爆炸冲击作用下混凝土桥梁结构的动态响应分析
发布时间：2018-11-05 12:00
【摘要】：近年来针对桥梁结构的恐怖袭击和生产生活中的意外爆炸事故，严重影响了桥梁的正常使用和人民的生命财产安全。由于结构抗爆研究的特殊性及复杂性，桥梁设计规范中尚未考虑爆炸冲击力对桥梁结构的影响以及对应的防护措施，而且当前针对爆炸荷载对桥梁结构作用效应的研究大部分集中在基本理论和数值模拟上，缺乏必要的试验研究，因此，开展爆炸试验并结合数值模拟深入研究爆炸冲击作用下桥梁结构的动态响应及损毁效应成为桥梁工程领域中的新兴课题。 本文基于爆炸基本理论，设计制作了混凝土简支T梁模型，并对其进行了不同爆炸高度和炸药药量组合下的爆炸试验研究。试验中采用混凝土超声波检测技术探测混凝土内部损伤程度，采用优泰动态测试系统采集了翼缘板和梁肋位置的加速度和应变，在此基础上分析了简支T梁模型在不同爆炸高度和不同炸药量下的动态响应。同时应用ANSYS/LS-DYNA软件仿真分析了T梁模型的动态响应，并与试验结果进行了对比分析。研究结果表明，爆炸冲击荷载下翼缘板比其它部位更容易损毁，结构的动态响应对爆炸高度更敏感。
[Abstract]:In recent years, the terrorist attacks on bridge structures and accidental explosions in production and life have seriously affected the normal use of bridges and the safety of people's lives and property. Because of the particularity and complexity of anti-explosion research of structure, the influence of blast force on bridge structure and the corresponding protective measures have not been considered in the design code of bridge. Moreover, the current research on the effect of explosion load on bridge structure is mostly focused on the basic theory and numerical simulation, which is lack of necessary experimental research. It is a new topic in the field of bridge engineering to carry out explosion test and to study the dynamic response and damage effect of bridge structure under explosion shock combined with numerical simulation. Based on the basic theory of explosion, the model of simply supported concrete T-beam is designed and made in this paper, and the explosion test under different explosion height and explosive charge is carried out. In the test, the concrete ultrasonic detection technology is used to detect the damage degree of concrete, and the acceleration and strain of flange plate and beam rib are collected by using the Yutai dynamic testing system. On this basis, the dynamic response of simply supported T-beam model under different explosion heights and explosive quantities is analyzed. At the same time, the dynamic response of the T-beam model is simulated by ANSYS/LS-DYNA software, and compared with the experimental results. The results show that the flange plate is more easily damaged than other parts under blast impact load, and the dynamic response of the structure is more sensitive to the explosion height.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441
本文编号：2312022
[Abstract]:In recent years, the terrorist attacks on bridge structures and accidental explosions in production and life have seriously affected the normal use of bridges and the safety of people's lives and property. Because of the particularity and complexity of anti-explosion research of structure, the influence of blast force on bridge structure and the corresponding protective measures have not been considered in the design code of bridge. Moreover, the current research on the effect of explosion load on bridge structure is mostly focused on the basic theory and numerical simulation, which is lack of necessary experimental research. It is a new topic in the field of bridge engineering to carry out explosion test and to study the dynamic response and damage effect of bridge structure under explosion shock combined with numerical simulation. Based on the basic theory of explosion, the model of simply supported concrete T-beam is designed and made in this paper, and the explosion test under different explosion height and explosive charge is carried out. In the test, the concrete ultrasonic detection technology is used to detect the damage degree of concrete, and the acceleration and strain of flange plate and beam rib are collected by using the Yutai dynamic testing system. On this basis, the dynamic response of simply supported T-beam model under different explosion heights and explosive quantities is analyzed. At the same time, the dynamic response of the T-beam model is simulated by ANSYS/LS-DYNA software, and compared with the experimental results. The results show that the flange plate is more easily damaged than other parts under blast impact load, and the dynamic response of the structure is more sensitive to the explosion height.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441
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