基于损伤性能的钢护筒复合桩抗撞设计方法  

Damage Behavior-Based Design Method for Steel Casing Composite Pile Subjected to Lateral Collision

作　　者：周文玮[1] 高荣雄[1] ZHOU Wenwei;GAO Rongxiong(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《土木工程与管理学报》2023年第1期71-77,84,共8页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51678264)。

摘　　要：为确保桥梁碰撞事件中的桩基安全,基于经试验验证的有限元模型,分析了不同钢护筒长度和碰撞工况下的桩基损伤状态。研究发现,同等碰撞工况下,增加钢护筒长度有利于减轻桩基损伤,且钢护筒满足最优长度后损伤程度最轻。桩顶峰值位移可表征基桩损伤严重程度,桩顶峰值位移越大,基桩受撞损伤程度越重。据此,提出基于桩顶相对位移的损伤指标。该指标不仅可以量化基桩受撞损伤程度,还有效规避了桩基尺寸参数的影响。以该损伤指标为性能水平参数,可有效对应按损伤状态划分的四级抗撞性能水平,即正常使用、修复使用、生命安全和预防倒塌。在此基础上,提出了基于损伤性能的钢护筒复合桩抗撞设计方法,并阐述了具体步骤。To ensure the safety of piles in bridge-vessel collisions, base on the finite element model the post-impact damage state of piles with different steel casing lengths and under various collision scenarios was analyzed. The results indicated that under the same collision scenario, increasing the length of steel casing was beneficial to relieve the damage. The peak displacement of pile-head can represent the damage degree. It was found that the larger the peak displacement, the more severe the damage. Therefore, a damage index based on the relative pile-head displacement was proposed. The damage index quantified the damage degree and efficiently avoided the influence of the pile dimensions. By taking this damage index as the performance parameter, four levels of impact resistance were corresponded well. The four levels were immediate serviceability, post-repair serviceability, life safety and collapse prevention. Based on the damage index, a damage behavior-based design method for steel casing composite piles under lateral collision was proposed. Detailed steps were also introduced.

关 键 词：桩基础 钢护筒 抗撞设计 性能目标 损伤指标 

分 类 号：U442.59[建筑科学—桥梁与隧道工程] U445.75[交通运输工程—道路与铁道工程]