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| Residual displacements of RC piers under action of earthquake |
| WANG Jun-wen1, LI Hai-yang2, YAN Ju-kao3，SHI Yan4 |
1. MOE Key Lab of Roads and Railway Engineering Safety Control, Shijiazhuang Tiedao University, Shijiazhuang 050043, China；
2. CITIC General Institute of Architectural Design and Research Co., Ltd. , Wuhan 430014, China；
3. Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, China；
4. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract To understand deeply the relationship between residual displacement and maximum displacement of reinforced concrete (RC) piers under action of earthquake, a more accurate estimation method for residual displacement was proposed. Firstly, using the fiber beam-column element in the seismic response simulation software OpenSees, a dynamic analysis model for RC piers was established, its reliability was verified through comparing the results computed using this model with those of the existing RC piers’ shaking table tests. Secondly, the effect laws of various parameters including piers’ axial compression ratio, aspect ratio, longitudinal reinforcement ratio, transverse reinforcement ratio, strength hardening coefficient of longitudinal reinforcement and ratio of longitudinal reinforcement yield strength to concrete compression strength on the ductility index of RC pier top’s residual displacement were analyzed. Finally, the prediction formula for the residual displacement influence coefficient with variation of these parameters was obtained with the regression analysis. The rationality of this formula was verified using the existing RC piers’ shaking table test data. The study results showed that compared with the Japanese specification, RC piers’ residual displacements estimated with the proposed formula are closer to test data; the proposed formula can be used to preliminary estimate RC piers’ residual displacements under action of earthquake when performing aseismic designs based on performances.
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Received: 23 February 2017
Published: 28 June 2018
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