摘要
为探究箱型梁在循环中垂和中拱载荷作用下的累积塑性递增特征,研究箱型梁在递增塑性破坏下的极限强度衰减规律,本文在可替换试样极限弯矩试验设计基础上,创新性地设计了一种不间断循环弯矩加载的极限弯矩试验装置,开展了多种工况下的箱型梁四点弯曲极限强度试验。结合数值仿真,分析了循环载荷作用下箱型梁的累积塑性临界点、塑性累积变形以及中性轴高度变化的特征,研究了恒幅或变幅的转角载荷对箱型梁极限强度衰减的影响,从而确定了遭遇随机极端波浪载荷的船舶极限承载能力评估范围,以确保船舶在恶劣海况下航行的安全性与可靠性。
In order to explore the plastic accumulation characteristics of box girders under cyclic hogging and sagging bending moment loads and to study the attenuation law of ultimate strength of box girders based on incremental plastic failure,this paper creatively designed a test device for continuous cyclic bending moment loading,and carried out a series of four-point bending ultimate strength tests on box girders under different loading conditions based on replaceable box girder specimen.Combined with numerical simulation,this study analyzed the variation characteristics of cumulative plasticity critical point,cumulative plastic deformation and neutral axis height of box girders under cyclic loading,and then the influence of constant and variable amplitudes of rotation angle loads on the ultimate strength attenuation of box girders was evaluated.After these investigations,the fluctuating range for the ultimate bearing capacity of ships encountering random extreme waves bending loads was determined to ensure the safety and reliability of ships sailing in severe sea conditions.
作者
潘晋
张得功
宋召军
许仁杰
PAN Jin;ZHANG De-gong;SONG Zhao-jun;XU Ren-jie(Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Marine Design and Research Institute of China,Shanghai 200011,China)
出处
《船舶力学》
北大核心
2025年第12期1919-1929,共11页
Journal of Ship Mechanics
关键词
箱型梁
极限强度
累积塑性
模型试验
box girder
ultimate strength
plastic accumulation
model test
