Seismic behavior of thin-walled stirrup-confined circular concrete-filled steel tube piers: Experimental, numerical, and restoring force model analysis
Seismic behavior of thin-walled stirrup-confined circular concrete-filled steel tube piers: Experimental, numerical, and restoring force model analysis
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DOI：
10.1016/j.soildyn.2023.108310
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发表时间：
2024-01
影响因子：
4
通讯作者：
Hao-Jun Sun;Qingyuan Xu;Fa-xing Ding;Liping Wang;Fei Lyu;Said Ikram Sadat
中科院分区：
文献类型：
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作者：
Hao-Jun Sun;Qingyuan Xu;Fa-xing Ding;Liping Wang;Fei Lyu;Said Ikram Sadat
采用拟静力试验方法，对薄壁箍筋约束圆钢管混凝土桥墩的抗震性能进行了研究。此外，有限元模型（FEM）开发，将混凝土裂缝和钢材延性损伤。基于有限元分析和试验结果，提出了一种考虑捏缩效应系数和拐点的桥墩精细恢复力模型。研究结果表明，钢管混凝土桥墩的抗震性能优于无约束桥墩。这种增强是明显的，屈服和水平峰值载荷分别显著增加30.3%和31.4%，沿着累积能量耗散和弹性刚度显著增加9.1%和5.3%。此外，改进的RFM表现出良好的精度，与测试和有限元结果密切一致。这种改进的RFM有可能作为TSCCFT桥墩抗震设计的参考，简化设计过程。
An investigation was conducted using pseudo-static testing to analyze the seismic behavior of thin-walled stirrup-confined circular concrete-filled steel tube (TSCCFT) piers. In addition, a finite element model (FEM) was developed, incorporating concrete cracks and steel ductile damage. Moreover, based on the FEM and test outcomes, a refined restoring force model (RFM) for these piers was proposed, considering pinching effect coefficients and inflection points. The research results demonstrate that TSCCFT piers outperform counterparts lacking stirrup confinement regarding seismic performance. This enhancement is evident in significant increases of 30.3 % and 31.4 % for yield and horizontal peak load, respectively, along with notable increases of 9.1 % and 5.3 % concerning cumulative energy dissipation and elastic stiffness. Furthermore, the refined RFM demonstrates excellent precision, closely aligning with test and FEM results. This refined RFM holds the potential to serve as a reference for the seismic design of TSCCFT piers, streamlining the design process.