破碎波冲击作用下沉箱式防波堤振动-摇摆运动分析  

VIBRATING-ROCKING ANALYSIS OF CAISSON BREAKWATER UNDER BREAKING WAVE IMPACT

作　　者：王元战[1] 王立强[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]解放军海军后勤学院,天津300456

出　　处：《振动与冲击》2001年第3期21-25,共5页Journal of Vibration and Shock

摘　　要：文中建立了沉箱式防波堤弹性振动 -摇摆运动分析模型 ,可对破碎冲击作用下防波堤的弹性振动 -摇摆运动过程进行数值摸拟。研究了摇摆运动对防波堤位移、转角、滑移力和倾覆力距的影响。结果表明 ,当倾覆力距大于防波堤的稳定力矩时 ,防波堤并不一定发生倾倒破坏 ;只有当防波堤摇摆运动转角大于倾倒的临界角时 ,防波堤才会发生倾倒破坏。而且摇摆运动可有效减小防波堤的滑移力和倾覆力矩。故在极限设计破碎波浪条件下可考虑允许防波堤出现摇摆运动 ,以实现更为经济的结构设计。A vibrating_rocking motion model of caisson breakwater under breaking wave impact is presented,which can be used to simulate its histories of vibrating_rocking motion.The effect of rocking motion on the displacement,rotation,sliding force and overtuming moment of breakwater is investigated.In case the overtuming moment exceeds the stability moment of caisson,the caisson may only rock with no overtuming and will overturn only in case the rocking angle exceeds a critical angle.It is shown that the sliding force and overtuming moment of breakwater can be reduced effectively due to the rocking motion.It is proposed that rocking motion should be allowed in breakwater design.

关 键 词：沉箱式防波堤 破碎波 振动-摇摆运动 数值模拟 动力响应 冲击作用 弹性振动-摇摆运动方程 

分 类 号：O656.2[理学—分析化学] O347[理学—化学]