Shi Jun, Deng Yuang, Zhang Yi, Shi Feiting, Yang Jian
School of Civil Engineering, Central South University, Changsha 410075, China.
National Engineering Laboratory for High-Speed Railway Construction, Changsha 410075, China.
Materials (Basel). 2023 Feb 28;16(5):1981. doi: 10.3390/ma16051981.
To investigate the seismic performance of prefabricated circular hollow piers with socket and slot connection, eight 1/3.5-scale specimens constructed with polyvinyl alcohol (PVA) fiber at the pier body were tested. The main test variables included the axial compression ratio, grade of pier concrete, shear-span ratio, and stirrup ratio. The seismic performance of prefabricated circular hollow piers was studied and analyzed from the aspects of the failure phenomenon, hysteresis curve, bearing capacity, ductility index, and energy dissipation capacity. The test and analysis results showed that all specimens suffered from flexural shear failure, and the increase in axial compression ratio and stirrup ratio would lead to more significant spalling of the concrete at the bottom of the specimen, but the existence of PVA fiber would improve this phenomenon. In a certain range, the increase in axial compression ratio, stirrup ratio, and the decrease in shear span ratio can improve the bearing capacity of the specimens. However, an excessive axial compression ratio would easily lead to a decrease in the ductility of the specimens. The increase in the stirrup ratio and shear-span ratio caused by the change in height can improve the energy dissipation characteristics of the specimen. On this basis, an effective shear-bearing capacity model of the plastic hinge area of prefabricated circular hollow piers was proposed, and the prediction effects of specific shear capacity models on test specimens were compared.
为研究采用套接和槽接的装配式圆形空心桥墩的抗震性能，对8个在桥墩主体采用聚乙烯醇（PVA）纤维制作的1/3.5缩尺试件进行了试验。主要试验变量包括轴压比、桥墩混凝土等级、剪跨比和箍筋率。从破坏现象、滞回曲线、承载力、延性指标和耗能能力等方面对装配式圆形空心桥墩的抗震性能进行了研究和分析。试验及分析结果表明，所有试件均发生弯剪破坏，轴压比和箍筋率的增加会导致试件底部混凝土剥落更显著，但PVA纤维的存在会改善这一现象。在一定范围内，轴压比、箍筋率的增加以及剪跨比的减小可提高试件的承载力。然而，轴压比过大容易导致试件延性降低。高度变化引起的箍筋率和剪跨比的增加可改善试件的耗能特性。在此基础上，提出了装配式圆形空心桥墩塑性铰区的有效抗剪承载力模型，并比较了特定抗剪承载力模型对试验试件的预测效果。
