钢筋混凝土梁冲击响应及其影响因素分析

为研究钢筋混凝土梁在集中冲击荷载作用下的动力响应,考虑梁截面高度、梁配筋率、接触面积、初始冲击速度和落锤质量等因素的影响,运用ABAQUS有限元分析软件对某固支梁进行非线性动力响应分析,并考虑了材料的应变率效应. 结果表明,冲击力峰值和梁的跨中最大位移受接触面积和初始冲击速度影响较大,一定程度上受到梁截面高度和配筋率的影响,而落锤质量对冲击力峰值的影响很小.

Analysis of Impact Response of RC Beams and Influencing Factors

To more accurately investigate the dynamic response of RC beams under concentrated impacts, the nonlinear dynamic response characteristics of a clamped beam were numerically simulated by the finite element analysis software ABAQUS with the consideration of the strain rate effects of concrete and steel bar and the influence factors such as the height of the beam section, the reinforcement ratio, the contact area, the impact velocity and mass of the hammer. The results show that the contact area and the impact velocity have evident influence on the impact load and the structural displacement, the height of the beam section and the reinforcement ratio have limited influence on the response, and the mass of the hammer has little influence on the impact loads.