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| Endurance Time Analysis of the Bridges with Unbonded Prestressed Piers |
| DU Xiao-lei1, GE Hua2 |
1. Zhejiang Provincial Institute of Communications Planning, Design and Research, Hangzhou Zhejiang 310006, China;
2. PowerChina Sichuan Electric Power Engineering Co., Ltd, Chengdu Sichuan 610041, China |
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Abstract The endurance time method (ETM) is a novel dynamic seismic analysis, which employs intensified artificial earthquakes as the input. This method can ensure both the structural dynamic effect and computation efficiency when conducting the seismic evaluation of complex structural systems. Based on these advantages, this study investigated the applicability of ETM in the self-centering bridges incorporating prestressed concrete-filled steel tube (CFST) piers. A 3D finite element model of a typical four span continuous-beam bridge which adopted prestressed CFST piers was established by OpenSees software. Compared with the incremental dynamic analysis (IDA) results, the feasibility of ETM to predict the seismic response of self-centering bridges was validated. Also, the effect of prestressing force in piers on the seismic performance of self-centering bridge systems was studied by ETM. Numerical results show that ETM can be used in the seismic evaluation of bridges with prestressed self-centering piers. The seismic response, such as PT force and residual displacement, can be well predicted by using this method. In addition, the influence of prestressing force on the seismic response of bridges is related to the type of bearings and the intensity of earthquakes. For the superstructure, the displacement of main deck can be reduced by increasing prestressing force, but the shear force of fixed bearings increases accordingly. For the substructure, the piers with sliding bearings are less influenced by prestressing force, while seismic internal force of fixed piers increases with the occurrence of prestressing force. Therefore, it is necessary to comprehensively consider the structural system arrangement and seismic basic intensity of site during the seismic design of such bridges.
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Received: 08 May 2021
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[1] AASHTO-2015, Guide Specification for LRFD Seismic Bridge Design[S].
[2] CJJ 166-2011, Code for Seismic Design of Urban Bridges[S]. (in Chinese)
[3] JTG/T B02-01-2008, Guidelines for Seismic Design of Highway Bridges[S]. (in Chinese)
[4] DU X L, ZHOU Y L, HAN Q, et al. Shaking Table Tests of a Single-Span Freestanding Rocking Bridge for Seismic Resilience and Isolation[J]. Advances in Structural Engineering, 2019, 22(15):3222-3233.
[5] DU Xiu-li, ZHOU Yu-long, HAN Qiang, et al. State-of-the-art on Rocking Piers[J]. Earthquake Engineering and Engineering Dynamics, 2018, 38(5):1-11. (in Chinese)
[6] LI Jian-zhong, GUAN Zhong-guo. Research Progress on Bridge Seismic Design:Target from Seismic Alleviation to Post-earthquake Structural Resilience[J]. China Journal of Highway and Transport, 2017, 30(12):1-9. (in Chinese)
[7] LIU X, LI J, TSANG H H, et al. Experimental Evaluation of Seismic Performance of Unbonded Prestressed Reinforced Concrete Column[J]. Engineering Structures, 2019, 208:109913.
[8] ZHANG Yu-ye. Research Progress of Methods for Improving Seismic Performance of Prefabricated Bridge Piers[J]. Journal of Highway and Transportation Research and Development, 2017, 34(4):72-79. (in Chinese)
[9] NAKAKI S D, STANTON J F, SRITHARAN S. An Overview of the PRESSS Five-Story Precast Test Building[J]. PCI Journal, 1999, 44(2):26-39.[ZK)]
[10] SAKAI J, MAHIN S A. Analytical Investigations of New Methods for Reducing Residual Displacements of Reinforced Concrete Bridge Columns, PEER 2004/02[R]. San Francisco:Pacific Earthquake Engineering Research Center, 2004.
[11] SAKAI J, JEONG H, MAHIN S. Reinforced Concrete Bridge Columns That Re-center Following Earthquakes[C]//Proceedings of the 8th U. S. National Conference on Earthquake Engineering. San Francisco:Curran Associates, Inc., 2006.
[12] CHANDARA K, CHANG-SU S, SUNG-JUN P. Seismic Performance of Prefabricated Bridge Columns with Combination of Continuous Mild Reinforcements and Partially Unbonded Tendons[J]. Smart Structures and Systems, 2016, 17(4):541-557.
[13] SUN Z, WANG D, BI K, et al. Experimental and Numerical Investigations on the Seismic Behavior of Bridge Piers with Vertical Unbonded Prestressing Strands[J]. Bulletin of Earthquake Engineering, 2016, 14:501-527.
[14] LIU Xiao-xian. Study on Self-centering Capacity of Unbonded Prestressed Reinforced Concrete Bridge Columns Subjected to Earthquake Ground Motions[D]. Shanghai:Tongji University, 2018. (in Chinese)
[15] HAN Lin-hai. Concrete Filled Steel Tubular Structures:Theory and Practice[M]. 3rd ed. Beijing:Science Press, 2016. (in Chinese)
[16] HUANG Yu-fan, WU Qing-xiong, YUAN Hui-hui, et al. Analysis on Running Safety on Lightweight Bridge with CFST Composite Truss Girder and Lattice Piers under Earthquakes[J]. Journal of Highway and Transportation Research and Development, 2018, 35(11):77-86. (in Chinese)
[17] LI Ning, ZHANG Shuang-cheng, LI Zhong-xian, et al. Deformation Analysis Model and Validation for Precast Segmental Concrete Filled Steel Tube Self-centering Bridge Column[J]. Engineering Mechanics, 2020, 37(4):135-143. (in Chinese)
[18] LI C, HAO H, BI K. Seismic Performance of Precast Concrete-filled Circular Tube Segmental Column under Biaxial Lateral Cyclic Loadings[J]. Bulletin of Earthquake Engineering, 2019, 17:271-296.
[19] ESTEKANCHI H E, MASHAYEKHI M, VIFAI H, et al. A State-of-knowledge Review on the Endurance Time Method[J]. Structures, 2020, 27:2288-2299.
[20] BAI Jiu-lin, OU Jin-ping. Seismic Performance Evaluation of Reinforced Concrete Frame Structures Using the Endurance Time Method[J]. Engineering Mechanics, 2016, 33(10):86-96. (in Chinese)
[21] XU Qiang, XU Shu-tong, CHEN Jian-yun, et al. Failure Probability Density Evolution Analysis of Gravity Dam Based on ETA Method[J]. Advanced Engineering Sciences, 2019, 51(2):28-37. (in Chinese)
[22] SHEN Yu, TAN Hua-shun, WANG Xian-zhi, et al. Application of the Endurance Time Method to Seismic-induced Pounding Analysis for Long-span Extradosed Cable-stayed Bridges Considering Wave Passage Effects[J]. Engineering Mechanics, 2020, 37(3):131-141, 148. (in Chinese)
[23] GUO A, SHEN Y, BAI J, et al. Application of the Endurance Time Method to the Seismic Analysis and Evaluation of Highway Bridges Considering Pounding Effects[J]. Engineering Structures, 2017, 131:220-230.
[24] HAO Chao-wei, CHEN Yan-jiang, HE Hao-xiang, et al. The Endurance Time Method in the Seismic Analysis of the Continual Rigid-bridge with High Piers[J]. Journal of Disaster Prevention and Mitigation Engineering, 2017, 37(2):215-221. (in Chinese)
[25] HE H, WEI K, ZHANG J, et al. Application of Endurance Time Method to Seismic Fragility Evaluation of Highway Bridges Considering Scour Effect[J]. Soil Dynamics and Earthquake Engineering, 2020, 136:106243.
[26] WAN Shang-hui. Research on Seismic Performance of Prestressed Concrete-filled Steel Tubular Self-centering Columns[D]. Shanghai:Tongji University, 2017. (in Chinese)
[27] GB/T 20065-2006, Screw-thread Steel Bars for the Prestressing of Concrete[S]. 2021, (10)82-91C4842
[28] VAMVATSIKOS D, CORNELL C A. Applied Incremental Dynamic Analysis[J]. Earthquake Spectra, 2004, 20(2):523-553. |
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2021, Vol. 15 
