不同桩基形式高桩码头地震动力损伤振动台试验研究

为研究不同地震动作用下钢管直桩与钢管斜桩高桩码头结构的动力反应特征及桩基结构震损模式，以某典型钢管桩基高桩码头为研究对象，基于相似准则，设计并开展了室内振动台试验研究。研究表明：远场地震动对直桩桩基码头结构的影响较大，而斜桩结构对近场地震动的激励更敏感。地震动作用下，直桩模型无明显损伤迹象；斜桩模型桩体在桩顶处发生断裂，且在固结泥面处发生了屈曲破坏。其破坏原因是：在持续强震荷载的作用下，伴随大变形的产生，大刚度斜桩结构承受了较大的地震作用，桩顶部弯矩瞬时急剧增大，致使斜桩发生断裂，导致结构的脆性破坏，属于非延性设计。基于以上研究，建议在地震动峰值加速度小于400Gal时可采用钢管斜桩高桩码头的结构形式。

Study of seismic dynamic damage on pile-supported wharf with different#br# types of piles by shaking table test

 In order to study the dynamic response characteristics and the failure mode of pile-supported wharf with different types of piles, taking a pile-supported wharf with steel pipe piles as the research object. And based on similarity criterion, shaking table test was drawn up. The results show: far-field ground motion has great influence on the structure of straight pile wharf, while the batter pile structure is more sensitive to the near-field ground motion. Under the earthquakes, the model with all vertical piles has no obvious damage sign, while the model with batter piles breaks at the top of batter pile and suffers buckling damage at the consolidation mud surface. The causes of the damage can be summarized as follows: under the constant strong earthquakes, while accompanied by large deformation, the batter piles which have larger rigid bear greater earthquake, and the bending moment at the top of piles gradually increase. These result in the fracture of the batter pile and lead to the brittle failure of the structure. Based on the research, it is suggested that the batter pile can be used in pile-supported wharf when the peaking ground acceleration is below 400Gal.