钢筋混凝土柱式墩落石冲击抗剪性能可靠性分析

发布时间：2018-04-12 21:17

本文选题：钢筋混凝土柱式墩 + 落石　；参考：《振动与冲击》2017年07期

【摘要】：建立一种基于可靠度理论的落石冲击作用下钢筋混凝土柱式桥墩抗剪性能可靠性分析方法。在数值分析方法可靠性验证基础上通过非线性有限元分析生成了60组落石-墩柱接触力时间过程数值样本,考虑等冲量和等峰值建立落石撞击荷载的简化半波正弦模型;以Priestley公式描述墩柱抗剪能力,以剪力破坏参数定义墩柱损伤等级,通过蒙特卡洛随机抽样得到各撞击强度下结构失效概率,进而得到易损性曲线,进行了落石质量、撞击速度、墩柱截面面积、混凝土轴心抗压强度和箍筋配筋率参数敏感性分析。结果表明,数值模型参数能够有效模拟钢筋混凝土构件落石冲击响应;相比于全局平均等效静力,峰值等效静力方法更适用于落石冲击荷载等效静力简化;落石质量和撞击速度增加不同程度增加墩柱抗剪失效概率,混凝土轴心抗压强度提高、墩柱截面面积增加和箍筋加密一定程度上降低墩柱各个等级损伤发生概率。
[Abstract]:Based on reliability theory, a reliability analysis method for shear performance of reinforced concrete column pier under rock drop impact is established.On the basis of reliability verification of numerical analysis method, 60 groups of numerical samples of contact time process of falling stone and pier column were generated by nonlinear finite element analysis, and a simplified half-wave sinusoidal model was established considering equal impulse and equal peak value.The shear resistance of pier column is described by Priestley formula, the damage grade of pier column is defined by shear failure parameter, the failure probability of structure under each impact strength is obtained by Monte Carlo random sampling, and the vulnerable curve is obtained, and the falling rock mass and impact velocity are obtained.Sensitivity analysis of parameters such as section area of pier column, axial compressive strength of concrete and reinforcement ratio of stirrups.The results show that the numerical model parameters can effectively simulate the rockfall impact response of reinforced concrete members, and the peak equivalent static method is more suitable for simplifying the equivalent static load than the global average equivalent static force.With the increase of falling mass and impact velocity, the failure probability of shear resistance of pier column is increased, the compressive strength of concrete axis is increased, the cross section area of pier column is increased, and the probability of damage occurrence of each grade of pier column is reduced to a certain extent by adding stirrups.
【作者单位】：同济大学桥梁工程系;
【基金】：国家自然科学基金项目(51378383) 浙江省科技计划项目(2016C33202)
【分类号】：TU375.3

【相似文献】