摘要
由于试验测试手段的限制,通过试验无法测试得到柔性棚洞在落石冲击作用下的各种动力响应及能量吸收特性,为此开展了柔性棚洞在落石冲击作用下的数值模拟研究。基于试验结论、理论分析和合理假设的基础上,建立了柔性棚洞的数值模型。为验证数值模型及数值计算方法的可靠性,从落石冲击作用时间、环形网下降的位移、横向拉索和环向支撑绳上最大荷载、柔性棚洞的变形特征以及钢拱架应变时程曲线5个方面,对数值计算结果和试验结果进行了对比研究,结果表明:所采用的数值模型和数值计算方法能够较好地预测柔性棚洞在落石冲击作用下的各种动力响应特性,为后续深入研究提供了可靠的方法。
Because field tests could not be used to obtain energy absorption in individual components and support system reactions due to restrictions on testing methods, a numerical simulation of a flexible rock-shed under impact of rockfall was carried out. The numerical simulation model for the flexible rock-shed was developed based on reasonable assumptions, theoretical analysis and experimental results. In order to validate the numerical model and numerical calculation method, the numerical simulation results were compared with the experimental data from during the impact of the rockfall, including the displacement of ring nets, the peak load on horizontal and hoop cables, the deformation of the rock-shed, and the strain-time curves of the steel vaulted structure. The results show that the numerical model and numerical calculation methods are shown to be reliable in predicting the dynamic behavior of this rock-shed under rockfall impact, and will be employed to investigate the performance of this structure.
出处
《工程力学》
EI
CSCD
北大核心
2014年第5期151-157,共7页
Engineering Mechanics
基金
国家科技支撑计划课题项目(2012BAK05B02)
重庆市自然科学基金项目(cstc2012jjB30004
cstc2012jjA30005)
关键词
柔性棚洞
落石
耗能
冲击
数值分析
flexible rock-shed
rockfall
dissipation energy
impact
numerical simulation
