墩顶水平冲击作用下承插式桥墩动力响应研究
Dynamic response of socket piers under horizontal impact at pier top
- 铁道科学与工程学报 2023年20卷第11期 页码：4221-4232
- 作者机构：
1.中南大学 土木工程学院，湖南 长沙 410075
2.中南大学 高速铁路建造技术国家工程研究中心，湖南 长沙 410075
- 作者简介：
孟栋梁(1991—)，男，安徽合肥人，博士，从事桥梁抗震研究；E-mail：mengdl@csu.edu.cn
- 基金信息：国家自然科学基金资助项目(52308224;52278232);中国博士后创新人才支持计划(BX20230429);中国博士后面上项目(2023M733970)
DOI：10.19713/j.cnki.43-1423/u.T20222218
中图分类号：
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杨孟刚,李滨宏,孟栋梁.墩顶水平冲击作用下承插式桥墩动力响应研究[J].铁道科学与工程学报,2023,20(11):4221-4232.
YANG Menggang,LI Binhong,MENG Dongliang.Dynamic response of socket piers under horizontal impact at pier top[J].Journal of Railway Science and Engineering,2023,20(11):4221-4232.
杨孟刚,李滨宏,孟栋梁.墩顶水平冲击作用下承插式桥墩动力响应研究[J].铁道科学与工程学报,2023,20(11):4221-4232. DOI： 10.19713/j.cnki.43-1423/u.T20222218.
YANG Menggang,LI Binhong,MENG Dongliang.Dynamic response of socket piers under horizontal impact at pier top[J].Journal of Railway Science and Engineering,2023,20(11):4221-4232. DOI： 10.19713/j.cnki.43-1423/u.T20222218.
摘要
为研究墩顶水平冲击作用下承插式预制桥墩的动力行为，对一承插式构件进行冲击试验。基于ANSYS/LS-DYNA对冲击试验进行有限元模拟，并通过试验结果验证了有限元模型的精确性。在此基础上，通过数值模拟的方法分析冲击作用下承插式桥墩的内力(剪力和弯矩)变化规律和损伤机理，并探讨了冲击质量、冲击速度、承插深度以及接缝强度对桥墩动力响应的影响。结果表明：在初始接触阶段，桥墩的截面剪力和弯矩时程曲线出现明显振荡；相较于墩身顶部，墩身底部截面剪力和弯矩响应峰值出现具有滞后性。在墩顶位移峰值时刻，构件内力分布规律与在静载作用下的结果类似，即剪力沿墩身(不包含桥墩承插部分)呈矩形分布，弯矩近似呈三角形分布；在冲击荷载作用下，承插式桥墩的最大弯矩出现于墩身底部，而最大剪力截面位于桥墩承插段，构件的损伤主要表现为墩身底部的弯曲损伤和承插段的弯剪损伤。随冲击质量和冲击速度的增加，冲击力、构件的剪力、弯矩和塑性变形响应均有所增大；相比冲击质量而言，冲击速度对冲击力峰值的影响更为显著。增加承插深度以及接缝强度可提高构件刚度，从而减小桥墩的水平位移，但会增大构件弯矩响应。研究成果可为承插式桥墩的抗冲击设计提供参考。
Abstract
To investigate the dynamic behavior of socket precast piers under horizontal impact at pier top, an impact test on a socket specimen was conducted. A finite element model was established using software ANSYS/LS-DYNA and validated by the experimental results. On the basis, the transmission of the internal forces (shear force and bending moment) and damage mechanism of the socket pier under impact load were analyzed. The effects of impact mass, impact velocity, socket depth and joint strength on the dynamic response of the socket pier were discussed. The results indicate that in the initial contact stage, obvious vibration can be found in the time histories of shear force and bending moment of the pier. The maximum internal forces at the socket pier bottom would appear later compared to those at the pier top. When the pier-top displacement reaches the maximum value, the distribution of the internal forces alone the pier (excluding the socket part) due to impact load is very similar to that due to static load, i.e., the shear force and bending moment are distributed in a rectangular shape and a triangular shape along the pier, respectively. Under the impact load, the maximum bending moment appears at the bottom cross-section of the pier (excluding the socket part), while the maximum shear force appears in the socket part. Consequently, damage to the socket pier is manifested as the bending damage at the pier bottom and the bending-shear damage in the socket part. Increasing the impact mass and velocity will lead to a larger impact force and thus a larger shear force, bending moment and plastic deformation of the socket pier. Impact velocity has a more significant effect on the generated maximum impact force than impact mass. Increasing socket depth and joint strength will increase the pier stiffness, resulting in a smaller displacement but a larger bending moment of the socket pier. The research results can provide a reference for the design of socket piers due to impact load.
关键词
承插式桥墩墩顶水平冲击作用试验研究有限元模拟动力响应
Keywords
socket pierhorizontal impact at pier topexperimental researchfinite element simulationdynamic response
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