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附有结构“保险丝”构件的桥墩抗震性能试验研究及其应用

, PP. 59-70

Keywords: 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

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Abstract:

?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。

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