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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第5期    总第297期    2019年5月

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文章编号:1672-7207(2019)05-1154-11
近爆冲击波和破片复合作用下预应力钢筋混凝土空心板梁的损伤效应分析
田力1, 2,李永欣1

(1.天津大学 建筑工程学院,天津,300072;
2. 天津大学 滨海土木工程结构与安全教育部重点实验室,天津,300072
)

摘 要: 通过数值分析研究预应力钢筋混凝土空心板梁在近爆冲击波和预制破片复合作用下的损伤情况。通过非线性有限元软件ANSYS/LS_DYNA模拟预应力混凝土板的爆炸试验和炸药驱动预制破片的试验,验证本文所采用的材料本构模型及技术路线的合理性与可靠性,研究爆炸波、破片荷载及二者复合作用下预应力空心板梁的动态响应的差异,同时运用参数化分析方法,研究张拉控制应力、预应力损失水平、混凝土强度、普通钢筋纵筋配筋率及箍筋间距对空心板梁动力响应的影响。研究结果表明:随着张拉控制应力增大,构件的抗爆性能显著增强;在相同张拉控制应力作用下,即使构件有不同水平的应力损失,其抗爆性能也基本相同;提高混凝土强度对构件的抗爆性能的提升作用并不明显;普通钢筋纵筋配筋率的提升在一定范围内可以小幅度提高构件的抗爆性能;随着箍筋间距增加,构件的抗爆性能明显减弱。

 

关键字: 预应力钢筋混凝土空心板梁;爆炸波;破片;复合作用;参数化分析

Analysis of damage effects of a prestressed reinforced concrete hollow beam subjected to the synergistic effects of blast and fragments
TIAN Li1, 2, LI Yongxin1

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China

Abstract:Numerical analysis was carried out to research the damage situations of prestressed reinforced concrete hollow beams under the synergistic effects of blast and fragments. Finite element software ANSYS/LS-DYNA was used to simulate the blast test of the prestressed concrete panel and the experiment of explosive driving prefabricated fragments. The reliability of the material constitutive models and technical route used in this paper was verified. The differences in the dynamic response of the hollow beam under the influences of blast wave, fragment load and both of them were analyzed. At the same time, parametric studies were carried out to investigate the effects of tensile control stress, level of stress loss, concrete strength, reinforcement ratio, and spacing of stirrups on dynamic response of the prestressed concrete hollow beam. The results show that with the increase of tensile control stress, the anti-explosion performance of the hollow beam increases. The anti-explosion performance of hollow beam is basically the same at the same tension control stress level, even if there are different levels of stress loss. The improvement of concrete strength on the anti-explosion performance is not significant. The increase of the reinforcement ratio improves the anti-explosion performance of hollow beam slightly within a certain range. With the increase of the spacing of stirrups, the anti-explosion performance of the component weakens obviously.

 

Key words: prestressed reinforced concrete hollow beam; blast; fragment; synergistic effects; parametric study

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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