力学与实践 ›› 2021, Vol. 43 ›› Issue (2): 234-243.DOI: 10.6052/1000-0879-20-329

• 应用研究 • 上一篇    下一篇

冰脊压剪试验及其对直立结构冰载荷的离散元分析 1)

朱红日2)(), 季顺迎3)()   

  1. 大连理工大学工业装备结构分析国家重点试验室,辽宁大连 116024
  • 收稿日期:2020-08-10 修回日期:2020-11-08 出版日期:2021-04-20 发布日期:2021-04-20
  • 通讯作者: 朱红日,季顺迎
  • 作者简介:3)季顺迎,教授,主要从事寒区海洋工程研究。E-mail: jisy@dlut.edu.cn
    2)朱红日,博士研究生,主要从事海洋结构冰载荷数值计算。E-mail: zhuhongri@126.com;
  • 基金资助:
    1)国家重点研发计划重点专项(2018YFA0605902);国家重点研发计划重点专项(2016YFC1401505);国家自然科学基金(51639004);国家自然科学基金(41576179)

DISCRETE ELEMENT ANALYSIS OF PUNCH THROUGH TEST OF ICE RIDGE AND ITS LOADS ON VERTICAL STRUCTURE 1)

ZHU Hongri2)(), JI Shunying3)()   

  1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2020-08-10 Revised:2020-11-08 Online:2021-04-20 Published:2021-04-20
  • Contact: ZHU Hongri,JI Shunying

摘要:

为更准确地分析冰脊与海洋结构的相互作用,本文提出一种基于粘结球体单元的冰脊离散元方法,其中龙骨与脊帆由不同尺寸的单元随机排列而成,整体呈各向同性。采用该方法模拟了一系列龙骨压剪试验,结果表明此方法能较好地表现龙骨的力学特性,且弹性模量、粘聚强度、内摩擦角等计算参数不仅影响龙骨的压剪强度,还影响其破坏模式。最后计算了冰脊与圆形直立结构的相互作用过程,其结果与ISO 19906规范结果相近,证明了该方法的可靠性。

关键词: 冰脊, 离散元方法, 压剪试验, 直立结构, 冰载荷

Abstract:

To determine the interaction between the ice ridges and the ocean structures, a discrete element method (DEM) is used to model the ice ridge based on the bonded spherical elements in this paper. The keel and the sail of the ice ridge are constructed with various sized spherical elements via a random packing. A series of punches through tests on the keel are simulated with the proposed DEM. The reliability of the model is verified by comparing the calculated results with the measured field data. The influences of the elastic modulus, the bonding strength and the internal friction coefficient of the elements on the shear strength and the fracture mechanism of the keel are analysed. Finally, the interaction between the ice ridge and a cylindrical vertical structure is simulated with the calibrated discrete element parameters. The ice load compares well with the ISO 19906 formula. This presented DEM can be applied to determine the ice load on offshore structures.

Key words: ice ridge, discrete element method, punch through test, vertical structure, ice load

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