Chung-Yue Wang

Chung-Yue Wang
National Central University | NCU · Department of Civil Engineering

PhD

About

111
Publications
19,697
Reads
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949
Citations
Introduction
NDT, structure health monitoring, fluid-structure interaction, motion analysis of discrete deformable blocks, underwater inspection of structure, bridge engineering, railway mechanics
Additional affiliations
August 1990 - present
National Central University
Position
  • Professor
Description
  • main research interests are Bridge Engineering, Impact dynamics, Mechanics of Composite Material, Granular Material and Deformable Multi-body System, NDT, Structural Health Monitoring, Motion Analysis of Structures.
August 1989 - July 1990
University of Illinois, Urbana-Champaign
Position
  • PostDoc Position
Education
August 1984 - May 1989
University of Texas at Austin
Field of study
  • Engineering Mechanics

Publications

Publications (111)
Chapter
Lacking substructure information usually challenges bridge agencies when evaluating the flood or earthquake resistance of bridges in disaster-prone areas. Appropriate substructure inspection techniques are essential for bridge engineers to develop repair strategies efficiently and reasonably allocate maintenance funds. In this article, the electric...
Article
Concrete exposed to cyclic wetting and drying in salty water conditions is thought to be subjected to an accelerated ingress of chloride from the outside environment, and prone to a worsening deterioration process inside. Additionally, there is an osmotic effect on salty water flow in porous concrete. However, so far, a fully profound understanding...
Article
A two-phase ultrasonic velocity tomography technique was introduced to inspect the concrete quality of bridge pylons in Taiwan. In phase I, the modified cross-hole sonic logging method was applied to rapidly identify the aberrant sections of pylon shafts and horizontal beams. Most of the concrete quality was classified as good (G), ie the apparent...
Article
Full-text available
Developing an appropriate and efficient inspection pattern for an unknown bridge substructure is a critical issue for bridge engineers, contractors, and bridge agencies. This paper introduces a two-phase near-surface inspection strategy to determine the foundation depth of fully submerged pile bents of an existing bridge. Electrical resistivity tom...
Article
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Structure failure often occurs in the joint. This failure can adversely affect the comfort level of the structure. Knowing the behavior of interior beam-column joint structure resulting from the load is important, as it can help to predict the strength of the structure interior beam-column joint and comfort of the structure being worked on. One way...
Conference Paper
Full-text available
Flexural Wave Impulse Response Evaluation of Pile Bent Foundations
Article
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In this paper, a foundation inspection strategy was developed to determine the condition on a fully-submerged pile bent foundation supporting an overwater vehicular bridge in Taiwan. The electrical resistivity tomography inspection displayed the overall conditions of the salt-content canal. Using the reciprocal principle-based ultra-seismic inspect...
Article
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The velocity tomography inspection, including modified cross-hole sonic logging and ultrasonic velocity tomography methods, was introduced to detect the reinforced concrete pylons of a pedestrian suspension bridge in northern Taiwan. At the first stage, the modified cross-hole sonic logging method was employed to rapidly identify the positions of g...
Chapter
Full-text available
The guided wave theory has been introduced to determine the usable frequency range to reliably use the well-known one-dimensional wave theory to interpret impulse response testing results in pile foundations. Length-to-diameter ratio is usually considered a key factor to affect the analysis results. In this research, thirty-seven testing cases with...
Chapter
Full-text available
A flexural wave impulse response approach is particularly applicable in the nondestructive evaluation of foundations of overwater structures, such as bridge piers or wharves, that lack access to their tops. The experimental procedure of the flexural wave impulse response method is similar to that of the traditional (longitudinal wave) impulse respo...
Conference Paper
In this paper, the wavelet spectral finite element (WSFE) method is applied for studying the phenomenon of elastic wave propagating in a cracked beam structure. It is an inverse problem for identifying the location and depth of cracks in beams. The transient-state longitudinal and transverse waves are generated in an extended Euler-Bernoulli beam....
Conference Paper
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The conventional impulse response and ultra-seismic inspection techniques are commonly used to the integrity testing in concrete piles. The identification of anomaly position is one of the most critical issues in such non-destructive evaluation. A joint ultra-seismic inspection and impulse response experiment is developed on a traction-free detecte...
Conference Paper
The vertical profiling ultra-seismic inspection is introduced to inspect model concrete piles under the traction-free and partially embedded conditions. Such a lateral impact inspection method is commonly used for inaccessible substructure tops, like pile bents. A frequency-based analysis based on the guided wave theory and resonance concept is dev...
Article
The hydrodynamic loadings on underwater pipelines are essential parameters for pipeline design. This study integrates a Large Eddy Simulation (LES) model and the Volume of Fluid (VOF) method to examine the interaction between free surface flows and a horizontally-mounted circular cylinder. The simulated water depths and surface pressures on the cyl...
Article
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Energy dissipation mechamism is the key to study tsunami hazand mitigation. Numerical method is adopted to study the interaction between bores and square cylinders. The model solves the three-dimensional Navier–Stokes equations with Large-Eddy Simulation turbulence model. The Volume-of-fluid (VOF) method is used to track the complex free surface. W...
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The purpose of this paper is to present a three-dimensional constitutive model based on the concept of equivalent uniaxial strain. closed Menetrey-Willam (CMW) failure surfaces which combined with Menetrey-Willam meridian and the cap model are introduced in this paper. Saenz stress-strain model is applied and adjusted by the ultimate strength param...
Article
Concrete is a composite material composed mainly of water, sand, aggregate, and cement. The characteristics of high attenuation of concrete for ultrasound degrade the performance of ultrasonic testing (UT), especially when the size of the target is much smaller than the aggregate. Thanks to recent improvements in electronic devices and computing te...
Article
A computationally efficient method is proposed for analyzing train and bridge dynamic interaction responses based on the vector form intrinsic finite-element method. The proposed method does not need to establish a large number of complicated dynamic coupling equations for the train and bridge, in contrast to the traditional finite-element method....
Article
This paper presents a new approach to simulate the propagation of elastic and cohesive cracks under mode-I loading based on the vector form intrinsic finite element method. The proposed approach can handle crack propagation without requiring global stiffness matrices and extra weak stiffness elements. The structure is simulated by mass particles wh...
Conference Paper
In this paper, several measurement instruments, including thermal fiber Bragg grating (FBG) sensor, strain gauge, non-contact displacement measurement technique, and GPS, have been applied to the case when a titling train Puyouma moved through the Tai’an Viaduct in Taiwan. Using measured information, consisting of vibrations on train, rail, and bri...
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This study integrates a large eddy simulation model to investigate the effect of a submerged rectangular cylinder on the hydro-dynamics of free surface flows. The simulation results are validated by the results of flume experiments. Then the numerical model is utilized to examine the influences of Reynolds number, Froude number, and blockage ratio...
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A probabilistic approach is used to create a preliminary inspection evaluation form (PIEF) for scour potential at bridge sites. In Taiwan, the risk of pier scour is often evaluated using a two-step procedure. First, a bridge is visually inspected based on a PIEF. An advanced scour risk analysis is conducted for a bridge with a high PIEF score. Beca...
Article
Regularity visual inspections are performed on steel wire ropes of suspension bridges. However, because the steel wire ropes were coated with plastic materials, inspectors could not visually detect the deterioration conditions of the ropes. In this paper, radiation tests and electromagnetic testing were compared. The gamma rays used in the radiatio...
Article
In civil engineering, imaging can be a useful non-destructive testing (NDT) tool for revealing defects in a concrete structure. To date, there is no effective method for imaging the defects inside in situ concrete structures. In this study, a new elastic wave-based NDT method has been developed and then applied to reveal the defects inside concrete...
Article
Full-text available
With the advantages of easy coding and effortless mathematic-compiling, genetic algorithm (GA) is a popular optimization solver of artificial intelligence. However, converging to the local optimum may be a general problem of it. In order to overcome this drawback, a hybrid optimization algorithm integrating local model of particle swarm optimizatio...
Article
This paper discusses the feasibility of detecting defects inside reinforced concrete (RC) structures by using multi-directional Synthetic Aperture Focusing Technique (SAFT) to create an image which contains the comprehensive information about the geometry of possible defects. This is achieved by scanning the structure in multiple directions and pro...
Conference Paper
Inspection, monitoring and analysis techniques are the core techniques required for the performance evaluation and maintenance of railway system. Accelerometers, velocity meters, thermal couples, strain gauge, LVDT, optical FBG sensors and digital camera have been used to acquire the perform data of viaduct, track, train and power cable of railway...
Article
Using elastic-wave-based NDT methods to detect defects in RC structures is difficult because of the interference of rebars. In this study, the interference effect on the quality of SAFT images was quantitatively explored using a series of numerical simulations. Furthermore, two concrete specimens were fabricated for experimental verification. The e...
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Full-text available
Non-destructive testing (NDT) inspection has been verified to efficiently know the current conditioning of bridge foundations. In this paper, NDT techniques were required to inspect the unknown foundations on a damaged heritage railroad bridge for further rehabilitation in Taiwan. Three proposed NDT methods, electrical resistivity tomography, ultra...
Article
This paper develops the point-by-point impact vibration method, a damage diagnosis method for beam structures. The theoretical development and experimental verification were carried out on aluminum beams with single and double cracks in the vertical direction and on pre-stressed concrete beams with local breaks. The processing signals were the time...
Article
In this study, a nondestructive testing method based on stress waves, the impact echo method, was applied to inspect the current thickness of a refractory wall inside a blast furnace. Blast furnaces are high-productivity structures that are prone to internal erosion hazards that majorly affect the lifespan of the blast furnace. Previous studies hav...
Article
This study developed a novel two-way dynamic coupled numerical model to simulate moving solids in free surface flows. The fluid flows and hydrodynamic pressures are simulated by a Large Eddy Simulation model, and the free surface is tracked by the Volume-of-Fluid (VOF) method. The fluid response from the solid motion is modeled through specifying t...
Article
Full-text available
In this paper, analytical simulations of the steel-laminated elastomeric bearing (SLEB) using a three-dimensional (3D) finite element model incorporating material, geometric nonlinearities, and a frictional contact algorithm in LS-DYNA code is conducted. In order to simulate the nonlinear responses of the elastomeric bearing under the compression a...
Conference Paper
To overcome the difficulty of integrating continuous/discontinuous numerical methods to a software and retain its flexibility at the same time, National Center for Research on Earthquake Engineering (NCREE) under National Applied Research Laboratories (NARL) in Taiwan has designed a Versatile Engineering Simulation ENvironment (named VESEN), which...
Article
Full-text available
It is important to simulate the entire-process collapse of earthquake excited cable-stayed bridge in order to assure the damage extent under strong earthquakes and to optimize the anti-collapse seismic measures. The newly developed vector form intrinsic finite element (VFIFE) method is capable of computing large deformation, large displacement, col...
Article
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The exposure of pier foundations owing to scour significantly reduces the foundation-bearing capacity and diminishes the flood-resistant capacity of a bridge. This paper proposes a nonlinear quasi-static analysis procedure for the performance of bridges with pile foundations under flow-induced loads for the evaluation on the flood-resistant capacit...
Article
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The failure of the Shuang-Yuan Bridge in Taiwan caused by floods associated with Typhoon Morakot in August 2009 prompted this forensic investigation into its causes. The investigation found multiple factors for the bridge failure: (1) flood flows, (2) river-bend-induced skewed flow, and (3) the effects induced by extended foundation caps and rafted...
Article
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In Taiwan, many bridges span rivers that exhibit severe channel variations in response to drastically increased flows and resulting floods caused by typhoons and storms. Flood-induced scour can undermine the effective embedment depth of bridge foundations. The Shuang-Yuan Bridge, spanning a downstream section of the Kaoping Stream, was severely dam...
Article
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With the development of high-density intercity railway networks, substantial investments are now required, in terms of labor and machinery, in order to be able to conduct safety inspections. This results in high operational costs. High-capacity and high-speed operations have resulted in levels of damage and deterioration of railway system component...
Conference Paper
Full-text available
Non-destructive testing (NDT) has been verified to efficiently know foundation conditioning. In this paper, NDT techniques were required to inspect the bridge foundations with high scour potential in Taiwan. The electrical resistivity tomography was proposed to conduct to the inspection on three commonly-used foundation types of bridges. This techn...
Article
In this paper, a set of the procedures of the numerical simulation for the buried pipeline is proposed. These numerical procedures are used to compute the large deformations of the buried pipeline through the fault. In order to simulate the fault slip, displacement control is adopted. The geometric and material nonlinearity of buried pipe are consi...
Article
In this paper, the nonlinear analysis of the motion structures is studied by using the vector form intrinsic finite element (VFIFE, V-5) method. The main object of this research is to develop an internal hinge of two ends of the plane frame element. In this study, the hinge function of frame element is used to compute the nonlinear dynamic response...
Article
In this study, wind tunnel experiments and a Large Eddy Simulation (LES) model were used to investigate the protective effect of porous windbreak on road vehicles against crosswind. The model prediction of the side force and lift coefficients compared favorably with the wind tunnel experiments of vehicles on the ground. The simulation results of th...
Conference Paper
Scour is the number one cause of bridge failure in many areas. A better procedure on scour potential evaluation and inspection technique plays an important role to avoid or mitigate possession and life loss. In this paper, a proposed scour inspection procedure is developed as a five-phase routine each inspection cycle in Taiwan. Those phases clearl...
Conference Paper
Full-text available
Local scour is the major problem causing bridge failures in Taiwan. In this paper, the proposed three-dimensional (3-D) numerical fluid-solid coupled scour model is based on the development of the Bingham rheological theory coupled with volume-of-fluid model. The validated model is applied to simulate the Shuang-Yuan Bridge failure by Typhoon Morak...
Article
The requirements for inspection and management of track irregularity have to be more rigorous due to safety and serviceability concerns as the increment of the train speed of high-speed train. The wavelength of track irregularity significantly affects running safety and riding comfort. To improve inspection, operation, efficiency, and address, the...
Conference Paper
Full-text available
Bridges in Taiwan confront scour challenge induced by typhoons and storms. Based on economic consideration, a two-phase assessment process on the safety of bridge scour is proposed and served as a rapid/inexpensive inspection of scour potential first and a detailed quantitative evaluation later. An in-situ visual inspection obtains its rating of sc...
Article
An upgraded piezoelectric film type real-time scour monitoring sensor installed along the bridge pier is presented. The core idea of developing this scouring sensing system is based on the physical characteristic that output voltage can be generated as the piezoelectric film is deformed by the flowing media. Therefore, a sensing device can be const...
Article
This paper presents a new approach of health monitor using the curvature of the influence line. The study included numerical simulation and experimental test of H-beam to demonstrate the effectiveness of the new approach. The specific work includes: loading test method for moving vehicular to measure displacement influence line of beam structure, o...
Conference Paper
Full-text available
Approximate 200 highway bridges in Taiwan are damaged in Typhoon Morakot event in August, 2009. The flood-induced multiple natural hazards, such as flood, landslide, debris flow, drafting wood, and barrier lakes, cause embankment erosion, discharge loss, overflow accompanying with debris, vibratory river bending, etc. around bridges. Identifying di...
Article
This paper discusses the application of position-sensitive detector (PSD) technology to a real bridge for the purpose of health monitoring. The PSD system consists of two parts: the assembly of PSD targets with mounted LEDs for emitting light spots, and the PSD light-spot capturer for tracking the sensing lights. To verify the performance and relia...
Article
There were 13 standard spans of variant span length and pier height tested at early stage of Taiwan High Speed Railway's operation. The test was aimed to verify the actual dynamic responses meeting the design code, and to establish the initial values of bridge structure dynamic behaviors. In this test, triaxial accelerometers and triaxial velocimet...
Article
This paper presents an experimental study of a new assessment of track irregularity based on a new inverse analysis method. Two tri-axial accelerometers are mounted on the axel box of a track recording vehicle to measure the dynamic response. And according to the acceleration responses at axel box, the spatial path of the moving wheel on the track...
Article
Full-text available
In this paper, we present a two-way coupled moving solid algorithm with discrete element method (DEM) to simulate dynamic fluid-solid interaction. This model allows obstacles moving in the multi-phase fluids to generate realistic motion for both the fluids and obstacles. We discretize the Navier- Stokes equation using finite volume method (FVM) for...
Article
To install the continuous welded rail (CWR) on the viaduct, it is necessary to consider the accumulated axial force owing to temperature difference and the additional force of the rail exerted by the track-bridge expansion as a result of temperature difference, the so-called track-bridge interaction. This paper used A-thermal fiber bragg grating (F...
Conference Paper
Full-text available
Typhoon Morakot severely damaged approximate 200 highway bridges in Taiwan in August, 2009. The induced multiple natural hazards, such as flood, landslide, debris flow, drafting wood, and barrier lakes, caused embankment erosion, discharge loss, overflow accompanying with debris, vibratory stream bending, etc. around bridges. Both traditional and i...
Article
The main object of this paper is to apply the vector form intrinsic finite element (VFIFE, or V-5) techniques in nonlinear large deformation dynamic analysis for the responses of moving loads on rigid frame structures. In this study, the simulation of moving loading is brought into the vector form intrinsic finite element method. It can effectively...
Article
A useful nondestructive testing tool for civil engineering should immediately reveal defects inside concrete structures at the construction sites. To date, there are few effective methods to image defects inside concrete structures. In this paper, a new nondestructive testing method using elastic waves for imaging possible defects inside concrete i...
Conference Paper
Full-text available
The upstream and downstream Shuang-Yuan Bridges were swept away from piers P2 through P13 and piers P2 through P15, respectively, during Typhoon Morakot. This paper addresses the process, results, and interpretation of resistivity image tomography (RIT) for finding underwater remnant foundations. The RIT technique conduced provides the positions an...
Conference Paper
Full-text available
Typhoon Morakot and its successively-induced southwest air current brought a heavy precipitation more than 2,500 mm in southern Taiwan and caused serious slope failures, numerous debris flows, and over 200-year recurrence flood during August 8 to 11, 2009. More than 100 highway bridges were severely broken and swept away due to multiple natural haz...
Conference Paper
Full-text available
Typhoon Morakot was the deadliest typhoon to impact Taiwan in recorded history during August 7-10, 2009. This typhoon wrought catastrophic damage in Taiwan, leaving 461 people dead and 192 others missing, most of who are feared dead and roughly NT$ 110 billion ($3.3 billion USD) in damages. The storm produced copious amounts of rainfall, peaking at...
Article
The current bridge visual inspection system in Taiwan was introduced in this paper. According to the collected visual inspected information, a further analysis was adopted to propose a criterion for prioritization of bridge maintenance. A bridge is composed of 20 components which are evaluated with DERU method. For each damaged component, correspon...
Article
Due to complex material and nonuniform characteristics of reinforced concrete members, practical obstacles exist when conducting nondestructive testing for determination of the position of holes in concrete. This paper discusses how to use gamma- rays to penetrate concrete and project images of internal structures and holes/discontinuities on film....
Article
The objective of this paper is to present the results of research for evaluating the installed lengths of soil nails with nondestructive testing methods. Two closely related methods, the sonic echo test and the impulse response test, both of which had been widely applied to assess the integrity of drilled shafts and driven piles, were evaluated to...
Article
This paper develops a finite element code to simulate the nonlinear hysteretic behaviors of reinforced concrete frames containing different types of brick wall panel under cyclic excitation. Two‐dimensional solid finite elements are used to model the concrete, clay brick and mortar materials and truss elements are used to model the steel reinforcem...
Article
Full-text available
Non-destructive testing (NDT) is used extensively in structural forensic engi-neering to evaluate the quality of reinforced concrete. Identifying imperfections or the location of steel in highly non-uniform concrete is rather difficult simply because the examination results cannot achieve the desired precision. NDT remains inad-equate in numerous s...