爆炸荷载统计模型下重力坝动力响应随机分析

发布时间：2018-03-26 11:30

本文选题：混凝土重力坝　切入点：爆炸荷载　出处：《中国安全科学学报》2017年06期

【摘要】：为准确预测混凝土重力坝结构在爆炸荷载作用下的动力响应特征,确定其概率意义上合理的防爆距离,提出基于爆炸荷载统计模型的重力坝结构动力响应随机性分析方法。首先,在已有爆炸荷载公式、计算图表和相关试验统计数据的基础上,建立空中爆炸荷载统计模型。同时,构建国内某混凝土重力坝的非溢流坝段的炸药-空气-坝体-地基的有限元耦合模型。然后,在考虑爆炸荷载的不确定性情况下,运用动力学显式算法分析坝体结构的不确定性动力响应特征。最后,采用统计学分析方法研究坝体动响应量最值的概率分布特征及损伤状态随比例爆炸距离的变化。结果表明,结构爆炸动力峰值响应量大致服从正态分布,在重力坝结构的抗爆防护设计中应合理考虑爆炸荷载变异性的影响。
[Abstract]:In order to accurately predict the dynamic response characteristics of concrete gravity dam structure under explosion load, the reasonable explosion-proof distance is determined in the sense of probability. Based on the statistical model of explosion load, a stochastic analysis method of dynamic response of gravity dam structure is proposed. Firstly, based on the existing formula of explosion load, the calculation chart and the statistical data of relevant test, the statistical model of aerial explosion load is established. The finite element coupling model of dynamite, air, dam body and foundation of a non-spillway dam section of a concrete gravity dam in China is constructed. The dynamic explicit algorithm is used to analyze the uncertain dynamic response characteristics of the dam structure. Finally, the probability distribution characteristics of the maximum value of the dynamic response of the dam and the variation of the damage state with the proportional explosion distance are studied by the statistical analysis method. The peak response of structure explosion is approximately normal distribution and the influence of explosion load variability should be considered reasonably in the design of anti-explosion protection of gravity dam structure.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津大学建筑工程学院;天津大学国有资产与设备管理处网络与多媒体教育技术中心;
【基金】：国家自然科学基金青年基金资助(51509182)
【分类号】：TV312;TV64

【相似文献】