TY - GEN
T1 - Large-scale dual shake tables testing
T2 - 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
AU - Cheung, Moe M.S.
AU - Yang, Cheng Yu
AU - Pan, Yuxin
AU - Xiong, Feng
PY - 2013
Y1 - 2013
N2 - The traditional approach for seismic analysis is based on a uniformexcitation assumption, which works well for normal buildings, but is not quite accurate for long span structures, such as bridges, dams, and pipe network systems. For long span bridges, different supports might be subjected to significantly different seismic excitations, foundation types, soil conditions, seismic inputs, with different incidence angles. In general, four main factors may contribute to the spatial variation of earthquake excitations: A) incoherence effect, b) attenuation effect, c) site effect and d) propagation effect. During the last 30 years, many researchers have been working on the numerical analysis of seismic behavior of long span bridges under uniform or non-uniform ground motion; however, few experimental studies of large scale bridge models subjected to earthquake loading have been carried out. Although there are many shake tables in universities and research institutes all over the world, few have a multiple shake table system which can provide non-uniform excitations to different parts of the structural model. A dual shake table testing system has been developed at the Hong Kong University of Science and Technology and a 1:120 reduced scale model of a cable-stayed bridge with a main span of 430m is designed and constructed for the purpose of this study. This paper describes the factors involved in the scale factor selection and the detailed design processes of different components of the model, including towers, girders, stayed-cables aswell as artificial masses.The earthquake records from theSMART-1, aswell as the PEER Strong Motion Database, are used in the shake table test. The results of the modal tests, the identical-input excitation tests and the varying-input excitation tests are presented, for the purpose of a) evaluating the design of the reduced scale model and the experimental method, b) studying the dynamic performance of long span bridges, and c) improving understanding of the response of long span bridges subjected to spatially varying earthquake ground motion.
AB - The traditional approach for seismic analysis is based on a uniformexcitation assumption, which works well for normal buildings, but is not quite accurate for long span structures, such as bridges, dams, and pipe network systems. For long span bridges, different supports might be subjected to significantly different seismic excitations, foundation types, soil conditions, seismic inputs, with different incidence angles. In general, four main factors may contribute to the spatial variation of earthquake excitations: A) incoherence effect, b) attenuation effect, c) site effect and d) propagation effect. During the last 30 years, many researchers have been working on the numerical analysis of seismic behavior of long span bridges under uniform or non-uniform ground motion; however, few experimental studies of large scale bridge models subjected to earthquake loading have been carried out. Although there are many shake tables in universities and research institutes all over the world, few have a multiple shake table system which can provide non-uniform excitations to different parts of the structural model. A dual shake table testing system has been developed at the Hong Kong University of Science and Technology and a 1:120 reduced scale model of a cable-stayed bridge with a main span of 430m is designed and constructed for the purpose of this study. This paper describes the factors involved in the scale factor selection and the detailed design processes of different components of the model, including towers, girders, stayed-cables aswell as artificial masses.The earthquake records from theSMART-1, aswell as the PEER Strong Motion Database, are used in the shake table test. The results of the modal tests, the identical-input excitation tests and the varying-input excitation tests are presented, for the purpose of a) evaluating the design of the reduced scale model and the experimental method, b) studying the dynamic performance of long span bridges, and c) improving understanding of the response of long span bridges subjected to spatially varying earthquake ground motion.
UR - https://www.scopus.com/pages/publications/84889055760
M3 - Conference Paper published in a book
AN - SCOPUS:84889055760
SN - 9781138000612
T3 - Research and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
SP - 271
EP - 276
BT - Research and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
Y2 - 2 September 2013 through 4 September 2013
ER -
