Abstract Precast segmental ultra-high performance concrete (UHPC) columns with post-tensioned (PT) tendons can effectively protect the compression toe from damage and enhance energy dissipation (ED) capacity of column compared to conventional segmental concrete columns. Extensive experiments and numerical studies have been carried out to explore the cyclic response of segmental UHPC columns in the existing literature; however, the effect of such novel columns on the seismic safety of bridge structures has not been thoroughly understood. This study aims to numerically assess the seismic fragility and seismic life-cycle loss of bridge structures supported by the precast segmental UHPC columns. For comparison, the seismic performance of the same bridge with monolithic reinforced concrete (RC) piers are also evaluated. Here, three-dimensional (3D) numerical models are generated to simulate these two bridge types. A performance-based earthquake engineering (PBEE) framework is used to evaluate and compare their seismic performance. The segmental UHPC column model is validated with the previous experimental studies. The validated model is combined into the whole bridge. Numerical results showed that the precast segmental UHPC bridge experiences similar peak acceleration and larger peak displacement in comparison to the monolithic RC bridge. The segmental UHPC bridge pier experiencing lower residual deformation can effectively reduce the damage probability and life-cycle loss of a bridge compared to the conventional monolithic RC pier. Under the design event (2475-year return period) and maximum considered event (5000-year return period), the expected losses of the segmental bridge in the lifetime were approximate 92% and 84% of that of the monolithic bridge, respectively. The segmental UHPC bridge has a noticeable economic benefit when such a bridge is constructed in regions of high seismicity.

中文翻译：

---

后张预制分段式超高性能混凝土桥柱抗震桥梁系统的概率地震脆弱性和损失评估

摘要 与传统的节段混凝土柱相比，带有后张（PT）筋的预制节段式超高性能混凝土（UHPC）柱可以有效地保护受压趾部免受损坏并提高柱的能量耗散（ED）能力。已经进行了大量的实验和数值研究来探索现有文献中的节段 UHPC 柱的循环响应；然而，这种新型柱对桥梁结构抗震安全的影响尚未完全了解。本研究旨在数值评估由预制节段 UHPC 柱支撑的桥梁结构的地震脆性和地震生命周期损失。为了比较，还评估了具有整体钢筋混凝土 (RC) 桥墩的同一桥梁的抗震性能。这里，生成三维 (3D) 数值模型来模拟这两种桥梁类型。基于性能的地震工程（PBEE）框架用于评估和比较它们的抗震性能。分段 UHPC 柱模型已通过先前的实验研究得到验证。经验证的模型组合成整个桥梁。数值结果表明，与整体 RC 桥相比，预制节段 UHPC 桥经历了相似的峰值加速度和更大的峰值位移。与传统的整体钢筋混凝土桥墩相比，具有较低残余变形的节段式超高性能混凝土桥墩可以有效降低桥梁的损坏概率和全寿命周期损失。在设计事件（2475年重现期）和最大考虑事件（5000年重现期）下，节段桥在生命周期内的预期损耗分别约为整体桥的 92% 和 84%。当这种桥梁建在地震多发地区时，节段式 UHPC 桥梁具有显着的经济效益。