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All Journal Astonjadro Eduvest - Journal of Universal Studies
Pariatmono, Pariatmono
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Aerospace Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Health Professions Neuroscience Social Sciences

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Reliability of Simple Space Truss Structure Toga Sitompul, Sang; Pariatmono, Pariatmono
ASTONJADRO Vol. 11 No. 3 (2022): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v11i3.7399

Abstract

Structural analysis has been widely applied in civil engineering. This analysis based on probability theory. Structural analysis was carried out to calculate the probability of failure and reliability of the structure. There are many cases of construction failure caused by uncertain environmental and human activities, including improper load in the external design process. In the process of designing a structure in Indonesia, complicated analysis is rarely carried out because of the complexity and impracticality of the analysis. Engineers and developers need to understand the behavior of the space truss structure and procedures in structural reliability analysis, Therefore it is necessary to simplify the structure in the analysis of the structure. This paper has carried out a structural reliability analysis using simple space truss modeling to understand its structural behavior and the principles of structural analysis under indeterministic load with simplified methods to make it more practical. A comparison of struktural analysis was carried out on 3 methods of structural analysis, manual calculation, ETABS v9.7.4, and MStower V6.20.1.11. The results of the three methods have the same value so that the structural analysis using MStower is reliable. In the loading approach, the load that is developed into a population of possible loads that can occur. Monte Carlo simulation is used by generate a sample of the load population that can represent the number of possible loads so as to reduce the number of analyzes. Random value generation methods were compared to get a more effective and practical method. The failure criteria are determined to obtain the limit state function of the structure so that the probability of failure and the reliability of the structure can be calculated. In this study, the limit state function was obtained in compression member with a 67% probability of failure and 33% reliability of the structure.
Reliability Analysis for Dynamic Behaviour, Stiffness, and Strength of Existing Steel Truss Bridge BH77 Suseno, Dimas Aryo; Pariatmono, Pariatmono
Eduvest - Journal of Universal Studies Vol. 4 No. 11 (2024): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v4i11.49989

Abstract

Railway bridges are old, especially on the Sumatra island and according to earthquake map on 2017 version show an increased risk, it is necessary to analyze the reliability of dynamic behaviour to extend the bridge life and damage can be detected early. The bridge reliability was assessed in terms of natural frequency, deflection, and internal force . The study was conducted on the BH77 Railway Bridge in Tegineneng-Lampung, a through truss type. Reliability analysis with a non-deterministic approach, using the probability concept, variability used is the dimensions of steel profiles based on fabrication drawings and field measurements. The research uses secondary data, one of which is measurement of the circumference of the steel cross section, that influenced by the paint layer, where the paint thickness sample to correct and obtain the actual dimensions. Dynamic behaviour analysis, consisting of modal analysis, Fast Fourier Transform, time history, and First Order Reliabilty Method. The analysis results showed the effect of steel dimension correction compared to the fabrication drawings did not have a significant effect on the changes in the values of natural frequencies, mode shapes, deflections, and internal forces. The reliability of the dynamic behaviour obtained was 99% at all reviews. Which indicates that the bridge is safe against potential resonance, the bridge stiffness is still high, and the axial+moment capacity is still sufficient against static & earthquake loads, as well as good bridge maintenance. The largest deflection point as a reference for placing strain and vibration gauges on structural health monitoring systems.
Co-Authors Suseno, Dimas Aryo Toga Sitompul, Sang