爆炸沖擊作用下混凝土橋梁結(jié)構(gòu)的動態(tài)響應(yīng)分析
[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.
【學(xué)位授予單位】:武漢科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U441
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