后张无粘结预应力装配式桥墩抗震性能分析  

Seismic Performance Analysis of Segmental Precast Unbonded Posttensioned Concrete Bridge Piers

作　　者：包龙生[1] 王娟[1] 于玲[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2014年第3期429-435,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078242);住房和城乡建设部科学技术项目(2012-K2-31);辽宁省"百千万人才工程"人选项目择优资助(2012921047)

摘　　要：目的研究节段预制无粘结后张预应力环形截面桥墩的抗震性能,为此类桥墩抗震设计提供依据.方法通过贯穿柱段的纵向钢筋(耗能钢筋ED)提供柱的滞回耗能,利用ABAQUS有限元分析软件建立实体模型,对耗能钢筋配筋率、预应力筋配筋率、预应力度等参数进行分析.结果 ED配筋率为0.75%时的抗震性能比0.5%时提高较多,配筋率为1.0%的抗震性能比0.75%时提高不大.预应力筋配筋率在0.5%时具有较好的抗震性能,在此基础上提高配筋率没有显著效果.预应力度的增加使得屈服强度有所提高,但耗能能力提高不明显.结论在一定范围内提高ED配筋率和预应力筋配筋率对于提高桥墩抗震性能有较为显著的效果,超过此范围提高不明显,预应力度影响不大,以此实现节段拼装桥墩经济性和力学性能的优化.This paper studied the seismic performance of segmental precast unbonded posttensioned concrete bridge piers with circular sections to give the reasonable design parameters of energy dissipation ratio, prestressed reinforcement ratio and prestressing degree and to provide the basis for the seismic design of bridge piers. Using longitudinal reinforcements （ energy dissipation bars ED） that are throughout the column sections, enhance hysteretic energy dissipation can be provided. Based on the finite element analysis software, ABAQUS, an entity model was built and the parameters for reinforcement ratio, ED ratio and prestressed reinforcement ratio were analyzed. The results obtained by the simulation show that the seismic performance with 0. 75 % reinforcement ratio increases more clearly than that with 0. 5 %, but seismic performances with 1.0% and 0.75% do not have some differences. The bridge pier has better seismic performance when the prestressed reinforcement ratio is 0. 5%. Further increase of this reinforcement ratio has not significant effect. Increasing the prestressing degree makes the yield strength increase, but the energy dissipation capacity increases not obviously. It indicates that increase of ED ratio and prestressed reinforcement ratio has a significant effect on the seismic performance of bridge piers in a certain range, beyond this range, the effect is not obvious. The change of prestressing degree has not significant effect. So that optimization for economic performance and mechanical properties of assembled piers can be obtained.

关 键 词：装配式桥墩 有限元模型 抗震 配筋率 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]