摘要
为研究箍筋含量对聚丙烯纤维水泥基复合材料(PP-ECC)实心墩抗震性能的影响,设计并制作了3个含箍率不同的PP-ECC实心墩,并用1个普通混凝土实心墩作为对比试件,对4个试件进行了低周往复荷载作用下的拟静力试验.获得了PP-ECC及普通混凝土实心墩的破坏过程和破坏特征,基于试件实测的荷载-位移滞回曲线和骨架曲线等试验结果,探讨了箍筋含量对PP-ECC桥墩的承载能力、变形性能及耗能能力的影响规律,并与普通混凝土桥墩的抗震性能指标进行了对比分析.结果表明:与普通混凝土桥墩相比,墩底塑性铰采用PP-ECC可以改善桥墩的破坏形态和损伤程度,显著提高其位移延性和耗能能力,但对试件的承载能力影响较小;PP-ECC基体中的纤维在一定程度上具有箍筋的作用,在配蒱率较低情况下,PP-ECC桥墩仍具有良好的抗震性能;塑性铰区配箍率越高,PP-ECC桥墩的滞回曲线越饱满,试件的位移延性系数和黏滞阻尼系数越大,抗震性能越好.
In order to investigate the effect of stirrup content on the seismic performance of polypropylene-engineered cementitious composite(PP-ECC)solid piers,three PP-ECC solid piers with different stirrup ratio,and another normal concrete solid pier,were tested by quasi-static low-cycle repeated loading.The failure processes and damage characteristics were obtained.The effect law of stirrup content on the bearing capacity,deformation performance and energy dissipation capacity of PP-ECC piers were investigated based on the experimental results such as load-displacement hysteretic curves and skeleton curves.And the seismic performance indexes were compared and analyzed with the normal concrete pier.According to the results,the use of PP-ECC in the plastic hinge region at the pier bottom can improve the failure modes and damage degree when compared with the normal concrete pier.And they can also significantly improve the displacement ductility and energy dissipation capacity.But they have little effect on the bearing capacity.The fibers in the PP-ECC act as stirrup to some extent.PP-ECC piers still have good seismic performance when the ratio of the stirrups is low.And the higher the stirrup ratio of the plastic hinges,the fuller of the hysteresis curves,and the greater displacement ductility ratio as well as the viscous damper factor,which represents better seismic performance.
作者
贾毅
赵人达
王永宝
李福海
JIA Yi;ZHAO Renda;WANG Yongbao;LI Fuhai(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Chengdu 610031,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第12期79-84,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51778531)
国家重点研发计划资助项目(2016YFB1200401)
关键词
桥梁工程
实心墩
拟静力试验
聚丙烯纤维水泥基复合材料
配箍率
位移延性
bridge engineering
solid pier
quasi-static test
polypropylene fiber reinforced cement composite
volume-stirrup ratio
displacement ductility
