摘要
分析爆炸荷载作用下单自由度钢梁结构失效概率,是分析钢梁建筑结构材料强度和可靠性的重要指标。建筑结构本身体现着材料的静动态属性、结构构件的尺寸等随机属性。考虑了建筑结构构件的随机属性和单自由度特性,构建单自由度钢梁结构爆炸荷载的统计模型,对结构构件钢梁动力响应的受力点进行可靠度分析,分析钢梁构件尺寸在不确定爆炸荷载下增强受力点,构建钢梁动力响应的受力点反馈模型。得到了随机属性下的不确定爆炸荷载作用下钢结构中梁的中度破坏功能函数,构建单自由度钢梁结构失效概率分析模型。试验得出,程序计算的梁跨中位移时程曲线均与试验曲线吻合较好,钢梁的材料及尺寸的不确定性和钢梁的失效概率-比例距离曲线完全吻合,该模型方法在对单自由度钢梁在爆炸荷载作用下的失效概率研究可靠性较高。
The analysis of blast load place an order degree of freedom beam structure failure probability is an important index, analysis of steel structural building materials strength and reliability. The building structure itself embodies the static and dynamic properties of materials, structure size, and the stochastic property are introduced. Considering the random property of the structural elements of buildings and single degree of freedom characteristics, construct the failure probability analysis of single degree of freedom model of steel beam structure, the structural members are uncertain reliability analysis under blast loading beams, analysis of steel member sizes in uncertain under explosion loading increased stress points,constructs the dynamic response of a steel beam force feedback model. The uncertainty of moderate damage function of steel structures under blast loads in beam under random property, building the analysis model of failure probability of single degree of freedom beam structure. Experiment shows, the displacement calculation of time history curves are in good agreement with the experimental curve, the probability of failure- the material and size of beam uncertainty and steel ratio distance curve is fitted, the model and the method in the study of failure probability has reliability of single degree of freedom beam under explosive loads.
出处
《科技通报》
北大核心
2015年第4期55-57,共3页
Bulletin of Science and Technology
关键词
构件
随机属性
钢梁结构
可靠性
component
stochastic property
steel structure
reliability
