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Influence of Transient and Partial Footing Separation on the Seismic Response of Skewed Bridges with Soil Support
International Journal of Structural Stability and Dynamics ( IF 3.6 ) Pub Date : 2021-05-25 , DOI: 10.1142/s0219455421501327
Ziqi Yang 1 , Chern Kun 1 , Dongliang Meng 1, 2 , Nawawi Chouw 1
Affiliation  

Previous research has shown that the transient and partial footing separation is one of the effective methods to reduce the impact of earthquakes on bridge structures. The separation will not only temporarily stop the transfer of seismic load to structures, but also activate rigid-like body motions of the bridge piers. Most of current investigations involving footing uplift only focused on straight bridges. The influence of skew angle is rarely considered. Even though skewed bridges are common and more vulnerable to seismic load. This work reveals the simultaneous influence of skew angle and footing uplift on soil on seismic response of bridges. A bridge with a 30 or 45 skew angle, in addition to a straight bridge, was excited using a large-scale shake table. The ground excitations were stochastically simulated based on design spectrum of New Zealand standard. The result revealed that with increasing skew angle bridges will have frequent footing uplifts. In the case of a straight bridge, although allowing footing uplift is beneficial in reducing the bending moment at the pier support, it increases the longitudinal girder displacement. In contrast, in the case of 30 and 45 skewed bridges, uplifts increase the bending moments of piers and the displacements of the girder, especially in the transverse direction.

中文翻译:

瞬态和部分基础分离对带土支撑斜桥地震响应的影响

已有研究表明,瞬态和局部基脚分离是减少地震对桥梁结构影响的有效方法之一。这种分离不仅会暂时停止地震荷载向结构的传递,还会激活桥墩的刚性体运动。目前大多数涉及基脚抬升的调查只集中在直桥上。很少考虑倾斜角的影响。即使倾斜的桥梁很常见并且更容易受到地震载荷的影响。这项工作揭示了倾斜角和基脚隆起对土壤的同时影响对桥梁地震响应的影响。带有 30 或 45 ∘的桥斜角,除了直桥外,还使用了大型振动台。地面激励是根据新西兰标准的设计谱进行随机模拟的。结果表明,随着斜角的增加,桥梁将频繁地出现基脚隆起。在直桥的情况下,虽然允许基脚抬升有利于减少桥墩支撑处的弯矩,但它会增加纵向梁位移。相比之下,在 30 和 45 ∘ 斜桥的情况下,隆起会增加桥墩的弯矩和梁的位移,特别是在横向上。
更新日期:2021-05-25
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