Analysis of seismic performance of a prefabricated hybrid bridge pier system(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年01期
- Page:
- 70-80
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Analysis of seismic performance of a prefabricated hybrid bridge pier system
- Author(s):
- ZHANG Yu-ye; WU Gang; SUN Ze-yang; TENG Ge
- （1. Key Laboratory of C & PC Structure of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu,〖JP〗China; 2. School of Science, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)
- Keywords:
- bridge engineering; prefabricated bridge pier; hybrid system; antiseismic; design parameter
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to enhances the ductility and energy dissipation capacity of the prefabricated bridge piers during earthquakes, a novel prefabricated hybrid bridge pier system, which combines a monolithic castinsitu pier system with a prefabricated posttensioned pier system, was designed. The design idea, construction, and mechanical behavior of the prefabricated hybrid bridge piers were introduced. Their performance objectives were analyzed under three levels of ground motions. Threedimensional finite element models of the piers were established, and the numerical results were verified by comparing them with previous test results. The seismic performances of different types of piers were analyzed in terms of concrete strain, prestressing behavior, hysteretic characteristics, and joint openings of the models under cyclic loads. The influences of three design parameters, namely base segment height, initial prestressing level, and prestressing layout on the seismic performance of the piers were studied. The results show that compared with conventional prefabricated posttensioned piers， the proposed hybrid piers have greater initial stiffness, lateral carrying capacity, ductility, and energy dissipation, owing to the antiseismic abilit, provided by the joint rocking behavior and the plastic hinging mechanism at the base segment. As the slender ratio of base segment rises from 1.2, the proposed hybrid piers exhibit a decreasing displacement ductility and a growing residual deformation. The initial prestressing level has different influences on the lateral carrying capacity, displacement ductility, and initial stiffness of the two types of piers. For the proposed hybrid piers, the ideal prestressing level is around 40%. The prestressing at the section edge of the hybrid piers can effectively mitigate the damage to the concrete near the joint, and enhance the lateral carrying capacity. This research can provide a reference for the seismic design and performance optimization of prefabricated bridge piers. 8 tabs, 14 figs, 22 refs.
Last Update: 2019-01-28