On random elastic constraint conditions of Levinson beam model considering the violation of Saint-Venant’s principle in dynamicBin Xiao, Ze-xi Sun, Shuang-xia Shi, Chao Gao and Quan-chi LuEur. Phys. J. Plus, 135 2 (2020) 168DOI: https://doi.org/10.1140/epjp/s13360-020-00197-y