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Tran, Quang Huy,Huh, Jungwon,Nguyen, Van Bac,Haldar, Achintya,Kang, Choonghyun,Hwang, Kyeong Min Hindawi Limited 2018 Advances in civil engineering Vol.2018 No.-
<P>Ship-to-shore (STS) container gantry cranes, used at terminals for loading and unloading containers from a ship, are an important part of harbor structures. The size and weight of modern STS container cranes are increasing to satisfy the demand for bigger ships. This is expected to result in more lateral load when excited by seismic motions. The existing Korean STS container cranes did not behave properly during several recent moderate earthquakes in South Korea. Typical Korean STS container cranes must be checked for the earthquake-resistant capacity. In this research, two nonlinear static analyses procedures, also known as pushover analyses, commonly used for seismic design of buildings, namely, capacity spectrum method and equivalent linearization method, are comprehensively studied to check their suitability for studying seismic behavior of STS cranes. Results obtained by these two nonlinear static analysis methods are then compared with the results obtained by nonlinear time-history analyses of the STS cranes by exciting them with nine recorded earthquake time histories around worldwide. The behaviors of the cranes are analyzed in terms of the total base shear, drift, and base uplift. The comparisons indicate that the nonlinear static methods can be appropriate for estimating the total base shear and drift of the portal frame of a container crane. The pushover analyses also provide information on performance levels as defined in ASCE/SEI 41-13, of a typical Korean STS container crane. Furthermore, it is observed that the uplift response of the crane is strongly influenced by the duration of an earthquake.</P>
Tomographic density imaging using modifi ed DF–DBIM approach
Tran Quang Huy,Nguyen Thi Cuc,Van Dung Nguyen,Ton That Long,Tran Duc Tan 대한의용생체공학회 2019 Biomedical Engineering Letters (BMEL) Vol.9 No.4
Ultrasonic computed tomography based on back scattering theory is the most powerful and accurate tool in ultrasound basedimaging approaches because it is capable of providing quantitative information about the imaged target and detects verysmall targets. The duple-frequency distorted Born iterative method (DF–DBIM), which uses density information along withsound contrast for imaging, is a promising approach for imaging targets at the level of biological tissues. With two frequenciesf 1 (low) and f 2 (high) through 1and 2iterations respectively, this method is used to estimate target density along withsound contrast. The implications of duple-frequency fusion for the image reconstruction quality of density information alongwith sound contrast based ultrasound tomography have been analyzed in this paper. In this paper, we concentrate on theselection of parameters that is supposed to be the best to improve the reconstruction quality of ultrasound tomography. Whenthere are restraints imposed on simulated scenarios to have control of the computational cost, the iteration number 1isdetermined resulting in giving the best performance. The DF–DBIM is only eff ective if there are a moderate number of iterations,transmitters and receivers. In case that the number of transducers is either too large or too small, a result of reconstructionwhich is better than that of the single frequency approach is not produced by the implementation of DF–DBIM. A fi xedsum of 1and 2was given, the investigation of simulation results shows that the best value of 1is[2− 1]. Theerror, when applying this way of choosing the parameters, will be normalized with the reduction of 56.11%, compared touse single frequency as used in the conventional DBIM method. The target density along with sound contrast is used to imagetargets in this paper. It is a fact that low-frequency off ers fi ne convergence, and high-frequency off ers fi ne spatial resolution. Wherefore, this technique can eff ectively expand DBIM’s applicability to the problem of biological tissue reconstruction. Thanks to the usage of empirical data, this work will be further developed prior to its application in reality.
Tran, Quang Huy,Huh, Jungwon,Mac, Van Ha,Kang, Choonghyun,Han, Dongyeob Elsevier 2018 NDT & E international Vol.100 No.-
<P><B>Abstract</B></P> <P>The ability to predict critical conditions on highway concrete bridges is important for the avoidance of unpredictable collapses during the operation period. Potential deteriorations can develop, such as terms of cracks, air voids, and subsurface delaminated areas that are usually detected through nondestructive testing (NDT) techniques together with conventional sounding methods, i.e. hammer sounding and chain dragging. Of these deteriorations, delamination is one of the major indicators of concrete bridge health, i.e., the measurement of the percentage of delaminated area. Due to vehicle loading, changes in weather and environment, and corrosion of reinforcing steel bars, delamination can occur above or even below the rebar layer, and it can be difficult to identify and determine the size and depth of delamination, especially for delamination below the rebars. In this study, two concrete specimens were analyzed in the laboratory as used with a wide range of different concrete covers that are commonly applied in bridge structures, from 2 to 8 cm at near surface. Square Pulse Thermography (SPT), one of the active infrared thermography (IRT) techniques, is used to analyze the specimens in terms of their various heating regimes and environmental conditions. This study aims to comprehensively investigate the effect of steel reinforcement on the detectability of delamination when the delaminations have a width-to-depth ratio equal to or smaller than 2.0. The results show that delamination above the rebars indicates a higher absolute contrast than that below the rebars. In addition, the observation time of delamination below the rebars decreases significantly. As a result, the predicted depth of a delamination will be less than the value of the real depth.</P>
다양한 주변 온도에서의 펄스 스퀘어 서모그래피를 이용한 콘크리트 비파괴 검사
트란쾅휘 ( Tran Quang Huy ),강충현 ( Kang Choonghyun ),허정원 ( Huh Jungwon ),한동엽 ( Han Dongyeob ),고광일 ( Koh Kwang-il ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
This research aim to investigate the qualitative and quantitative performance of concrete deteriorations using Pulse Square Thermography (PST) technique. An experimental test of ten cases was conducted on a concrete slab specimen under different meteorological conditions. The results showed that the absolute contrast between defective area and sound area decreases with the falling of ambient temperature. Besides, the delamination with identical size but placed at a deeper position indicates lower absolute contrast than the shallow delamination.