Testing and analysis of elastic-plastic pinned beams under impulsiveloading M.Boutros & M.Keys Department of Civil Engineering, University ofWestern Australia, Nedlands 6907, Australia Email: boutros@civil. uwa. edu. an Abstract An analytical model for the analysis of beams with pinned ends is presented. The deflection shape accounts for the stretching (membrane) force. The elastic- plastic beam is analysed under impulsive loading using the equation of motion derived by the virtual work principle. Elastic and plastic strain rate effects are considered as viscous damping. An apparatus to test beam specimens subjected to impulsive loading is presented. It comprises a moving carriage tended by springs. Mild steel specimens 400mm long and 10 to 20mm thick softened by annealing were tested. The comparisons of the analytical and experimental results show a good agreement. This model is also compared with the results of rigid-segment models. The comparisons show that it is important to consider elastic deformations in the analysis especially in cases of low levels of impulse producing permanent midspan deflections less than the thickness of the specimens. 1 Introduction Models for beams under impulsive loads were developed considering elastic-plastic systems of rigid body segments (e.g. Yankelevsky and Boymel^). Pinned beams develop an axial force proportional to the elastic elongation of the axis of the beam. When large plastic deformations develop under an impulse, the path of loading/deformation is of little effect on the total behaviour. However, in cases of small Transactions on the Built Environment vol 32, © 1998 WIT Press, www.witpress.com, ISSN 1743-3509
Testing and analysis of elastic-plastic pinned beams under impulsive loading
Jun 23, 2023
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
