摘要
为研究船舶撞击场景下变截面桩的撞击动力响应,基于LS-DYNA有限元软件,建立了撞击位置距承台中心线的间距E分别为0 m、3.25 m和6.5 m时的船舶撞击变截面桩基模型,研究了在船撞作用下的撞击速度、碰撞力、承台水平位移及桩身弯矩变化规律。结果表明,撞击点距承台中心线的间距E的影响较大,在设计防撞设施时需要着重考虑撞击点距承台中心线距离的影响;桩基最不利工况是E=6.5 m即撞击点在承台角上时的工况,此时桩基所受撞击力和桩身弯矩最大,为保证桩基的安全,必须对其进行防撞设计;变截面的存在并未对桩基所受撞击破坏造成显著的影响,且变径以下部分材料用量的减少降低了工程费用,在不影响桩基承载性能的前提下,充分体现了变截面桩的经济优势。
In order to analyze and study the dynamic response of variable cross-section impact under ship impact scenario, the numerical simulation is carried out by finite element software, Considering the influence of different impact position on variable cross-section pile foundation, the variable cross-section pile foundation model of ship impact with 0 m, 3.25 m and 6.5 m from the center line of cap is established, and the variation rules of velocity, collision force, horizontal displacement of cap and bending moment of pile are studied.The results show that: the change of the impact point from the centerline E of the cap has a great influence on the ship’s impact on the pile foundation, so the influence of the impact point from the centerline of the cap should be taken into account when designing anti-collision facilities;the most unfavorable working condition of pile foundation is E=6.5 m, that is, when the impact point is on the cap angle.Under the most unfavorable working condition, the impact force and bending moment of pile foundation are the largest.In order to ensure the safety of pile foundation, anti-collision design must be carried out.The existence of variable cross-section does not have a significant impact on the impact damage of the pile foundation, and the reduction of some materials below the variable diameter reduces the project cost, which fully reflects the economic advantages of the variable cross-section pile on the basis of not affecting the bearing performance of the pile foundation.
作者
董建松
DONG Jian-song(Fujian Provincial Transportation Construction Quality and Safety Center,Fuzhou 3500o0,China)
出处
《公路》
北大核心
2022年第11期66-70,共5页
Highway
关键词
变截面桩
船舶撞击
数值模拟
动力响应
variable cross-section pile
ship impact
numerical simulation
dynamic response
