摘要
为研究船桥碰撞模拟中的桩土相互作用问题,建立了单桩-土-船舶高精度碰撞有限元模型,采用桩底固结、土弹簧及无反射边界模拟桩土相互作用,并计算了船舶撞击力以及船撞作用下桩基的位移响应。计算结果表明:在桩基固结条件下,当桩基固结深度大于5倍桩径时,船舶撞击力趋势与另外两种模拟方式计算结果区别较大;在撞击过程中撞击力出现卸载现象,说明船舶与桩基之间出现了一次逐渐脱离的状态。在无反射边界条件下,模拟得出的撞击力与桩基位移响应均最小,不同的固结深度对计算结果影响较大。在土弹簧条件下,计算撞击力小于最小固结深度模拟计算的撞击力。通过分析,桩基的动力响应不仅与最大船撞力、平均船撞力相关,且与船撞力时程持续时间有关。当无详细地质资料时,可采用3倍桩径固结深度对桩底固结,所得动力响应比较安全,可满足工程应用需要。
To study the pile-soil interaction in vessel-bridge collision,a high-precision finite element model of pile-soil under ship collision was simulated in three scenarios:pile bottom fixed,soil spring,and nonreflecting boundary.Then,the impact force and displacement of pile under vessel collision were calculated.Results show that in the pile bottom fixed scenario,when the fixed depth of pile was greater than 5 times of the pile diameter,the trend of impact force was different from those of other two scenarios,i.e.,in the course of impact,an unloading of the impact force would occur,indicating that a gradual detachment state appeared between vessel and pile.In the non-reflecting boundary scenario,the impact force and pier displacement obtained was the smallest and the calculation results were affected greatly by different fixed depth.In the soil spring scenario,the impact force calculated was less than that of the least fixed depth in the pile bottom fixed scenario.Based on the analysis,the dynamic response of the pier was not only related to the maximum impact force and the average impact force,but also related to the duration of the impact force.In case of no available detailed geological data,it is suggested to take the fixed depth equivalent to 3 times of the pile diameter,in which the dynamic response would be relatively safe and could satisfy the requirement of engineering safety codes.
作者
邵俊虎
宋帅
占玉林
于海莹
王乾蕴
SHAO Jun-hu;SONG Shuai;ZHAN Yu-lin;YU Hai-ying;WANG Qian-yun(School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China;Institute of Technology, Sichuan Normal University, Chengdu 610101, China;College of Engineering and Technology, Chengdu Technology University, Leshan 614000, China;School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)
出处
《科学技术与工程》
北大核心
2020年第30期12576-12581,共6页
Science Technology and Engineering
基金
四川省科技计划(2017JY0514)
四川师范大学自制仪器项目(ZZYQ2018001)
国家自然科学基金(51878564)
国家重点研发计划(2016YFB1200401)
四川省教育厅项目(18ZA0411)。
关键词
船桥碰撞
桩土相互作用
无反射边界
土弹簧
动力响应
vessel-bridge collision
pile-soil interaction
non-reflecting boundary
soil spring
dynamic response
