Beskopylny Alexey, Meskhi Besarion, Kadomtseva Elena, Strelnikov Grigory
Department of Transport Systems, Faculty of Roads and Transport Systems, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia.
Department of Life safety and Environmental Protection, Faculty of Life Safety and Environmental Engineering, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia.
Materials (Basel). 2020 Mar 29;13(7):1579. doi: 10.3390/ma13071579.
This article is devoted to the stress-strain state (SSS) study of metal and reinforced fiber-reinforced concrete beam under static and shock loading, depending on the bimodularity of the material, the mass of the beam, and the location of the reinforcing bars in zones under tension and compression. It is known that many materials have different tensile and compression properties, but in most cases, this is not taken into account. The calculations were carried out by using load-bearing metal beams made of silumin and steel and reinforced concrete beams under the action of a concentrated force applied in the middle of the span. The impact load is considered as the plastic action of an absolutely rigid body on the elastic system, taking into account the hypothesis of proportionality of the dynamic and static characteristics of the stress-strain state of the body. The dependences of the maximum dynamic normal stresses on the number of locations of reinforcing bars in zones under tension and compression, the bimodularity of the material, and the reduced mass of the beam are obtained. A numerical study of SSS for metal and concrete beams has shown that bimodularity allows the prediction of beam deflections and normal stresses more accurately.
本文致力于研究金属和钢筋纤维增强混凝土梁在静载和冲击载荷作用下的应力应变状态（SSS），该状态取决于材料的双模量、梁的质量以及受拉和受压区域中钢筋的位置。众所周知，许多材料具有不同的拉伸和压缩特性，但在大多数情况下，这一点并未得到考虑。计算是通过使用由硅铝合金和钢制成的承重金属梁以及在跨中施加集中力作用下的钢筋混凝土梁来进行的。冲击载荷被视为绝对刚体对弹性系统的塑性作用，同时考虑了物体应力应变状态的动态和静态特性的比例假设。得出了最大动态正应力与受拉和受压区域中钢筋位置数量、材料的双模量以及梁的折合质量之间的关系。对金属梁和混凝土梁的应力应变状态进行的数值研究表明，双模量能够更准确地预测梁的挠度和正应力。
