摘要
首先,阐述了单层网壳结构在冲击荷载下的能量传递、转换和消耗的过程,并基于能量守恒推导了首次冲击中网壳吸收的能量以及结构动位移简化计算方法。然后,介绍了数值分析方法的算法基础以及求解冲击问题的通用有限元软件ANSYS/LS-DYNA。最后,研究了网壳结构在不同冲击物质量比与速度作用下的动力响应,总结了动力响应与结构能量之间的关系,并与简化计算方法进行对比。结果表明:所推导的网壳能量吸收与结构动位移计算方法是合理的;冲击过程中网壳吸收的能量以及结构响应与冲击物和网壳之间的质量比密切相关;不同的动力响应模式可以利用结构吸收的能量进行区域划分;在不同的冲击能量作用下,冲击力是半正弦或者三角形脉冲;计算所得的杆件应力-应变曲线与材料的本构关系是相符的。
Firstly,energy transfer,conversion and consumption process of single-layer reticulated shell under impact loading was expounded,the initial impact energy absorbed in shell and the structural dynamic displacement analytical calculation method were derived based on energy conservation.Secondly,algorithm foundation of numerical analysis methods and finite element software ANSYS/LS-DYNA which was devoted to solve the impact problem were introduced.Finally,the dynamic response of reticulated shell under different impact mass ratios and speed was studied,the relationship between the dynamic response and structure energy were summarized and compared with that of the simplified calculation method.The results showed that the proposed simplified calculation method for reticulated shell energy absorption and dynamic displacement was proved to be reasonable by comparing the results of the numerical analysis.The energy absorption and structural response were closely related to mass ratio during the impact process.Different structural dynamic response modes could be divided by structure energy.The impact force was half sine or triangular pulse under different impact loads.The calculated stress-strain curve was consistent with material constitutive relationship.
出处
《工业建筑》
CSCD
北大核心
2017年第11期155-162,共8页
Industrial Construction
基金
国家自然科学基金项目(51608245)
北方民族大学引进人员科研启动经费资助项目(4400302545)
北方民族大学2017年重点科研项目(2017KJ38)
宁夏高等学校科学技术研究项目(NGY2016150)
关键词
能量法
动力响应
简化计算方法
质量比
冲击荷载
energy method
dynamic response
simplified calculation method
mass ratio
impact load
