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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.
Assessment of traffic-induced low frequency sound radiated from a viaduct by field experiment
Kawatani, M.,Kim, C.W.,Nishitani, K. Techno-Press 2010 Interaction and multiscale mechanics Vol.3 No.4
This study is intended to assess low frequency sound radiated from a viaduct under normal traffic. The bridge comprises steel box girders and wide cantilever decks on which vehicles pass. The low frequency sound and the acceleration response of the bridge under normal traffic are measured to investigate how bridge vibrations affect the low frequency sound observed near the bridge. Observations demonstrate that strong relationships exist between frequency characteristic of bridge's acceleration response and the sound pressure level of low frequency sound. A noteworthy point is that the dynamic feature of the sound pressure level is mostly affected by dynamic feature of the span locating near the observation point.
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
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.
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.
Kim, C.W.,Kawatani, M.,Ozaki, R.,Makihata, N. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.4
This paper presents recovering of missing vibration data of a bridge transmitted from wireless sensors. Kalman filter algorithm is adopted to reconstruct the missing data analytically. Validity of the analytical approach is examined through a field experiment of a bridge. Observations demonstrate that, even a part of recovered acceleration responses is underestimated in comparison with those responses taken from cabled sensors, dominant frequencies taken from the reconstructed data are comparable with those from cabled sensors.
C.W. Kim,M. Kawatani,R. Ozaki,N. Makihata 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.4
This paper presents recovering of missing vibration data of a bridge transmitted from wireless sensors. Kalman filter algorithm is adopted to reconstruct the missing data analytically. Validity of the analytical approach is examined through a field experiment of a bridge. Observations demonstrate that, even a part of recovered acceleration responses is underestimated in comparison with those responses taken from cabled sensors, dominant frequencies taken from the reconstructed data are comparable with those from cabled sensors.
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.
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.