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Three‐point bending tests on notched plain concrete beams and lightly reinforced concrete beams were carried out with a drop‐hammer impact instrument. The shape of the specimen followed the RILEM recommendation, that is, 150 mm × 150 mm in cross section, 800 mm in length, and span was kept constant 600 mm. And only one conventional steel bar was placed in the lightly reinforced concrete beam. The...