摘要
通过分析钢筋混凝土梁在低速冲击下的应力状态和变形破坏多阶段的性状,建立了冲击体与梁局部与整体相互作用的刚性离散模型,推导了钢筋混凝土梁各构件在不同阶段的变形刚度,利用拉格朗日方程导出了弹性与塑性阶段的运动方程。分析表明:在低速冲击荷载作用下梁的变形与其动力特性、冲击体与梁的质量比Ms/Mb,冲击速度V0、冲击时间和冲击体形状密切相关。在足够宽的Ms/Mb、V0的变化范围内,钢筋混凝土梁呈现出一致的状态特性。
A rigid discretized model of the local and global interaction between an impact body and a beam is built by analyzing the stain state and multistage deformation characteristies of a reinforced concrete beam under low velocity impact,and the deformation stiffnesses of all parts of the reinforced concrete beam in different stage are deduced,and its motion equations in the elastic and plastic stage are obtained by use of Lagrange equation.The analysis shows that the beam deformation is related to its dynamic behavior,the mass ratio of the impact body to the beam M_s/M_b,impact velocity v_0,impact time and the shape of the impact body.The beam shows the similar state in enough large range of M_s/M_b and v_0.
出处
《振动与冲击》
EI
CSCD
北大核心
2007年第5期99-103,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(50578158)
关键词
钢筋混凝土梁
低速冲击
局部与整体变形
reinforced concrete beam,low velocity impact,local and global deformation
