铁道科学与工程学报2017，Vol.14Issue(11)：2390-2398,9.
2段式预制拼装预应力混凝土桥墩的抗震性能
Seismic performance analysis of two-segment bridge columns with prestressing bars
摘要
Abstract
Taking a rail transit pier under construction as the prototype, a conventionally reinforced concrete (RC) bridge column specimen and a segmental prestressed precast reinforced concrete (PCS) bridge column specimen with a scaling factor of 1/3 were designed. Using the quasi-static test methods, the normal operational performance and seismic performance of the reduced scale RC specimen were analyzed firstly, and then the normal operational performance and seismic performance of the reduced scale PCS specimen in accordance with the equivalent seismic performance design principles were analyzed secondly. The results showe that the cracking load of PCS specimen is 1.5 times bigger than RC piers. The PCS pier under earthquake was less damaged; the cracking and damage was mainly concentrated on the bottom of the pier. In the same maximum deflection drift of 6%, the residual displacement of the PCS specimen was only 44% of the RC specimen, and energy dissipation value of the specimen PCS was only 1/3 of RC specimen. The initial stress of the prestressed screw thread steel bar was taken as 30% of the yield strength, because the screw thread steel bar could delay fracture at the lateral drift of 6%. In summary, the skeleton curve of the load-displacement relationship of the specimen PCS can be comparable with specimen RC in the maximum extent, and PCS pier can have smaller residual displacement and better self-centering capability, but less energy-dissipation capacity than RC pier.关键词
预制混凝土/预应力混凝土/桥梁墩柱/精轧螺纹钢筋/抗震性能Key words
precast concrete/prestressed/bridge columns/screw thread steel bar/seismic performance分类
交通工程引用本文复制引用
葛继平,闫兴非,王志强..2段式预制拼装预应力混凝土桥墩的抗震性能[J].铁道科学与工程学报,2017,14(11):2390-2398,9.基金项目
国家自然科学基金资助项目(51408360) （51408360）
上海市科委工程技术研究中心建设专项资助项目(17DZ2251900) （17DZ2251900）
