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Reduction of train-induced vibrations on adjacent buildings
Hung, Hsiao-Hui,Kuo, Jenny,Yang, Yeong-Bin Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.11 No.5
In this paper, the procedure for deriving an infinite element that is compatible with the quadrilateral Q8 element is first summarized. Enhanced by a self mesh-expansion procedure for generating the impedance matrices of different frequencies for the region extending to infinity, the infinite element is used to simulate the far field of the soil-structure system. The structure considered here is of the box type and the soils are either homogeneous or resting on a bedrock. Using the finite/infinite element approach, a parametric study is conducted to investigate the effect of open and in-filled trenches in reducing the structural vibration caused by a train passing nearby, which is simulated as a harmonic line load. The key parameters that dominate the performance of wave barriers in reducing the structural vibrations are identified. The results presented herein serve as a useful guideline for the design of open and in-filled trenches concerning wave reduction.
Sliding and rocking response of rigid blocks due to horizontal excitations
Yang, Yeong-Bin,Hung, Hsiao-Hui,He, Meng-Ju Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.1
To study the dynamic response of a rigid block standing unrestrained on a rigid foundation which shakes horizontally, four modes of motion can be identified, i.e., rest, slide, rock, and slide and rock. The occurrence of each of these four modes and the transition between any two modes depend on the parametric values specified, the initial conditions, and the magnitude of ground acceleration. In this paper, a general two-dimensional theory is presented for dealing with the various modes of a free-standing rigid block, considering in particular the impact occurring during the rocking motion. Through selection of proper values for the system parameters, the occurrence of each of the four modes and the transition between different modes are demonstrated in the numerical examples.
Yi-Tsung Chiu,Tzu-Kang Lin,Hsiao-Hui Hung,Kuo-Chun Chang,Yu-Chi Sung 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
The widening project on Freeway No.1 in Taiwan has a total length of roughly 14 kilometers,and includes three special bridges, namely a 216 m long-span bridge crossing the original freeway, an F-bentdouble decked bridge in a co-constructed section, and a steel and prestressed concrete composite bridge. This study employed in-situ monitoring in conjunction with numerical modeling to establish a real-timemonitoring system for the three bridges. In order to determine the initial static and dynamic behavior of thereal bridges, forced vibration experiments, in-situ static load experiments, and dynamic load experimentswere first carried out on the newly-constructed bridges before they went into use. Structural models of thebridges were then established using the finite element method, and in-situ vehicle load weight, arrangement,and speed were taken into consideration when performing comparisons employing data obtained fromexperimental measurements. The results showed consistency between the analytical simulations andexperimental data. After determining a bridge's initial state, the proposed in-situ monitoring system, which isemployed in conjunction with the established finite element model, can be utilized to assess the safety of abridge's members, providing useful reference information to bridge management agencies.
Chiu, Yi-Tsung,Lin, Tzu-Kang,Hung, Hsiao-Hui,Sung, Yu-Chi,Chang, Kuo-Chun Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
The widening project on Freeway No.1 in Taiwan has a total length of roughly 14 kilometers, and includes three special bridges, namely a 216 m long-span bridge crossing the original freeway, an F-bent double decked bridge in a co-constructed section, and a steel and prestressed concrete composite bridge. This study employed in-situ monitoring in conjunction with numerical modeling to establish a real-time monitoring system for the three bridges. In order to determine the initial static and dynamic behavior of the real bridges, forced vibration experiments, in-situ static load experiments, and dynamic load experiments were first carried out on the newly-constructed bridges before they went into use. Structural models of the bridges were then established using the finite element method, and in-situ vehicle load weight, arrangement, and speed were taken into consideration when performing comparisons employing data obtained from experimental measurements. The results showed consistency between the analytical simulations and experimental data. After determining a bridge's initial state, the proposed in-situ monitoring system, which is employed in conjunction with the established finite element model, can be utilized to assess the safety of a bridge's members, providing useful reference information to bridge management agencies.