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Assessment of Traffic-induced Low Frequency Noise Radiated from Steel Box Girder Bridge
Mitsuo Kawatani,김철우,Naoki Kawada,Shohei Koga 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
This study intends to investigate traffic-induced low frequency noises radiated from a seven span continuous steel box girder bridge which adopts steel decks and steel piers integrated with the superstructure rigidly. The low frequency sound pressure level (SPL) is estimated by means of the boundary element method (BEM) using velocity responses of the bridge. The velocity response is estimated from a three dimensional bridge-vehicle interactive analysis. The influence of the sound wave reflected by ground is also considered in the analysis using the image method. Observations demonstrate that the vehicle moving on the outer lane (slow traffic lane) gives higher SPL than running on inner lane (passing lane) because of the torsional effect. Increasing the number of vehicles increases SPL as expected
Computer simulation for dynamic wheel loads of heavy vehicles
Kawatani, Mitsuo,Kim, Chul-Woo Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.4
The characteristics of dynamic wheel loads of heavy vehicles running on bridge and rigid surface are investigated by using three-dimensional analytical model. The simulated dynamic wheel loads of vehicles are compared with the experimental results carried out by Road-Vehicles Research Institute of Netherlands Organization for Applied Scientific Research (TNO) to verify the validity of the analytical model. Also another comparison of the analytical result with the experimental one for Umeda Entrance Bridge of Hanshin Expressway in Osaka, Japan, is presented in this study. The agreement between the analytical and experimental results is satisfactory and encouraging the use of the analytical model in practice. Parametric study shows that the dynamic increment factor (DIF) of the bridge and RMS values of dynamic wheel loads are fluctuated according to vehicle speeds and vehicle types as well as roadway roughness conditions. Moreover, there exist strong dominant frequency resemblance between bounce motion of vehicle and bridge response as well as those relations between RMS values of dynamic wheel loads and dynamic increment factor (DIF) of bridges.
He, Xingwen,Kawatani, Mitsuo,Hayashikawa, Toshiro,Kim, Chul-Woo,Catbas, F. Necati,Furuta, Hitoshi Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.5
In this study, a damage detection approach using train-induced vibration response of the bridge is proposed, utilizing only direct structural analysis by means of introducing soft computing methods. In this approach, the possible damage patterns of the bridge are assumed according to theoretical and empirical considerations at first. Then, the running train-induced dynamic response of the bridge under a certain damage pattern is calculated employing a developed train-bridge interaction analysis program. When the calculated result is most identical to the recorded response, this damage pattern will be the solution. However, owing to the huge number of possible damage patterns, it is extremely time-consuming to calculate the bridge responses of all the cases and thus difficult to identify the exact solution quickly. Therefore, the soft computing methods are introduced to quickly solve the problem in this approach. The basic concept and process of the proposed approach are presented in this paper, and its feasibility is numerically investigated using two different train models and a simple girder bridge model.
Xingwen He,Mitsuo Kawatani,Toshiro Hayashikawa,Chul-Woo Kim,F. Necati Catbas,Hitoshi Furuta 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.5
In this study, a damage detection approach using train-induced vibration response of the bridge is proposed, utilizing only direct structural analysis by means of introducing soft computing methods. In this approach, the possible damage patterns of the bridge are assumed according to theoretical and empirical considerations at first. Then, the running train-induced dynamic response of the bridge under a certain damage pattern is calculated employing a developed train-bridge interaction analysis program. When the calculated result is most identical to the recorded response, this damage pattern will be the solution. However, owing to the huge number of possible damage patterns, it is extremely time-consuming to calculate the bridge responses of all the cases and thus difficult to identify the exact solution quickly. Therefore, the soft computing methods are introduced to quickly solve the problem in this approach. The basic concept and process of the proposed approach are presented in this paper, and its feasibility is numerically investigated using two different train models and a simple girder bridge model.
Seismic response of a monorail bridge incorporating train-bridge interaction
Kim, Chul-Woo,Kawatani, Mitsuo,Lee, Chang-Hun,Nishimura, Nobuo Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.2
Dynamic responses of the bridge for a straddle-type monorail subjected to the ground motion of high probability to occur are investigated by means of a three-dimensional traffic-induced vibration analysis to clarify the effect of a train's dynamic system on seismic responses of a monorail bridge. A 15DOFs model is assumed for a car in the monorail train. The validity of developed equations of motion for a monorail train-bridge interaction system is verified by comparison with the field-test data. The inertia effect due to a ground motion is combined with the monorail train-bridge interaction system to investigate the seismic response of the monorail bridge under a moving train. An interesting result is that the dynamic system of the train on monorail bridges can act as a damper during earthquakes. The observation of numerical results also points out that the damper effect due to the dynamic system of the monorail train tends to decrease with increasing speed of the train.
Linear system parameter as an indicator for structural diagnosis of short span bridges
Kim, Chul-Woo,Isemoto, Ryo,Sugiura, Kunitomo,Kawatani, Mitsuo Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.11 No.1
This paper intended to investigate the feasibility of bridge health monitoring using a linear system parameter of a time series model identified from traffic-induced vibrations of bridges through a laboratory moving vehicle experiment on scaled model bridges. This study considered the system parameter of the bridge-vehicle interactive system rather than modal ones because signals obtained under a moving vehicle are not the responses of the bridge itself but those of the interactive system. To overcome the shortcomings of modal parameter-based bridge diagnosis using a time series model, this study considered coefficients of Autoregressive model (AR coefficients) as an early indicator of anomaly of bridges. This study also investigated sensitivity of AR coefficients in detecting anomaly of bridges. Observations demonstrated effectiveness of using AR coefficients as an early indicator for anomaly of bridges.
Linear system parameter as an indicator for structural diagnosis of short span bridges
김철우,Ryo Isemoto,Kunitomo Sugiura,Mitsuo Kawatani 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.11 No.1
This paper intended to investigate the feasibility of bridge health monitoring using a linear system parameter of a time series model identified from traffic-induced vibrations of bridges through a laboratory moving vehicle experiment on scaled model bridges. This study considered the system parameter of the bridge-vehicle interactive system rather than modal ones because signals obtained under a moving vehicle are not the responses of the bridge itself but those of the interactive system. To overcome the shortcomings of modal parameter-based bridge diagnosis using a time series model, this study considered coefficients of Autoregressive model (AR coefficients) as an early indicator of anomaly of bridges. This study also investigated sensitivity of AR coefficients in detecting anomaly of bridges. Observations demonstrated effectiveness of using AR coefficients as an early indicator for anomaly of bridges.
삼차원 해석에 의한 강합성교 바닥판의 교통유발진동 응답 평가
김철우,카와타니 미츠오,이우현,Kim, Chul Woo,Kawatani, Mitsuo,Lee, Woo Hyun 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.2
최근 교량상 주행 차량의 중량화 및 대형화 그리고 교통량의 증대로 교량의 바닥판 등의 피로 손상이 문제화되고 있다. 이러한 손상의 주 요인은 교량의 노면 및 신축 이음부의 단차 위를 주행하는 차량의 동적 접지력으로 볼 수 있다. 이에 대해 바닥판의 거동을 적절하게 해석 할 수 있는 삼차원 동적 응답 해석이 필요하게 되었다. 따라서 본 연구에서는 삼차원 차량 및 교량 모델을 구축하여 바닥판의 동적 응답 및 차량의 동적 접지력을 계산하고, 신축 이음부에 개재된 단차의 영향에 따른 바닥판의 응답을 평가 해보았다. 해석치는 일본 오오사카의 판신(Hanshin)고속도로 매전(Umeda) 입로교에서 수행한 실측치와 비교하였다. Recently, it is frequently reported that fatigue damages of deck slabs and floor systems of highway bridges occur under the conditions of increasing weight and traffic of heavy vehicles. These troubles are affected by dynamic wheel load of heavy vehicles running on roadway surface roughness with bump at expansion joint. It is required that this kind of traffic-induced vibration of highway bridges must be analyzed by using three-dimensional models of bridge and vehicle. In this study, the three-dimensional dynamic analysis is carried out, and dynamic responses of deck slab and wheel loads of moving vehicle are estimated according to different vehicle speeds and bump heights. Analytical responses of bridge deck slab are compared with experimental ones which were measured at Umeda entrance bridge of Hanshin Expressway in Osaka.