Nghia Nguyen

• Ho Chi Minh City Open University

Ho Chi Minh City, a major economic hub in Southeast Asia, has witnessed significant growth, with numerous infrastructure projects demanding a thorough understanding of the underlying soil characteristics. However, unlike the extensively studied Bangkok clay, the critical state parameters of Ho Chi Minh clay have not been rigorously explored, despit...

This study focuses on the 2D and 3D nonlinear seismic damage analysis of a proposed concrete gravity dam using the finite element program ABAQUS, employing the concrete damaged plasticity model. To compare the 2D and 3D analyses, four different cases of the dam's spillway section are simulated. Initially, a frequency analysis is performed to estima...

The influence of the initial improvement through prefabricated vertical drains (PVD) and surcharge embankment on the second improvement by vacuum PVD has not been comprehensively explored in the existing literature. The expansion of the Second Bangkok International Airport (Suvarnabhumi Airport) underwent initial treatment with PVD and surcharge, f...

Purpose Concrete gravity dams are important structures for flood control and hydraulic power generation, but they can be vulnerable to seismic activity due to ground movements that trigger crack propagation. Design/methodology/approach To better understand the factors that affect the stability of concrete gravity dams against concrete fracture dur...

The utilization of a mechanically stabilized earth wall (MSE wall) is prevalent due to its stability and cost-effectiveness compared to conventional earthwork construction methods. In addition, the railway transportation infrastructure has played a vital role in connecting Thailand’s numerous regions. The behavior of a 6-m-high MSE wall constructed...

Determining the load-bearing capacity of piles currently relies on various field experimental methods, with static pile compression loading testing and dynamic pile testing through Pile Driving Analysis (PDA) being widely accepted as reliable practices. However, the application of PDA tests faces limitations, especially in construction projects wit...

The global widespread adoption of Prefabricated Vertical Drains (PVD) in conjunction with vacuum consolidation is driven by its robust and cost-efficient attributes. However, this construction method is not without challenges, as it has been linked to substantial displacements, posing risks to adjacent structures. Addressing such concerns in a Viet...

Soils consisting of porous particles, such as pumice sands and calcareous sands, exhibit unique characteristics due to the presence of intraparticle voids. Although significant impacts of intraparticle voids on mechanical behavior, such as reduced single-particle crushing strength and shear modulus in pumice sands, have been reported, quantifying t...

Structural health monitoring (SHM) and Non-destructive Damage Identification (NDI) using responses of structures under dynamic excitation have an imperative role in the engineering application to make the structures safe. Interpretations of structural responses known as inverse problems are emerging topics with a large body of works in the literatu...

The static bending behavior of porous functionally graded (PFG) micro-plate under the geometrically nonlinear analysis is studied in this article. A small-scale nonlinear solution is established using the Von-Kármán hypothesis and the modified couple stress theory (MCST). To obtain the deflection of the plate, the Reddy higher-order plate theory co...

An experimental program was directed to the evaluation of the strength of soil (ball clay)-cement, and soil (soft clay)-cement samples with different curing conditions; tap water, lime-saturated water, plastic wrapping, and open ambient air at 28 days. The compression, and the scanning electron microscopy results were used to describe the effect of...

This paper addresses the issue of the latest analytical method when tackling a vacuum consolidation problem in a ground improvement project using prefabricated vertical drains (PVD) and the necessity of using numerical simulation. This paper aims to introduce a matching scheme to derive appropriate soil and drain properties in analytical solution a...

This study presents a simple, efficient, accurate method for nonlinear time-history earthquake analysis of spatial steel frames. The proposed new fiber plastic hinge method simulating only one element for each member captures the time-history dynamic behavior of steel frames as accurately as sophisticated plastic zone methods. Stability functions a...

In this paper, new analytical formulations, which can be easily applied to normal and high-strength concretes under monotonic compressive and direct tensile loads, are proposed. Moreover, plastic damage model for concrete under uniaxial cyclic loading is also employed by introducing a simple damage function. The majority of published material model...

Currently, the vertical drain consolidation problem is solved by numerous analytical solutions, such as time-dependent solutions and linear or parabolic radial drainage in the smear zone, and no artificial intelligence (AI) approach has been applied. Thus, in this study, a new hybrid model based on deep neural networks (DNNs), particle swarm optimi...

Ground improvement with the prefabricated vertical drain (PVD) has become widely employed for soft ground treatment because of its economical and efficient method. While numerous numerical and analytical methods have been derived for PVD however, it is still an extensively high demand for a simpler and more accurate method for design steps. This pa...

Many structural analysis problems in civil engineering and mechanical engineering can be treated as plane stress and plane strain problems introduced in the theory of elasticity. One of the popular analytical methods to tackle plane analysis is to determine Airy stress function. In general, the Airy stress function depends on the analyzed domain an...

This paper presents the reduction phenomenon of the added damping in a stay cable caused by static wind loads acting on a cable with an external damper. First, an equation of motion of a sagging cable is derived that takes the consideration of dead loads including cable self-weight and static wind loads into account. Second, a finite difference for...

This paper presents a solution for partially penetrated prefabricated vertical drains (PVD) with less computational time and more accuracy than previous analytical solutions. A new impermeable boundary region at drain's end is introduced to simplify boundary conditions and reduce the number of variables. Moreover, the Laplace transform technique is...

Prefabricated vertical drains (PVDs) with the surcharge preloading and vacuum consolidation has become considerably popular for ground improvement projects. A simple solution that incorporates the fundamental embankment features, such as the average degree of consolidation and excess pore pressure, are essential for the design of soft ground improv...

This study aims to present a three-dimensional (3D) numerical solution for investigating the free vibration and buckling responses of annular plate, conical and cylindrical shell made of functionally graded (FG) porous rock materials. Isogeometric analysis (IGA) is utilized in order to develop the 3D numerical solution. Furthermore, the computation...

Previous investigators have found increasing rates odf consolidation with increasing degrees of soft clay improvement using PVD only, Vacuum-PVD, Thermo-PVD and Thermo-Vacuum-PVD). This paper utilized scanning electron microscope (SEM) to evaluate and compare the microstructures of the clay specimens obtained from within the smear zone of both undi...

The manuscript shows a second-order inelastic analysis procedure for steel framed structures under static and seismic forces. Nonlinear inelastic finite element formulations are established utilized Stability Functions (SF) solved from exact solutions of second-order differential equations of beam-column finite element subjected to moments and axia...

This paper presents an effective method for crack identification to improve the training of Artificial Neural Networks (ANN) parameters using Jaya algorithm. Dynamic and static datasets are introduced using eXtended IsoGeometric Analysis (XIGA) to improve the accuracy of the proposed application based on the frequency and strain measurements. Based...

The manuscript shows an advanced analysis software of steel frames under static loadings. Input and output processes are programed using C++ and FORTRAN. A visual graphic interface for the advanced analysis software is coded for modeling easily and showing the result performance of analyzing structures. The proposed software uses stability function...

Purpose This paper aims to present a new discrete method to predict average excess pore pressure and degree of consolidation for soft ground using prefabricated vertical drains under time-dependent surcharge and/or vacuum loading and multi-soil layers. Design/methodology/approach The drain is discretized into a number of mesh points at which the a...

Partially penetrated prefabricated vertical drains (PVDs) have been analyzed by many methods, including analytical methods, semi-analytical methods and finite element methods (FEM). The recent methods have considered the drain’s end as a permeable region while most of the current construction techniques use an anchor plate element at the end of a P...