摘要
为了验证拱形桥梁拱形防撞装置船撞有限元结构计算中结构应变响应的准确性以及寻找计算中影响应变响应的因素,通过拱形防撞装置1:25比例模型摆锤碰撞试验以及有限元数值模拟进行对比验证分析.对拱形防撞装置1:25比例模型进行摆锤碰撞试验,采集试验中碰撞力和关键点的应变响应曲线,并对试验进行漂浮状态下无阻尼和有阻尼两种情况的数值模拟对比分析.分析发现无阻尼模型计算出的应变响应不论是响应趋势还是应变峰值点的大小都与试验相差较大.通过在有限元无阻尼模型中引入Rayleigh质量比例阻尼分析,试验采集到的应变峰值与有限元数值模拟分析出的应变峰值之间的误差约为8.7%,应变响应趋势也基本一致.因此,有阻尼计算模型可应用于实际结构的计算中,应变峰值误差也可作为实际结构应力计算结果评价的参考指标,并可将该误差作为工程安全系数的一部分来考虑.
In order to certify the accuracy of structural strain response and seek the influencing factors on strain response in finite element collision analysis between ship and arch anti-collision facility of arch bridge, the comparison analysis was conducted between test and numerical simulation. The Pendulum collision test of 1：25 arch anti-collision device model was executed to collect the collision force and strain response of key points on structure. Un-damped numerical simulation of the pendulum collision test was also carried out to compare with the test. The results show that a wide gap between test and numerical simulation of strain response trend or strain response peak exists. However, the strain response trend becomes basically identical and the strain response peak error between test and numerical simulation decreases by 8.7% after the Rayleigh damping model is introduced. Therefore, the finite element model with damping can be used to analyze the actual structure, the strain peak error can be applied to evaluate the stress as a reference index and is considered as a part of project safety coefficients.
出处
《力学季刊》
CSCD
北大核心
2016年第1期170-175,共6页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(51408082)
交通运输部科技项目(2015319814040)
重庆市教委科技项目(kj1400320)
西部交通建设科技项目(2011318350990)
关键词
碰撞
防撞装置
模型试验
有限元
应变响应
collision
anti-collision device
model experiment
finite element
strain response
