In order to study the behavior of reinforced concrete (RC)beams under impact loading,drop hammer tests were performed for 4 RC beams and test variables were impact mass and impact velocity.Impact force,reaction force and mid-span deflection were measured.The crack propagation was recorded using a high-speed video camera.The specimens revealed two different failure patterns of the beam-hammer contact zone.It was shown that with increase in impact velocity and decrease in impact mass,the proportion of the hammer kinetic energy to be converted into the beam's strain energy reduces,more energy is consumed for the local damage of the beam-hammer contact zone.Based on the statistical analysis of these tests'results and those of the tests conducted by previous researchers,an empirical formula to estimate the maximum deflection of RC beams was derived considering influence of impact mass and its accuracy was better than that of the empirical formula proposed by previous researchers.%为研究钢筋混凝土梁在冲击荷载作用下的性能，进行了4根钢筋混凝土梁的落锤冲击试验，试验变量为冲击质量和冲击速度。试验中量测了冲击力、支反力和跨中位移，并用高速摄像机记录了冲击过程中的裂缝发展。试验梁呈现了两种不同的梁锤接触区域破坏模式。随冲击速度提高和冲击质量减小，落锤动能转化为梁整体变形耗能的比例减小，更多能量消耗在梁锤接触区域的局部破坏上。通过对本次试验和前人试验结果的统计分析，提出了估算冲击荷载作用下梁体最大挠度的经验公式。公式中考虑了冲击体质量的影响，其准确度较先前研究者提出的经验公式有所提高。
展开▼
