乏燃料容器撞击对减振层结构水平动力响应研究

Study on horizontal dynamic response of engineering structures with buffer-layer under impact action of fuel container

乏燃料容器在卸料厂房内运输过程中有可能脱钩坠落撞击厂房结构,国际上核电厂建设工程安全标准中均需考虑到乏燃料容器万一脱钩坠落时,应保证厂房结构及其他核设施的安全,使相邻贮存水池结构的水平动力加速度必须控制在0.8g内.本文在秦山核电站燃料厂房乏燃料容器撞击下减振层试验研究的基础上,采用有限元数值方法对试验结构建立了计算模型进行研究分析.研究中把乏燃料容器对结构的撞击作用转化为一个与撞击接触时间有关的等腰三角形冲量荷载,对减振层结构在不同布置情况下分别进行了试验和计算分析,通过对结果的比较,得到结构底板水平动力加速度最大值与撞击接触时间的二次方成反比的关系和计算结构动力响应的计算撞击接触时间,进一步提出了如何模拟计算在冲击荷载作用下通过减振层消振作用后结构底板水平动力加速度响应的方法,为以后类似问题的分析提供了一整套比较实用的研究思路.

There are some security requirements regarding the fuel container in the nuclear power plant, because during transport, the container could accidentally fall from the hook and impact on the nuclear engineering structures. The criterion of security is that the horizontal dynamic accelerations of the adjacent structure must be less than 0.8 g under the impact of the fuel container. Based on experiments on the impact of the gas entraining concrete block buffer layer on the fuel container as discussed at the fuel workshop in the Qinshan Nuclear Power Plant, finite element models of the structure were constructed for the numerical analysis. The impact of the fuel container may be transformed into an isosceles triangle impulse load about the contact time. The horizontal dynamic responses of the concrete bottom slab under different buffer-layer constructions were measured by analogous model experiments and calculated by finite element technique respectively. An important conclusion obtained was that the maximum value of the horizontal dynamic accelerations of the concrete bottom slab was inversely proportion to the square of the contact time. The exact impact contact time was obtained by the comparison between computation results and experimental data. A new approach which may be used to simulate and calculate the horizontal dynamic responses of engineering structures with buffer-layer is presented in this paper. Similar projects can also be analyzed by using this approach.