低速冲击下钢筋混凝土深梁抗冲击性能及其损伤评估

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (2): 113-121.

低速冲击下钢筋混凝土深梁抗冲击性能及其损伤评估

项长生^*1,2, 孙伟¹, 周宇³

1.兰州理工大学土木工程学院, 甘肃兰州 730050;
2.兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050;
3.安徽建筑大学土木工程学院, 安徽合肥 230601

收稿日期:2019-12-11 出版日期:2021-04-28 发布日期:2021-05-11
通讯作者: 项长生(1976-),男,安徽安庆人,硕士,副教授.Email:xiangcs@lut.edu.cn
基金资助:
国家自然科学基金(51868045)

Impact resistance and damage evaluation of reinforced concrete deep beam under low velocity impact

XIANG Chang-sheng^1,2, SUN Wei¹, ZHOU Yu³

1. College of Civil Engineering, Lanzhou Univ. ofTech., Lanzhou 730050, China;
2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China

Received:2019-12-11 Online:2021-04-28 Published:2021-05-11

摘要/Abstract

摘要： 为研究钢筋混凝土深梁在低速冲击下的抗冲击性能和损伤机理,采用有限元软件ANSYS/LS-DYNA对不同冲击速度下深梁动力响应进行模拟.分析深梁的动态损伤过程及横截面的损伤分布,采用截面损伤因子对钢筋混凝土深梁的损伤程度进行定量评估;进一步分析边界条件、冲击位置对深梁抗冲击性能和损伤的影响.分析结果表明:建立的模型可以合理模拟低速冲击下深梁的动力响应;低速冲击下深梁先在局部范围内形成损伤,再向整体扩展,在回弹变形阶段冲击位置处局部损伤二次增大;冲击速度对深梁冲击位置附近的截面损伤程度影响显著;增强边界约束条件,能够提高低速冲击下深梁承载力,降低损伤程度;冲击位置对深梁的竖向变形和破坏位置有明显影响,但对损失程度影响轻微.

关键词: 钢筋混凝土深梁, 低速冲击, 损伤评估, 边界条件, 冲击位置

Abstract: In order to study the impact resistance and damage mechanism of reinforced concrete deep beams under low-speed impact, the structural response of deep beams at different impact speeds was simulated by finite element software ANSYS/LS-DYNA. The dynamic damage process and the damage distribution of the cross section of the deep beam were analyzed, and the damage of it was quantitatively evaluated by the section damage factor. The influence of boundary conditions and impact position on the impact resistance and damage of deep beams were further analyzed. The analysis results show that the model established is capable of simulating the dynamic response of deep beams under low-speed impact reasonably, under which circumstance, the damage is formed in local area firstly, and then, it expands to the whole structure, the local damage increases again at the impact position ultimately. The impact velocity has a significant influence on the local damage degree at the impact position. Strengthening boundary conditions can improve the bearing capacity of deep beams under low-speed impact and reduce damage degree. The impact position has a significant impact on the vertical deformation and damage position of the deep beam, while it has little influence on the damage degree.

Key words: reinforced concrete deep beam, low velocity impact, damage evaluation, boundary condition, impact location

中图分类号:

TU375.1

项长生, 孙伟, 周宇. 低速冲击下钢筋混凝土深梁抗冲击性能及其损伤评估[J]. 兰州理工大学学报, 2021, 47(2): 113-121.

XIANG Chang-sheng, SUN Wei, ZHOU Yu. Impact resistance and damage evaluation of reinforced concrete deep beam under low velocity impact[J]. Journal of Lanzhou University of Technology, 2021, 47(2): 113-121.

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