考虑剪切效应的混凝土桥墩撞击动态力学特性研究

发布时间：2018-01-09 23:14

本文关键词：考虑剪切效应的混凝土桥墩撞击动态力学特性研究　出处：《公路工程》2017年04期 　论文类型：期刊论文

更多相关文章： 桥梁工程 桥墩 剪切变形 撞击 动力响应

【摘要】：为研究桥墩撞击剪切动力响应问题,基于Hamilton原理,将剪切变形引入碰撞体系偏微分方程中,考虑材料的动态力学性能,通过Laplace变换和Matlab软件求解,建立了考虑剪切效应的钢筋混凝土和钢骨混凝土桥墩动态剪力方程和动态弯矩方程,揭示了桥墩撞击动力响应受剪切效应影响的力学特征。理论计算和试验结果对比表明:剪切变形对桥墩试件峰值弯矩和峰值主拉应力的平均影响分别为8.82%和18.83%,剪切效应对桥墩撞击动力响应的影响较大,不可忽略。在桥墩抗撞强度设计中,不仅需要验算桥墩最大弯矩截面的拉应力,还应验算墩底的主拉应力,以体现剪切效应对桥墩撞击剪切破坏的影响,保证桥墩结构的安全。
[Abstract]:In order to study the dynamic response of pier to impact shear, based on Hamilton principle, shear deformation is introduced into the partial differential equation of impact system, and the dynamic mechanical properties of materials are considered. The dynamic shear equation and dynamic moment equation of reinforced concrete and steel reinforced concrete pier are established by Laplace transform and Matlab software. The mechanical characteristics of the impact dynamic response of piers affected by shear effect are revealed. The comparison between theoretical calculation and experimental results shows that:. The average effect of shear deformation on the peak bending moment and the peak principal tensile stress of the pier specimen is 8.82% and 18.83% respectively. The shear effect has a great influence on the impact dynamic response of the pier, which can not be ignored. In the design of the impact strength of the pier, it is necessary not only to check the tensile stress of the maximum moment section of the pier, but also to calculate the main tensile stress at the bottom of the pier. In order to reflect the effect of shear effect on the impact shear failure of pier, the safety of pier structure is ensured.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金资助(51278243)
【分类号】：U441
【正文快照】： 0前言近年来,车船撞击桥墩的事故频繁发生,造成了巨大的经济损失和社会影响,桥墩在冲击荷载下的动力响应及破坏与在静载下的行为有很大的不同,引起了许多学者的高度重视[1-3],然而,目前车船撞击桥墩动响应的研究中大都仅仅考虑了弯曲变形,考虑剪切变形的较少,认为剪切变形相对

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