Jurnal Teknik Sipil

Enhancing Infrastructure Reliability Through Risk Identi-fication: A FMEA-based Failure Analysis in Indonesian Road Construction

2026-09-24T10:45:40+07:00

The high failure rate of infrastructure projects, especially road construction projects in Indonesia, has reached an alarming level. The failure often originate during the planning, tendering, supervision, and construction phases. Many infrastructure projects fail to meet engineering standards and contracts requirement, leading to functional failures, reduced service life, safety issues, inconvenience, and high maintenance and operating costs. This paper presents a failure analysis using the Failure Mode and Effect Analysis (FMEA) approach, which is based on root cause failure analysis to identify all potential failures and their impact on the reliability of infrastructure construction. The findings from this analysis can serve as a basis for decision making to improve construction quality, safety, and comfort while reducing maintenance and operation costs. The FMEA method has been successfully applied in the aviation industry to achieve a zero-accident program. The results of the study indicate that the main causes of construction failure are corrupt practices, incompetent planning consultants, and weak supervision. The results of FMEA, measured through the Risk Priority Number (RPN), allow project owners to identify components that need to be improved, prioritize changes, to increase infrastructure service life, safety, comfort, and infrastructure reliability according to the selected budget.

Keywords : FMEA, failure, infrastructure, risk analysis, reliability

Effect of D-Wall Penetration Depth on Hydraulic Stability in Deep Excavation for the Jakarta MRT Project under Different Excavation Scenarios

2026-02-09T11:06:43+07:00

Rapid urban growth has increased the need for underground space, often involving deep excavations in dense urban areas. Hydraulic stability becomes a key concern due to soft ground, high groundwater pressure, and nearby structures, factors that, if neglected, can cause excessive ground movement or failure. This paper examines how diaphragm wall (D-Wall) penetration depth affects three main hydraulic failure modes: basal heave, piping, and uplift. The study is based on a 22.4 m deep MRT station excavation in North-Central Jakarta area, surrounded by adjacent existing buildings. Finite element analyses were performed with CPTu-based soil parameters to evaluate safety factors under various embedment depths, wall stiffnesses, and excavation scenarios, including construction duration. The results show that the hydraulic stability for all failure modes increased with penetration depth ratio (Hp/He). A 1.0 m of wall thickness was found sufficient to ensure stability for a three-level excavation. Both predicted maximum deflection of approximately 44 mm and ground settlement of 40 mm remained within the serviceability limits. An empirical correlation between penetration depth and hydraulic stability is proposed for use in preliminary design. A minimum Hp/He of 1.65 is recommended to achieve overall hydraulic stability of the excavation with a minimum factor of safety of 1.5.

Keywords: Deep excavation, diaphragm wall, land Subsidence, wall deflection, stability, uplift.

ITB Golden Ratio Spillway Crest: An Innovative Spillway Geometry For Design Simplicity And Optimal Hydraulic Performance

2026-10-02T14:35:09+07:00

A spillway is a vital structure in dams or weirs, designed to safely discharge excess water when reservoir levels exceed operational limits. Its performance depends greatly on crest geometry. In Indonesia, the Ogee and cylindrical spillways are the most commonly used. The Ogee spillway is recognized for its superior hydraulic efficiency and ability to maintain low-pressure profiles; however, it requires complex geometry and high construction precision. Conversely, the cylindrical spillway is easier to construct but lacks consistent design standards, particularly for defining the crest radius, which may complicate in design and construction. To address the need for a practical yet theoretically sound alternative, the ITB Golden Ratio Spillway was introduced. This design applies the mathematical golden ratio (ϕ ≈ 1.618) to the crest geometry, aiming to achieve hydraulic performance comparable to traditional Ogee crest spillways while simplifying design and construction. The result is a spillway geometrical structure that combines visual simplicity with engineering functionality. The performance of the ITB Golden Ratio Spillway—types a and b—was evaluated using numerical simulations with Flow-3D, and the results were validated through hydraulic physical model tests. The Golden Ratio Spillway delivers comparable flow capacity to ogee and cylindrical spillway. This makes the ITB Golden Ratio Spillway a compelling and innovative alternative, offering simplicity in field application and optimal hydraulic performance.

Keywords : Golden ratio, spillway, spillway capacity, spillway design curve.

Evaluasi Numerik Kapasitas Geser Profil Baja Sayap Lebar: Konsiderasi Ragam Kegagalan dan Pengaruh Kelengkungan Pelat Badan

2026-06-30T14:40:22+07:00

Shear capacity of wide-flange steel beams with low height-to-thickness web ratio, is calculated assuming the shear capacity is unaffected by web buckling and section imperfections. Previous studies show that web curvature within tolerance limits, can significantly reduce the beam's shear capacity. In this study, the failure modes and the impact of web curvature on shear behavior are evaluated numerically using ABAQUS software. Various wide-flange sections, with nominal shear capacity determined by the web shear yielding, are modelled and analyzed. Each section is analyzed in perfect condition and with web curvature at maximum deviation at the tolerance limits of JIS 3192:2008. The results show web buckling determines the shear capacity of several beams with perfect sections by up to 4,3% of the nominal capacities. The impact of web curvature on shear behavior shifts the failure mode from yielding to web buckling and reduces the shear capacity up to 14,6% compared to the shear capacity of the perfect section. Recommendation for shear design parameters based on the numerical evaluation include a post-buckling shear strength reduction factor, C_v1, of 0,95 and a shear resistance factor, ϕ_v, of 0,90, with maximum imperfection limit of web curvature to be taken as d/150 or t_w/4.

Keywords : Numerical analysis, shear buckling, shear capacity, web curvature, wide-flage section.

1D Numerical Scheme of Dambreak Flows Over Moveable Bed Using FTCS Scheme

2026-01-20T16:59:31+07:00

This paper will try to simulate the modeling of sediment transport phenomena. We use a Numerical scheme for the classical Saint-Venant – Exner model. It is based on a relaxation approach and works with all sediment flux functions. The governing equation will be divided into Hydrodynamic and Morphodynamic. Morphodynamics will be using the classical Exner approach and Hydrodynamic will be using FTCS numeric scheme. This paper will validate the simulation with the previous research. From the simulation results, it can be seen that a simple numeric method such as FTCS is capable of simulating scour due to dam break flow. Several conditions must be considered to carry out this simulation, namely the purchase of the Courant Number value.

Kata-kata Kunci : Dambreak, FTCS, morphodynamic.