995

Abstract

Abstract: Open web steel joist (OWSJ) is a lightweight beam structural system that is widely used since the 1900s. It generally composed by T section as flanges on top and bottom, and L sec-tion as an open web on the centre. However, many modifications of OWSJ is commonly seen in construction sites, one of them is the usage of channel sections as top and bottom flange, and rebar steel as the open web. This configuration is mainly used to reduce cost and ease the material sup-ply. The modified OWSJ have potential to act differently than the regular one, hence scientific study need to performed to know the behaviour of the modified system. In this paper, comparison on analytical and finite element approach is conducted. The analytical method is done by mechani-cal calculation assuming there are no buckling of the flanges, web rebars are calculated individual-ly. In real structure, buckling may occur and web rebars also work concurrently. Therefore, finite element analysis with LUSAS software is conducted. The purpose of this research is to know the behaviour of OWSJ in FEM analysis. Result displays lateral torsional buckling is happen and to overcome this problem, gradation of web size is tested, resulting maximum of 10.6 % increase in capacity.
Reusability Study of Steel Leaning Column Structure Utilizing Nonlinear Static Analysis Ardianto, Johan
Jurnal Teknik Sipil Vol 15, No 1 (2018)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.491 KB) | DOI: 10.24002/jts.v15i1.3153

Abstract

Abstract: Two major earthquakes hit twoplaces in Indonesia in 2018, Palu city with 7.7 SR earthquake, and Lombok island by 6.4 SR earthquake. Many building especially concrete structure building got heavily damaged and even collapsing. Most of the damaged parts are the building’s beam-column joint, due to improper reinforcing. This damaged building is very difficult to repair due to disintegrated concrete. Thus, this building cannot be used anymore, and nothing can bedone except removing the remains and build a new structure. Because of this reason, this paper is studying a concept of reusability in structure, with the purpose to minimize structural damage in certain part of the building using leaner column theory. Leaning columns are columns that are pinned at each connection and provide no bending restraint in system. Theoretically leaning column cannot support axial and lateral loads, but since it is designed to lean on other structure, it can still resist the forces. Hence, this column is not suffering from lateral moment due to earthquake load, and the section is not exposed to damage. This paper is studying behavior of leaning column on exterior part of the structure with numerical simulation. Three-story building is modeled, one is with leaning column system, and the other is without leaning column. Performance-based design analysis with pushover method is carried. Result indicating that by using leaning column, exterior structure is not suffering from high moment when being hit byearthquake, and in other word, the exterior structure is not damaged when the earthquake comes and still can be used again.
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