落石冲击作用下不同连接方式被动防护网的受力分析

发布时间：2018-04-20 18:20

本文选题：被动防护网 + 落石冲击　；参考：《中国铁道科学》2016年02期

【摘要】：以常用的RX-025型被动防护网为原型,考虑材料非线性、几何非线性及摩擦接触等因素,运用ANSYS软件,建立钢柱与钢丝绳网及钢柱与基础采用不同连接方式的被动防护网结构模型,进行不同落石冲击能量作用下不同连接方式被动防护网的受力性能研究。结果表明:上下支撑绳对钢丝绳网的垂直变形影响很大;在相同落石冲击能量作用下,钢柱与钢丝绳网仅在柱顶和柱脚处连接(两点连接)时,结构的变形比多点连接明显,结构受到的最大冲击荷载、拉锚绳及支撑绳的受力更小,耗能能力更好;钢柱与基础间铰接连接时可显著降低钢柱轴力,提高被动防护网结构的防护能级;建议被动防护网的钢柱与钢丝绳网间优先采用两点连接,钢柱与基础间优先采用铰接连接。
[Abstract]:Taking RX-025 type passive protective net as prototype, considering the factors of material nonlinearity, geometric nonlinearity and friction contact, and using ANSYS software, the passive protective net structure model of steel column and wire rope net and steel column and foundation with different connection mode is established. The mechanical behavior of passive protective net with different connection mode under different impact energy was studied. The results show that the vertical deformation of the wire rope mesh is greatly affected by the upper and lower support ropes, and the deformation of the structure is more obvious than that of the multi-point connection when the steel column and the wire rope net are connected only at the top of the column and the foot of the column (two points) under the same impact energy. Under the maximum impact load, the force of anchor rope and support rope is smaller and the energy dissipation ability is better, the axial force of steel column can be significantly reduced when the steel column is hinged with foundation, and the protective energy level of passive protective net structure can be improved. It is suggested that two-point connection is preferred between steel column and wire rope net and hinge connection between steel column and foundation is preferred.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51278428,51408498) 中央高校基本科研业务费专项资金资助项目(2682014CX066)
【分类号】：TU356

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