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All Journal Construction and Material Journal JURNAL POLI-TEKNOLOGI
Tri Widya Swastika
Politeknik Negeri Jakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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PEMBANDINGAN SIMPANGAN DAN CAPACITY RATIO PADA PEMODELAN GEDUNG DENGAN DAN TANPA INITIAL SWAY IMPERFECTION Retno Ajeng Zulia Octavia; Tri Widya Swastika
Construction and Material Journal Vol. 2 No. 2 (2020): Construction and Material Journal Vol. 2 No. 2 Juli 2020
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v2i2.3091

Abstract

Initial Sway Imperfection is one of the stability requirements for structural steel design structure, as explained in SNI 1729-2015 the specification of steel building. It was also mentioned that initial sway imperfection can be simulated by giving notional load on the structure of steel building model which is 0,002 of the gravity load on each floor. However, consultants and practitioners never apply initial sway imperfection in the calculation of stability, even though it is very important in buckling prediction, especially in column section. This research was compared drift and capacity ratio in column section, with and without initial sway imperfection using 3D model of 7 floors building. The method that we used is DAM (Direct Analysis Method). In the first model without notional load and the second model by applying notional load. The results shows that the biggest drift value in the X direction increase from 0,2 mm to 135,2 mm, and in the Y direction increase from 0,1 mm to 55,4 mm, the capacity ratio increase from 0,04% to 16,73%. The drift value with initial sway imperfection exceeds the limits allowed by SNI 1726-2012, therefore it needs to enlarge column section. At the same time, the capacity ratio with initial sway imperfection is within the limit which is less than 1. Keywords: Initial Sway Imperfection, Notional Load, Deviation, Capacity Ratio.
INITIAL GEOMETRIC IMPERFECTIONS AKIBAT TEKUK SINGLE CURVATURE MOMENT PADA BALOK BAJA SEDERHANA Erlina Yanuarini; Yanuar Setiawan; Tri Widya Swastika
Construction and Material Journal Vol. 2 No. 3 (2020): Construction and Material Journal Vol. 2 No. 3 November 2020
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v2i3.3471

Abstract

Steel beams are susceptible to initial geometric imperfections due to improper fabrication and installation processes. Consequently, long steel beams without stiffening are prone to bending due to lateral torsion. The purpose of this study is to determine the effect of variations in the initial geometric imperfections of Single Curvature-Moment (SCM) on the moment, total displacement, displacement in the X direction (U1), displacement in the Y direction (U2), and twist. This study used an RH profile with a compact flange and web. The boundary condition used is a simple beam with an initial geometric imperfection due to single moment-curvature (SCM) bending. The variations used are the initial geometric imperfections values of SCM 0 mm (without initial geometric imperfections), SR5 (with initial geometric imperfections of 5 mm), and SR10 (with initial geometric imperfections of 10 mm). Initial geometric imperfections of SCM in steel beam decreased moment capacities up to more than 2% in elastic conditions and 12% in plastic states. This SR10 beam is also a beam that has a displacement of the X-axis (U1 = -203,960 mm), a displacement of the Y-axis (U2 = -255,615 mm), and the most significant twist (28,179 °). Keywords: Buckle, Initial Geometric Imperfections, Single Curvature-Moment.
Pengaruh Karakteristik Pekerjaan Dan Stres Kerja Terhadap Keinginan Pindah Tempat Kerja Pada Pekerja Proyek Konstruksi Fajar Susilowati; Tri Widya Swastika
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2402

Abstract

Human resources are seen as an essential asset in a company because man is a dynamic resource and always needed in every process of production of goods and services. Therefore, this research was performed to analyze the influence of Jobs’ Characteristics and Work Stress on Turnover Intention. This research uses Quantitative Data by Questionnaire Method. The result of data processing shows that Work Stress has a stronger influence on Turnover Intention than Jobs Characteristics. Both of these variables impact amounted to 0.65 of the employee turnover intentions. It can calculate that determination coefficient 42.3%, which means that the variable Jobs Characteristic and Work Stress have contributed amounted to 42.3% of the employee turnover intentions, while other variables determine 57.7%. The indicator most influence on turnover intention in construction employees was the differences in value between the company and its employees. 
REDESIGN STRUKTUR ATAS BANGUNAN CELLA CAKUNG LOGISTIC WAREHOUSE Fruisttha Aulia Cahyani; Tri Widya Swastika
Construction and Material Journal Vol. 8 No. 1 (2026): Construction and Material Journal Vol. 8 No. 1 Mei 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v8i1.7724

Abstract

Efficient and code-compliant steel structural design is essential in the development of industrial buildings such as logistic warehouses. This study aims to conduct a comparative evaluation of the structural capacity of steel elements between the existing design and an alternative design in logistic warehouse building located in Jakarta, in which the existing structure uses a combination of concrete and steel materials, while the alternative design adopts a fully steel structural system. The analysis focuses on primary structural elements, columns with King Cross profile and beams with Castellated. Structural modelling and analysis were performed using SAP2000, referring to SNI 1729:2020 for steel structure design and SNI 1726:2019 for seismic loading. The alternative design was developed using a preliminary design approach through a trial-and-error method to obtain section dimensions with acceptable capacity ratios (less than 1.0). The comparison parameters include section dimensions, axial and flexural capacities, and element capacity ratios. The results indicate that several elements in the existing structure exhibit capacity ratios exceeding 1.0, whereas the proposed alternative design provides sections that satisfy the required strength criteria. This study limited to the evaluation of primary structural elements and does not include connection design; therefore, the findings are expected to provide an initial reference for selecting more adequate steel sections in similar warehouse structures.
Co-Authors Fajar Susilowati Fruisttha Aulia Cahyani Retno Ajeng Zulia Octavia Yanuar Setiawan Yanuarini, Erlina