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All Journal Journal of Advanced Civil and Environmental Engineering Acitya Wisesa: Journal of Multidisciplinary Research Jurnal Spesialis Teknik Sipil (JSpTS)
Buntara Sthenly Gan
Nihon University
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Environmental Science Physics Transportation

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Isogeometric Analysis of Euler-Bernoulli Beam Element Buntara Sthenly Gan
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 1, No 2 (2018): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.1.2.57-70

Abstract

Abstract: The Isogeometric analysis is a computational geometry based on a series of polynomial functions (Non-Uniform Rational B-Spline, NURBS) which are assembled to represent the exact geometry. In the Isogeometric analysis, the curvature geometry of the beam element can be represented exactly. The conventional beam element can be developed by using the Isogeometric approach which is based on Euler-Bernoulli principle which is under the assumption that the dimension of the beam cross section is small compared with the length of the beam. The geometric shape of the beam and the shape functions formulation of the element can be formulated by using the Isogeometric approach. This paper highlights the application of the NURBS for the Euler-Bernoulli beam element in the context of finite element analysis. Examples are given to verify the effectiveness of the Isogeometric approach in static and free vibration problems.
Vibrational analysis of Levy-type plates by using SEM Shota Kiryu; Buntara Sthenly Gan
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 1, No 1 (2018): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.1.1.18-29

Abstract

The use of the frequency-dependent spectral method in structural dynamic related problems is known to provide very accurate solutions while reducing the number of degree-of-freedom to resolve the computational and cost drawbacks. This paper investigated the vibrational characteristics of a rigid pavement road which is modeled by an isotropic Levy-type rectangular thin plates. The Spectral Element Method (SEM) in the frequency domain is developed to formulate the free vibration problems of the plate. Transcendental stiffness matrices are well established in vibration, derived from the exact analytical solutions of the differential equations of a plate element. The present spectral element model has four line-type degree-of-freedoms (DOF) on each edge of the Levy-type rectangular plate. Natural frequencies are found using the Wittrick-Williams algorithm. Numerical examples are given to show the effectiveness, efficiency, and accuracy of the SEM by using one element, unlike the FEM, the SEM gives exact solutions of the natural frequencies of plates without element discretization procedures.
Vibration of Tensegrity Stucture by using SEM Buntara Sthenly Gan; Shota Kiryu
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 2, No 2 (2019): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.2.2.53-58

Abstract

A tensegrity structure is a structure which consists both of compressive and tensile elements without being restrained at the boundaries. The self-equilibrium state inside the tensegrity structure is the condition that builds the structure without any boundary condition necessity. The conventional Eigensystem solver cannot deal with this kind of structure since there are rigid body motions in the governing equations. The exact dynamic solution of tensegrity structure problems can only be obtained by using the frequency-dependent dynamic method. In this study, the free vibrational characteristics of a tensegrity structure which is modeled by a combination of the compressive strut and tensile cables elements are solved by using the Spectral Element Method (SEM). Natural frequencies of the tensegrity are tracked by using the Wittrick-Williams algorithm. Numerical calculations are given to show the effectiveness, efficiency, and accuracy of the SEM in solving the axially vibrating members of the tensegrity structures.
Kinerja dan Kapasitas Struktur Bangunan Eksisting sesuai Prinsip Evaluasi ASCE 41-17 Shinta Berlinda Wulandari; Hanie Teki Tjendani; Buntara Sthenly Gan
Jurnal Spesialis Teknik Sipil (JSpTS) Vol. 7 No. 1 (2026)
Publisher : Magister Teknik Sipil, Fakultas Teknik, Universitas 17 Agustus 1945 Surabaya

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Abstract

Indonesia is located in a highly active seismic region due to its position along the Pacific Ring of Fire, causing many existing buildings to remain vulnerable to earthquake loads, particularly structures designed using outdated seismic codes. This study aims to evaluate the performance and structural capacity of an existing reinforced concrete building based on the performance-based evaluation principles of ASCE 41-17 integrated with SNI 1726:2019 and SNI 2847:2019. The research employed a quantitative analytical method using numerical simulation through Tier 1 – Screening Procedure and Tier 3 – Systematic Procedure. Structural performance evaluation was conducted using nonlinear static pushover analysis to determine capacity curves, plastic hinge formation, drift behavior, and structural performance levels. The results indicate that the existing structure still contains several structural deficiencies, particularly in columns and lateral force-resisting systems. The pushover analysis shows that the structure is still capable of resisting moderate earthquake demands; however, its capacity and ductility decrease significantly under higher seismic intensity. The structure does not fully satisfy the Immediate Occupancy (IO) and Life Safety (LS) performance levels, although under certain conditions it still achieves Collapse Prevention (CP). Plastic hinge distribution concentrated in column elements indicates that the strong column–weak beam mechanism has not been achieved optimally, making columns the critical elements controlling global structural stability. Overall, the ASCE 41-17 performance-based evaluation approach proves effective in assessing the seismic performance and capacity of existing buildings and can serve as a basis for determining structural strengthening or retrofit requirements.
Perhitungan Biaya Perkuatan Struktur Bangunan Hotel Eksisting Berdasarkan SNI 1726:2012 Menggunakan Carbon Fiber Reinforced Polymer (CFRP) Aviska Triayaska; Hanie Teki Tjendani; Buntara Sthenly Gan
Jurnal Spesialis Teknik Sipil (JSpTS) Vol. 7 No. 1 (2026)
Publisher : Magister Teknik Sipil, Fakultas Teknik, Universitas 17 Agustus 1945 Surabaya

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Abstract

The change in earthquake standards from SNI 1726:2012 to SNI 1726:2019 has increased earthquake load demands in several regions in Indonesia, including Surabaya City, so an evaluation of the safety of existing buildings is needed. This study aims to calculate the cost of strengthening the structure of an existing hotel building using the Carbon Fiber Reinforced Polymer (CFRP) method due to increased earthquake loads based on the latest standards. The object of the study is a 10-story hotel building designed using SNI 1726:2012. Structural analysis was carried out using SAP2000 V.26.3.0 with the pushover analysis method based on ASCE 41-17 to determine structural elements that require rehabilitation. Elements that experience performance exceeding the Collapse Prevention (CP) limit are planned to use CFRP reinforcement according to ACI 440.2R-17 guidelines. Furthermore, the calculation of the work volume and the Cost Budget Plan (RAB) was carried out based on the unit price of work in Surabaya City. The results of the study indicate that the B6-1 Beam element (150 mm × 400 mm) on several floors requires CFRP reinforcement with a total work volume of 28.35 m2. Based on the results of the cost analysis, the unit price of the work is Rp. 2,389,987.46/m2 with a total rehabilitation cost of Rp. 67,756,144.46. The use of CFRP is considered effective in increasing the capacity and ductility of the structure without significantly increasing the building mass, although it has a relatively high initial cost compared to conventional methods.
Critical Chain Project Management for Hospital Reconstruction: Cost and Time Optimization Berlinda Alveria Agusta; Hanie Teki Tjendani; Buntara Sthenly Gan
Acitya Wisesa: Journal of Multidisciplinary Research Vol. 5 Issue 2 (2026)
Publisher : jfpublisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56943/jmr.v5i2.970

Abstract

Construction project delays represent a persistent challenge in Indonesian infrastructure development, with delay rates reaching 38% and causing substantial cost overruns and quality compromises. This research evaluated the application of Critical Chain Project Management methodology to optimize cost and time performance in the Undata Hospital Phase II-B Rehabilitation and Reconstruction Project in Palu, Central Sulawesi, which experienced significant delays from 240 contracted days to 426 actual implementation days. Using Microsoft Project for critical chain identification and Root Square Error Method for buffer calculation, the study analyzed 228 structural work activities to determine schedule optimization potential. Results identified nine critical chain activities concentrated in foundation work, requiring 60-day project buffer and 36-day feeding buffer allocation. CCPM application achieved 159-day duration reduction (43.1% improvement) compared to actual implementation, reducing total duration from 369 days to 210 days. Economic analysis revealed potential labour cost savings of IDR 7,398,931,383.36 (59.0% reduction) through elimination of embedded safety time and strategic buffer placement. Comparative evaluation demonstrated that traditional scheduling dispersed 183 days of safety time across individual activities, manifesting as work expansion through Parkinson's Law effects. Even under partial buffer consumption scenarios, CCPM maintained substantial performance advantages, confirming methodology robustness. These findings support CCPM adoption for Indonesian reconstruction projects requiring complex coordination, extended durations, and strategic schedule management under international funding frameworks.
Co-Authors Aviska Triayaska Berlinda Alveria Agusta Hanie Teki Tjendani Shinta Berlinda Wulandari Shota Kiryu Shota Kiryu