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采用落锤撞击试验装置,进行了8根钢筋混凝土梁的撞击试验。对比分析了设置缓冲装置前后试件撞击动力响应的变化。试验结果表明:设置有缓冲装置的试件动力响应有大幅度降低,受弯作用的梁撞击峰值力可降低70.98%,撞击点背面纵筋峰值应变可降低71.11%;受剪作用的梁撞击峰值力可降低76.24%,撞击点背面纵筋峰值应变可降低83.09%,箍筋峰值应变可降低84.65%,这对研究高效的抗撞综合体系具有试验参考价值。运用能量守恒原理和动量定理,建立了设置缓冲装置后作用于简支梁的撞击力计算公式。撞击力计算值与试验撞击力峰值吻合较好,这为撞击缓冲效应的理论计算提供了具有试验依据的简捷方法。
The impact test of 8 reinforced concrete beams was carried out by using drop hammer impact test device. The changes of the dynamic response of the specimen before and after the setting of the buffer device were compared and analyzed. The experimental results show that the dynamic response of the specimen with the buffer device is greatly reduced, the beam impact peak bending force can be reduced by 70.98% and the peak longitudinal strain at the impact point can be reduced by 71.11%; the beam impact peak The force can be reduced by 76.24%, the peak strain of the longitudinal reinforcement on the back of the impact point can be reduced by 83.09%, and the peak strain of the stirrup can be reduced by 84.65%, which has the experimental reference value for the research of a highly effective integrated system of impact resistance. By using the principle of conservation of energy and the momentum theorem, the formula for calculating the impact force acting on a simply supported beam after setting up the buffer device is established. The calculated value of the impact force is in good agreement with the peak value of the test impact force, which provides a simple and experimental method for the theoretical calculation of the impact buffer effect.