铁道科学与工程学报2017，Vol.14Issue(11)：2427-2434,8.
落锤冲击下混凝土圆柱体动力效应数值模拟
Numerical simulation study on dynamic behavior of concrete cylinder under drop hammer impact loading
摘要
Abstract
In order to study the dynamic behavior of concrete under low velocity impact, a numerical simulation study was carried out on concrete cylinder specimens subjected to axial impact at the strain rate of 100/s to 101/s. Based on the stress and strain curves of concrete measured by self-developed stress gauge, the key parameters of continuous surface cap model (CSCM) were optimized. The impact force time histories and the variations of cylinder's stress, internal energy, erosion energy, strain rate, and dynamic increase factor (DIF) under various impact speeds were calculated. Meanwhile, the failure process was also captured. The simulation results show that the relationships between internal energy and impact velocity,erosion energy and impact velocity, hourglass energy and impact velocity are approximately linear, and that the curve of DIF shows a shape of parabola against the strain rate. The CSCM concrete constitutive model is shown to have a good precision in low-speed impact range after parameters are optimized, and the simulated failure modes also show a good consistency with the experimental results.关键词
混凝土/低速冲击/数值模拟/参数优选Key words
concrete/low velocity impact/numerical simulation/parameter optimization分类
建筑与水利引用本文复制引用
孟一,黄方林..落锤冲击下混凝土圆柱体动力效应数值模拟[J].铁道科学与工程学报,2017,14(11):2427-2434,8.基金项目
国家自然科学基金资助项目(51378504) （51378504）
中国博士后基金资助项目(2014M552156) （2014M552156）
