Kinetic load bearing capacity of impulsively loaded reinforced concrete members. Tests on reinforced concrete beams. Pt. 1

The kinetic load bearing capacity of reinforced concrete beams has been evaluated in tests on 33 specimens. The R.C.-beams (3,20 m span, 25 cm width, 30 cm - 50 cm height) were simply supported and centrally loaded. In the test series were loaded identical specimens up to failure under static and under impact load (fracture of beams after 30 ms to 70 ms) as well. In the beams occured plastic hinges and they failed by fracture of the tensile reinforcement or by crushing of the concrete compression zone. The following parameters were varied: height of beams, type of reinforcement, amount of tensile and compression reinforcement, concrete compression strength, and load time history. It is recognized from the results, that only the mean value of the deformation rate characterizes the response of the specimens. This can be stated for the range of parameter values appearing in reinforced concrete structures subjected to aircraft crash and in the reported tests. In all tests occured ductile failure. The total deformation up to failure reached in dynamic tests at least the static values or exeeded those considerably. (orig.) With 153 figs