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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。
Due to the limitations of the test methods, various dynamic responses and energy absorption characteristics of the flexible shed under the impact of rockfall can not be tested through the test. Therefore, the numerical simulation of the flexible shed under the impact of rockfall is carried out. Based on experimental conclusion, theoretical analysis and reasonable assumptions, a numerical model of flexible shed is established. In order to verify the reliability of the numerical model and the numerical method, the influence of the rockfalling time, the descending displacement of the ring net, the maximum load on the transverse cables and the circumferential support ropes, the deformation characteristics of the flexible shed and the time history curve of the steel arch The results show that the numerical models and numerical methods adopted in this paper can predict various dynamic response characteristics of flexible shed under the impact of rockfall. In-depth study provides a reliable method.