论文标题：Investigation on lateral seismic isolation system of a typical long-span single-tower cable-stayed bridge for mountainous areas

期刊：Frontiers of Structural and Civil Engineering

作者：Shichun ZHANG, Junjun GUO, Wei LIU, Jibo LI, Zhongguo GUAN

发表时间：15 May 2024

DOI：10.1007/s11709-025-1132-4

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文章亮点/Highlights

本研究聚焦于一种特别适用于山区、具有显著非对称跨度布置特征的典型大跨度独塔斜拉桥，旨在探究横向隔震体系的优化设计方法。

以金沙江大桥为工程背景，通过动力时程分析，揭示了结构非对称性对地震响应的影响机制，发现该特性会导致多振型耦合的复杂动力响应，且横向地震响应呈现显著的多振型主导特征。

为模拟不同的滞回特性，研究采用了由理想弹塑性单元和多线性弹性单元组成的复合滞回模型，通过参数化分析确定了最优阻尼特性。结果表明，具有倒S形滞回曲线的阻尼器表现出较低的等效割线刚度，能有效协调塔柱与桥墩间显著的横向刚度差异，实现更高效的阻尼效果，并减小塔柱/桥墩的基底剪力。此外，基于影响矩阵法建立的阻尼器服力优化模型显示，其与横向固定体系支座剪力存在显著相关性。

研究还进一步探讨了包括地形和场地条件在内的地质环境因素的影响，提出差异化隔震方案：当边跨跨越陡峭山谷斜坡时，应在所有塔柱/桥墩位置设置阻尼器；而当边跨跨越平缓山谷斜坡时，则可省略辅助墩阻尼器。与硬场地相比，软场地需要更大的阻尼器屈服力，且会导致更大的地震响应。

模拟方法的实验验证：（a）倒S形曲线;（b）旗形曲线

摘要/Abstract

This study focuses on a reasonable lateral isolation system for a typical long-span single-tower cable-stayed bridge with a significantly asymmetric span arrangement that is particularly suitable for mountainous areas. Based on the Jinsha River Bridge, the significant structural asymmetry and its effects on structural seismic responses were analyzed. The significantly asymmetric characteristics could result in complex dynamic behavior in seismic conditions and the lateral seismic responses of the structure are governed by multiple modes. A multilinear model composed of an ideal elastoplastic element and a multilinear elastic element was used to simulate different hysteresis, and a parametric analysis was conducted to investigate the appropriate damping hysteresis for the lateral seismic isolation of such a bridge. It shows that the inverted S-shaped hysteresis has relatively smaller secant stiffness and could help to balance the great difference in the lateral stiffness of the tower/piers. Thus, the inverted S-shaped hysteresis could lead to more efficient damping effects and less base shear forces of the tower/piers. A correlation between the reasonable yield forces of the dampers in the lateral isolation system, determined through an influence matrix-based method, and the shear forces of the corresponding bearings in the lateral fixed system was also observed. Moreover, the influence of geological conditions including different terrain and site conditions on the reasonable lateral isolation system was further investigated. It suggests to use dampers at all tower/pier locations when the side span crosses a steep valley slope, while a lateral isolation system without using dampers at the auxiliary piers could be employed when the side span crosses a gentle valley slope. Soft sites require larger damper yield forces and cause greater seismic responses compared to hard sites.

关键词/Keywords

single-tower cable-stayed bridge; lateral isolation system; multilinear model; influence matrix; geological conditions

引用信息/Citation Information

Shichun ZHANG, Junjun GUO, Wei LIU, Jibo LI, Zhongguo GUAN. Investigation on lateral seismic isolation system of a typical long-span single-tower cable-stayed bridge for mountainous areas. Front. Struct. Civ. Eng., 2025, 19(3): 341–357 https://doi.org/10.1007/s11709-025-1132-4

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https://doi.org/10.1007/s11709-025-1132-4

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