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All Journal Journal of the Civil Engineering Forum Civil Engineering Dimension Jurnal Riset Rekayasa Sipil Journal of the Civil Engineering Forum

Angga Fajar Setiawan

Civil And Environmental Engineering Department, Enginering Faculty, Universitas Gadjah Mada

Author-ID : 3517214

Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

Published : 8 Documents Claim Missing Document

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Articles

Study of Laminated Veneer Lumber (LVL) Sengon to Concrete Joint Using Two-Dimensional Numerical Simulation Urwatul Wusqo; Ali Awaludin; Angga Fajar Setiawan; Inggar Septhia Irawati
Journal of the Civil Engineering Forum Vol. 5 No. 3 (September 2019)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The connection system is a critical part of Timber – Concrete Composite (TCC) floor structures. The behaviour of the connection needs to be known to predict the behaviour of composite structure accurately. Screws are one kind of connector that mostly used in the composite structure due to its installation ease and high withdrawal strength. This study carried out a two-dimensional numerical simulation to examine the behaviour of LVL Sengon-concrete joint using OpenSees software. The lag screw used to connect LVL Sengon and concrete. In this simulation, the screw was assumed as a beam with hinges element that supported by a set of springs representing the strength of LVL Sengon and concrete. Some input parameters for this simulation were obtained from the material test and previous research. The effect of secondary axial force was considered into the load-displacement curve resulted from the numerical simulation. This study performed several simulations towards the variation of the screw diameter, penetration depth, and concrete compressive strength. The capacity of the connections resulted from the numerical simulation were overestimates the manual calculation using EYM theory and NDS 2018 equations. The capacity of the connection increased about 146% to 284% due to the addition of secondary axial forces. In addition, this simulation can adequately predict the shear force, bending moment, and deformation of the screw. There is a plastic hinge formed in the screw after the screw being deformed a quite large. It shows the same yield mode with the manual calculation using EYM theory and NDS 2018 equations. This simulation also can show the contribution of each spring elements to resist the load until its ultimate strength.

Finite Element Analysis of Bi-directional Shear Panel Damper with Square Hollow Section under Monotonic Loading Ali Awaludin; Angga Fajar Setiawan; Iman Satyarno; Wu Shuanglan; Yusuf Haroki
Journal of the Civil Engineering Forum Vol. 8 No. 2 (May 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

This study aims to determine the finite element analysis of a BSPD-SHS (bi-directional shear panel damper with a square hollow section) device, to dissipate the seismic excitation energy through the lateral relative displacement between the pier and girder of the simple support bridge. The configuration of the square hollow section is also performed for a double role, such as web panel and flange, indicating the expectations to reduce the seismic force within the lateral and longitudinal directions. In the preliminary development phase, the finite element analysis was conducted under monotonic loading, to examine the skeleton curve characteristics and internal stress action on resisting seismic force. The characteristics of this curve include elastic stiffness, shear strength, post-yield behavior, and internal stress distributions. Based on the evaluation of the BSPD-SHS slenderness effect, the variation of depth-thickness ratio was considered between 25 to 67. To investigate the fitness of the theoretical shear strength formulation, two different hardening roles of the metal plasticity model were subsequently compared in this study, including the elastic-perfectly plastic and isotropic/kinematic techniques. Furthermore, the effect of the restrained degree of freedom idealization on the top base plate was captured. This indicated that all specimens model with the restrained top base plate achieved stable post-yield stiffness. In implementing the unrestrained top base plate, this stiffness was achieved when the web slenderness ratio equaled 25. The differences observed between the hardening roles also generated a slight yield shear strength discrepancy. However, significant differences occurred in the post-yield shear strength. The shear resistance proportion of the stress components was also accurately quantified with an analytical stress integration. Based on the restrained top base plate, the flange tension field generated a significant contribution to the post-yield shear resistance.

Structural Systems Comparison of Simply Supported PSC Box Girder Bridge Equipped with Elastomeric Rubber Bearing and Lead Rubber Bearing Alvin Kurniawan Santoso; Djoko Sulistyo; Ali Awaludin; Angga Fajar Setiawan; Iman Satyarno; Sidiq Purnomo; Ignatius Harry
Civil Engineering Dimension Vol. 24 No. 1 (2022): MARCH 2022
Publisher : Institute of Research and Community Outreach - Petra Christian University

This study compares the influence of elastomeric rubber bearing (ERB) as the regular bearing support and lead rubber bearing (LRB) as the seismic isolation device on the seismic performance of a seven-span simply supported prestressed concrete (PSC) box girder bridge, which was analyzed using nonlinear time history analysis (NLTHA) with the OpenSees software. The results showed that the maximum pier responses and damage were smaller in models with LRB than with ERB. The bridge model using ERB occurred the slightest damage at levels II, while the one using LRB was at levels I. In addition, the highest seismic performance level in the model with ERB was at the operational limit. Meanwhile, the seismic performance in the model with LRB was at the fully operational limit. Thus, LRB was a good preference for improving the seismic performance and mitigating the damage due to the seismic excitation with a slender pier.

Seismic Performance Comparison of Simply Supported Hollow Slab on Pile Group Structure with Different Operational Category and Shear Panel Damper Application Yusuf Haroki; Ali Awaludin; Henricus Priyosulistyo; Angga Fajar Setiawan; Iman Satyarno
Civil Engineering Dimension Vol. 25 No. 1 (2023): MARCH 2023
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.25.1.10-19

This study is aimed to compare the seismic performance of simply supported hollow slab on pile group (SHSPG) structures designed as “critical” and “essential” viaducts with shear panel damper (SPD) devices. There were three numerical models to be compared, namely SHSPG-A, SHSPG-B, and SHSPG-C. SHSPG-A is a “critical” viaduct with 35 piles per one pile head. SHSPG-B is an “essential” viaduct with 18 piles per one pile head. SHSPG-C is an “essential” viaduct with 18 piles per one pile head plus sixteen SPDs. Numerical models considered the prestressing effect of the spun pile. Nonlinear time history analyses were executed using seven pairs of recorded ground motions that had been scaled and adjusted to the seismic characteristics of Yogyakarta, Indonesia. As the result, the performance level of SHSPG-A was much better than SHSPG-B. The SPDs application could maintain SHSPG-C’s performance at the same level as SHSPG-A and dissipate 34.28%-53.03% of the seismic energy.

DESIGN PHASE OF A CYLINDRICAL LONG-SPAN COAL SHED WITH STEEL ARCH SPACE-TRUSS STRUCTURE Angga Fajar Setiawan; Akhmad Aminullah; Ali Awaludin; K. T. N. Gherry; Y. A. Adhitama; M. Fauzi Darmawan
Jurnal Riset Rekayasa Sipil Vol 5, No 2 (2022): Maret 2022
Publisher : Prodi Teknik Sipil Fakultas Teknik Universitas Sebelas Maret Surakarta

This paper discusses the structural design phase of a long-span coal shed structure in a 2x50 MW steam power plant. This study aims to share knowledge on how to design a long-span coal shed structure safely based on the design standards. The main structural system of the coal shed roof is a steel arch space-truss with 120 m of span and 31 m of height above supporting 12.5 m height of reinforced concrete columns. The superstructure contains a roof system and reinforced concrete system. The substructure system consists of a tie beam, pile cap, and bore pile. In the numerical model, all structural members were idealized as frame elements, except the pile cap that to be idealized as shell elements. Then, the soil springs were assigned to the bore pile element nodals with a 1 m interval to simulate the soil-structure interaction. The gravity loads due to dead loads, additional dead loads, live loads, rain loads, and lateral loads due to wind action and earthquakes to be considered. Furthermore, the structural analysis was conducted with non-linear geometric to simulate the large displacement effects and tension only element of the wind bracing. In addition, a simplified method to estimate the structural stability under lateral load was conducted. Based on the structural analysis and structural design, the coal shed structure could fulfill the safety criteria in terms of ultimate and serviceability limit based on the design code criteria. Furthermore, the non-linear geometry and stability issue should be considered with an appropriate structural analysis method.

Finite Element Analysis of Plastic Behavior in RC Beam Supports with Composite Steel Deck Slabs under Cyclic Loading Brihaspati Brihaspati; Ashar Saputra; Angga Fajar Setiawan; Djoko Sulistyo
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.34-45

The performance of beam supports is essential for seismic resilience, particularly under the Strong Column–Weak Beam (SCWB) principle. To improve construction efficiency, steel deck-based composite slabs are increasingly adopted as alternatives to conventional slabs. However, their impact on the plastic behavior of beam supports remains underexplored. This study evaluates the influence of steel deck slabs using finite element analysis in ABAQUS. Two beam-column joint models—conventional and modified—were subjected to cyclic loading according to FEMA 461. The models incorporated stiffness recovery, combined hardening for steel, and a cohesive zone model (CZM) for the concrete–steel deck interface. Results indicate that the steel deck model shows a wider hysteresis loop and 2.425% higher energy dissipation, but experiences earlier reinforcement yielding and greater stiffness degradation. Although ductility increases, plastic hinges form at nearly the same cycle. Overall, the steel deck system improves energy absorption and ductility but reduces elastic stiffness and accelerates inelastic behavior.

Assessment and Strengthening of Bolted Connections in the Mandomai Bowstring Bridge Constructed with Ulin Wood Shafira Khairunnisa Subchan; Ali Awaludin; Miqdad Khosyi Akbar; Radika Gandi Tama; Angga Fajar Setiawan; Angga Trisna Yudhistira; Inggar Septhia Irawati; Andreas Triwiyono
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.101-110

This study assessed and proposed a retrofit strategy for bolted timber connections in the Mandomai pedestrian bridge, constructed from Ulin wood (Eusideroxylon zwageri). Numerical modeling, analytical evaluation using Eurocode 5 yield equations, and experimental validation were conducted. Axial forces from a global Midas Civil model under a 1.25 kN/m² live load showed three critical connections (S11, S13, S14) with demand-capacity ratios (DCR) exceeding 1.0. A retrofit using steel side plates and ASTM A325 bolts reduced DCRs to 0.79, 1.02, and 0.70, respectively. Experimental testing of limited full-scale double-shear wood-to-wood joints demonstrated an average ultimate capacity of 191 kN, which was 57.65% higher than the theoretical prediction, indicating the conservative nature of Eurocode 5 and the contribution of mechanisms such as the rope effect and frictional interlock. The results confirmed the retrofit’s effectiveness and highlighted the need to refine design provisions for dense tropical hardwoods.

Experimental Study on the Hysteretic Behavior of Tempered Steel Helical Dampers Melania Anggita Harkristuti; Henricus Priyosulistyo; Angga Fajar Setiawan; Andika Monanta Emilidardi
Civil Engineering Dimension Vol. 28 No. 2 (2026): SEPTEMBER 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.2.264-275

Structural mitigation is a key strategy for reducing earthquake-induced property damage and casualties. Among various mitigation measures, dampers are widely used to enhance structural energy dissipation. This study proposes a heat-treated steel helical spring damper to improve damping performance. The dampers were fabricated from mild reinforcing steel bars with diameters of 6, 10, and 12 mm and different numbers of coils. An annealing process was applied to reduce the steel yield strength. The specimens were subjected to displacement-controlled sinusoidal cyclic loading to evaluate stiffness, strength, energy dissipation, and equivalent viscous damping ratio (EVDR). The results showed that reducing yield strength through annealing increased the EVDR by approximately 2.6%. Furthermore, larger coil diameters provided higher load-carrying capacity and greater energy dissipation. Conversely, increasing the number of coils reduced energy dissipation because of lower stiffness and larger yielding displacements within the applied loading range.

Co-Authors Ali Awaludin Ali Awaludin Ali Awaludin Ali Awaludin Ali Awaludin Alvin Kurniawan Santoso Aminullah, Akhmad Andika Monanta Emilidardi Andreas Triwiyono Angga Trisna Yudhistira Ashar Saputra Brihaspati Brihaspati Djoko Sulistyo Djoko Sulistyo Henricus Priyosulistyo, Henricus Ignatius Harry Iman Satyarno Iman Satyarno Iman Satyarno Inggar Septhia Irawati K. T. N. Gherry M. Fauzi Darmawan Melania Anggita Harkristuti Miqdad Khosyi Akbar Radika Gandi Tama Shafira Khairunnisa Subchan Sidiq Purnomo Urwatul Wusqo Wu Shuanglan Y. A. Adhitama Yusuf Haroki Yusuf Haroki

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