A New Hybrid Input Strategy to Reproduce Across-Fault Ground Motions on Multi-Shaking Tables
Source abstract
Abstract
Abstract Extended engineering structures such as bridges, tunnels, and pipelines are vulnerable to surface fault ruptures, and thus large-scale tests using multi-shaking tables are necessary to investigate the structural performance in this special scenario. Because of the properties of the conventional displacement-controlled shaking table system with proportional-integral-derivative controllers, acceleration and displacement input strategies have respective drawbacks when used to reproduce across-fault ground motions. This study presents a new hybrid input strategy to reproduce across-fault ground motions on multi-shaking tables, which overcomes the limitations of traditional acceleration or displacement input. In particular, the new input strategy aims to match both low-frequency displacements and high-frequency accelerations. The proposed hybrid input strategy was validated by the previously performed shaking table tests of a steel-concrete composite rigid-frame bridge under the across-fault ground motions. For comparison, conventional acceleration and displacement input strategies were also used in the tests to excite the bridge model. Test results including the reproduced ground motions and the structural responses obtained by the three input strategies are presented and compared. The test results indicate that the proposed hybrid input strategy can reproduce across-fault ground motions with improved fidelity on conventional multi-shaking tables. This study can provide useful references for the shaking table tests of bridge, tunnel and pipeline structures with the consideration of crossing fault-rupture zones.
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Research context
OpenAlex topics: Geotechnical Engineering and Underground Structures · Seismic Performance and Analysis · Structural Response to Dynamic Loads
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Southeast University 1 , 2 Southeast University Rd., Nanjing, Jiangsu 211189 ,
State Key Laboratory of Bridge Structural Dynamics, China Merchants Chongqing Communications Research & Design Institute Co., Ltd. 2 , 33 Xuefu Dadao, Chongqing 400067 ,
School of Civil Engineering, Southeast University 3 , 2 Southeast University Rd., Nanjing, Jiangsu 211189 ,
Shenzhen Municipal Design & Research Institute Co., Ltd. 4 , 3007 Sungang Xilu, Shenzhen, Guangdong 518029 ,
Funding
National Natural Science Foundation of China · Postgraduate Research & Practice Innovation Program of Jiangsu Province · Fundamental Research Funds for the Central Universities · China Scholarship Council · National Key Research and Development Program of China
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