Abstract
A response of concrete and reinforced concrete structures to very rapid dynamic loading shows an increase of both tensile and compressive strength. This behaviour is also accompanied by an increase of stiffness of the structure. Described response can be numerically simulated only with adequate viscous nonlinear material model of concrete. The problem of these simulations is based not only on a necessity of a derivation of the right material model but also on viscous parameters whose values are not known in advance. The proposed article deals with experimental research of the response of the reinforced concrete beam exposed to impact loading during drop test. The beam response was measured with conventional strain gauges and accelerometers and whole experiment was recorded with 1000 frames per second by slow motion camera. Measured values of vertical acceleration were then compared with results of software analysis of slow-motion video footage. The paper contains the description of the experimental research, the comparison of conventional measurements with video analysis and the simulated response of the specimen in the software based on the finite element method using the viscous material model of concrete.
Highlights
Capabilities of today’s computers and computational software allow engineers to solve very complex problems with high amount of accuracy in relatively short period of time. Typical example of this situation is the nonlinear simulation of impact loading of civil structures using finite element method
The nonlinear simulation offers engineers quite cheap advantage to design the structure compared with full scale experiment if they are ever feasible
In case of concrete civil structures, the response of concrete to rapid dynamic loading shows an increase of both tensile and compressive strength which implies the use of adequate viscous nonlinear material
Summary
Capabilities of today’s computers and computational software allow engineers to solve very complex problems with high amount of accuracy in relatively short period of time. From this point of view it is necessary to step back and prepare suitable laboratory or field experiment that can provide values of unknown parameters Example of such numerical analysis was published in [1] where design of a concrete road safety barrier had been solved using finite element computational system LS-Dyna [2]. Another example is represented by paper from Němec et al [3] which deals with nuclear power plant containment damage caused by impact of a plane. The article deals with description of test configuration, used measuring techniques and last but not least with image processing analysis of footage captured with slow-motion camera which had provided valuable information about the behaviour of the beam
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