Residual displacement of RC bridge piers with vertical unbonded prestressing strands

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (6) : 75-85.

SI Bingjun1,NIU Jinghan1,SUN Zhiguo1,2,WANG Dongsheng3

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Abstract

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.

Key words

seismic design of bridge / RC bridge pier；unbonded prestressing strand；time history analysis；residual displacement

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SI Bingjun1,NIU Jinghan1,SUN Zhiguo1,2,WANG Dongsheng3. Residual displacement of RC bridge piers with vertical unbonded prestressing strands[J]. Journal of Vibration and Shock, 2017, 36(6): 75-85

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