摘要
针对复杂模型的简化,对连续变截面钢箱梁桥进行了模态频率影响分析,提出了利用有限元计算来量化温度对复杂结构频率影响的方法.分析结果得出:环境温度主要通过使结构尺寸变化、使连续梁此种超静定结构产生次内力以及使结构材料的弹性模量发生改变这三种方式影响结构模态频率,其中结构尺寸变化的影响十分微小,可以忽略;环境温度对结构模态频率的影响程度主要取决于结构形式、材料、截面大小以及结构内力状态.模型分析显示:不同温度模式对结构变形和内力的影响差别很大;体系温差对变截面钢箱梁桥频率的影响主要是由弹性模量随温度的变化而引起的;主梁温度梯度对频率的影响体现在温度内力的改变上.
In view of the simplification of complex models, the influence analysis of modal frequency is done on the con- tinuous variable cross section steel box girder bridge, and the finite element method of measuring the effect of temperature on the frequency of complex structures is proposed. The analysis results show that： the environmental temperature influences the structure modal frequency in three major ways： the change of the structure size, the production of secondary internal force from the continuous beam of the statically indeterminate structure, and the elastic modulus change of the structure material; wherein the structure size change is very small, so it can be neglected; the effect of environmental temperature on structure modal frequency mainly depends on the structure style, material, section size and the internal force of the structure. The model analysis shows that： the effect of different temperature patterns on the structure deformation and internal force varies widely; the effect of the system temperature difference on variable cross section steel box girder bridge frequency is mainly caused by the change of elastic modulus with temperature; the effect of temperature gradient of the main beam on the fre- quency is reflected in the internal force change of temperature.
出处
《天津城市建设学院学报》
CAS
2012年第4期262-265,共4页
Journal of Tianjin Institute of Urban Construction
关键词
温度
模态频率
钢箱梁
有限元
temperature
modal frequency
steel box girder
finite element
