摘要
基于结构"保险丝"概念设计了不同形式桥墩,采用拟静力试验和数值方法研究了此类桥墩的抗震性能及耗能能力,验证了桥墩纤维模型及等效模型的适用性;将试验桥墩原型的纤维和等效模型应用于一座试设计的超大跨斜拉桥纵向地震损伤控制分析中,采用弹塑性方法并引入地震损伤指标评价了耗能型桥墩对桥梁地震损伤的控制效果,结合数值方法和试验结果验证了所提出的地震损伤控制新结构体系的有效性和可行性。结果表明:附有"保险丝"构件的新型耗能桥墩的抗震性能及耗能能力优于传统型独柱式桥墩;采用新型耗能桥墩的损伤控制策略可有效控制主塔损伤,使其满足地震损伤控制目标;桥墩柱间附加的"保险丝"构件不仅可提高桥墩刚度,而且对桥墩具有很好的耗能与保护作用。
Pseudo static tests and numerical simulation were used to investigate the seismic performance and energy dissipation capacity of piers designed according to the structural fuse concept. The applicability of fiber and equivalent models for piers was proved to be reasonable according to the experimental results. Both models of the piers were applied in the seismic damage control of a trial-designed long span cable-stayed bridge in the longitudinal direction and the effect of energy dissipation piers on seismic damage control of the bridge was evaluated with elastoplastic method by using seismic damage indices. Furthermore, the proposed new structural system was further verified through combination of the simulation and experimental results. The results show that the seismic performance and energy dissipation capacity of piers with fuse element are superior to a conventional single-column pier; the employment of damage control strategy with energy dissipation piers is effective and feasible to control the seismic damage of towers and meets the damage control targets; the supplemental fuse element between two columns can enhance the stiffness and energy dissipation capacity of piers and mitigate the seismic damage of piers.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2014年第3期59-70,共12页
China Journal of Highway and Transport
基金
国家自然科学基金项目(90915011
91315301)
关键词
桥梁工程
耗能型桥墩
抗震性能试验
超大跨斜拉桥
结构“保险丝”概念
地震损伤控制
bridge engineering
energy dissipation pier
seismic performance test
super long span cable-stayed bridge
structural fuse concept
seismic damage control
