轴向冲击载荷下帽形截面梁加强板设计研究
Study on Design of Stiffening Plate of Hat-section Beam Under Axial Loading

为了提高帽形截面梁在轴向冲击载荷作用下的吸能特性，利用超单元理论，结合动态落锤试验，对加强板设计进行研究，从变形形式、压溃力曲线和压溃结果特征值三方面，对多胞结构进行了优势验证和对加强板的结构进行了探讨，对受到轴向冲击载荷的帽形截面梁中加强板的设计提出了一系列的建议。加强板的设计应适量在帽型梁截面较为薄弱的地方增加方形胞元的个数，可以使截面超单元的数量增加，超单元边长缩小，从而减小褶皱半波长。本文提出的方法有利于提高帽形截面梁吸能效率，有效改善结构的变形稳定性。
In order to improve the energy absorption characteristics of the hat-section beam under axial impact load, the design of stiffening plate is studied by using super-element theory and the experiments of dynamic testing rig. From the deformation pattern, crushing force curve and characteristic value of crushing, the advantages of multi-cellular structures have been proved and the structural design of the stiffening plate has been explored. A series of strategies for structural design of stiffening plate of hat-section beam under axial loading are proposed. The stiffening plate should be used to increase the amount of square unit cells, which should be set in the weak area in the hat-section beam so as to decrease the half wavelength of the holds by increasing the number of the super-folding element and decreasing its side-length. The present method will improve the energy absorption characteristics of the hat-section beam and increase the stability of the structure deformation