高桩防撞墩动力大变形分析及防撞设计新方法  

Dynamic analysis of anti-collision pier on elevated piles with large lateral displacement and its new energy-control based design method

作　　者：郭杰锋[1,2] 朱斌[1,2] 陈海君 陈云敏[1,2] 

机构地区：[1]软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058 [3]浙江省交通规划设计研究院,浙江杭州310027

出　　处：《海洋工程》2010年第1期9-17,共9页The Ocean Engineering

基　　金：国家自然科学基金资助项目(50608062);浙江省交通厅科技资助项目(2007H14);浙江省电力公司科技项目

摘　　要：通过引入合理的船舶与防撞墩相互作用模型及桩基动力p-y曲线法,建立船舶撞击高桩防撞墩的动力学分析模型。通过分析撞击系统的动力响应及能量转移规律发现,撞击过程中水平变形性能较好的高桩通过水平大变形而吸收大部分撞击能量,此时高桩破坏以桩身最大弯矩作为控制标准;船首强度、混凝土防撞墩总质量及桩周土强度参数对撞击过程中桩身最大弯矩影响不大。传统水上结构防撞设计方法不再适于这类刚度较小结构的防撞设计,通过对比分析,提出了工程上适用的基于能量控制的防撞设计新方法。Based on a proposed model of reasonable interaction between the ship and the anti-collision pier on elevated piles and the dynamic p-y curve method of the pile, a dynamic analysis model is presented for the anti-collision pier on elevated piles subjected to collision of the ship. According to the systematic analyses of the dynamic response and the law of energy transformation in the whole collision system, it is found that elevated piles having large lateral displacement ability can absorb most of the collision energy through their large lateral displace- ments during the collision. The maximum bending moment can be used to evaluate the destruction of these piles. The strength of the ship head, the mass of the concrete pier and the strength parameters of soils around the pile have no significant effect on the maximum bending moment of piles. Superior to the traditional anti-collision design methods which are not reasonable for this kind of flexible structure, a new energy-control based design method is proposed for the anti-collision pier on elevated piles.

关 键 词：防撞墩 高桩 船舶 撞击 能量控制 

分 类 号：U443.26[建筑科学—桥梁与隧道工程]