Residual displacement of RC bridge piers with vertical unbonded prestressing strands
SI Bingjun1,NIU Jinghan1,SUN Zhiguo1,2,WANG Dongsheng3
1.Faculty of Infrastructure Engineering，Dalian University of Technology，Dalian 116024，China；
2.Institute of Disaster Prevention,Sanhe 065201,China;
3.Institute of Road and Bridge Engineering，Dalian Maritime University，Dalian 116026，China
To investigate the feasibility of reducing the residual displacement of reinforced concrete (RC) bridge piers by using unbounded prestressing strands,a dynamic analysis model for RC piers with vertical unbonded prestressing strands was built,and the accuracy of the model was verified by comparing the analysis results with those of quasi-static and shaking table tests.The influence of prestressing strands on the residual displacement of piers was studied.It is found that the residual displacement of piers can be reduced obviously by using the unbonded prestressing strands.And a larger prestressing strand ratio will lead to a smaller residual displacement.The initial stress of prestressing strands and the location of strands have little influence on the residual displacement of piers.The near fault ground motion is the main factor inducing the residual displacement of piers.The ratio of the residual displacement to maximum displacement of piers under far fault ground motion is less than 10%,while the ratio would increase to larger than 30% for piers under near fault ground motion.The maximum strand stress increase linearlys with the maximum lateral displacement of the pier.
[1] 孙治国,王东升,司炳君,等.采用预应力筋进行RC桥墩地震损伤控制的试验研究[J].土木工程学报,2014,47(1):107-116.
SUN Zhi-guo, WANG Dong-sheng, SI Bing-jun, et al. Experimental research on the seismic damage control techniques for RC bridge piers by using prestressing tendons [J]. China Civil Engineering Journal, 2014, 47(1): 107-116.
[2] Kawashima K, Macrae G A, Hoshikuma J I, et al. Residual displacement response spectrum [J]. Journal of Structural Engineering, ASCE, 1998, 124(5): 523-530.
[3] García J R, Miranda E. Residual displacement ratios for assessment of existing structures [J]. Earthquake Engineering and Structural Dynamics, 2006, 35(3): 315-336.
[4] Liossatou E, Fardis M N. Residual displacements of RC structures as SDOF systems [J]. Earthquake Engineering and Structural Dynamics, 2015, 44(5): 713-734.
[5] 郝建兵,吴 刚,吴智深.单自由度体系等强度残余位移谱研究[J].土木工程学报,2013, 46(10): 82-88.
HAO Jian-bing, WU Gang, WU Zhi-shen. A study on constant-relative-strength residual deformation ratio spectrum of SDOF system [J]. China Civil Engineering Journal, 2013, 46(10): 82-88.
[6] 余 波,刘 迪,杨绿峰.考虑P－Δ效应的桥梁结构震后概率残余位移分析[J].振动与冲击,2014,33(1):154-161.
YU Bo, LIU Di, YANG Lu-feng. Probabilistic residual displacement analysis of bridge structures condidering P－Δ effect [J]. Journal of Vibration and Shock, 2014, 33(1): 154-161.
[7] Fujino Y, Hashimoto S, Abe M. Damage analysis of Hanshin expressway viaducts during 1995 Kobe earthquake. I: residual inclination of reinforced concrete piers [J]. Journal of Bridge Engineering, ASCE, 2005, 10(1): 45-53.
[8] Zatar W A, Mutsuyoshi H. Residual displacements of concrete bridge piers subjected to near field earthquakes [J]. ACI Structural Journal, 2002, 99(6): 740-749.
[9] Noguez C A C, Saiidi M S. Shake-table studies of a four-span bridge model with advanced materials [J]. Journal of Structural Engineering, ASCE, 2012, 138(2): 183-192.
[10] Iemura H, Takahashi Y, Sogabe N. Development of unbonded bar reinforced concrete structure [C]. Proceeding of 13th World Conference on Earthquake Engineering, Vancouver, Canada, August 1-6, 2004.
[11] Sakai J, Mahin S A. Analytical investigation of new methods for reducing residual displacements of reinforced concrete bridge columns [R]. PEER Report 2004/02, Pacific Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley. August 2004.
[12] Lee W K, Billington S L. Modeling residual displacements of reinforced concrete bridge columns under earthquake loads using fiber elements [J]. Journal of Bridge Engineering, ASCE, 2010, 15(3): 240-249.
[13] Qu Zhe. Predicting nonlinear response of an RC bridge pier subjected to shake table motions [C]. Joint Conference Proceedings, 9th International Conference on Urban Earthquake Engineering/ 4th Asia Conference on Earthquake Engineering, March 6-8, 2012, Tokyo Institute of Technology, Tokyo, Japan.
[14] 李忠献,李 杨,李 宁.RC桥墩抗震性能分析模型与验证[J].地震工程与工程振动,2014,34(1):71-80.
LI Zhong-xian, LI Yang, LI Ning. Seismic analysis model of RC bridge piers: simulation and verification [J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(1): 71-80.
[15] 王志强,葛继平,魏红一.东海大桥预应力混凝土桥墩抗震性能分析[J].同济大学学报(自然科学版),2008,36(11):1462-1466,1500.
WANG Zhi-qiang, GE Ji-ping, WEI Hong-yi. Seismic performance of prestressed concrete bridge column of East sea bridge [J]. Journal of Tongji University, 2008, 36(11): 1462-1466,1500.
[16] 司炳君,陈 灿,孙治国,等.无黏结预应力RC桥墩抗震性能的数值分析[J].地震工程与工程振动,2014,34(3):68-76.
SI Bing-jun, CHEN Can, SUN Zhi-guo, et al. Numerical analysis of the seismic performance of unbonded prestressed RC bridge piers [J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(3): 68-76.
[17] 吴 浩,吕西林.无粘结后张拉预制剪力墙抗震性能模拟分析[J].振动与冲击,2013,32(19):176-182.
WU Hao, LÜ Xi-lin. Numerical simulation on seismic performance of unbonded post-tensioned precast shear walls [J]. Journal of Vibration and Shock, 2013, 32(19): 176-182.
[18] Zhao J, Sritharan S. Modeling of strain penetration effects in fiber-based analysis of reinforced concrete structures [J]. ACI Structural Journal, 2007, 104(2): 133-141.
[19] 张令心，张继文.近远场地震动及其地震影响分析[J].土木建筑与环境工程,2010,32(2):84-86.
ZHANG Ling-xin, Zhang Ji-wen. Study on the affection of near-fault and far-fault ground motions [J]. Journal of Civil. Architectural & Environmental Engineering, 2010,32(2):84-86.
[20] 李明,谢礼立,翟长海,杨永强.近断层地震动区域的划分[J] . 地震工程与工程振动,2009,29(5):20-25.
LI Ming, XIE Li-li, ZHAI Chang-hai, YANG Yong-qiang. Scope division of near-fault ground motion [J]. Earthquake Engineering and Engineering Dynamics, 2009,29(5):20-25.
[21] YANG Dixiong, Pan Jianwei, Li Gang. Interstory drift ratio of building structures subjected to near-fault ground motions based on generalized drift spectral analysis [J]. Soil Dynamics and Earthquake Engineering, 2010,30(11):1182-1197.
