基于動(dòng)力特性的某在役PC橋梁健全性評(píng)估
[Abstract]:Bridge is the hub and lifeline of transportation and plays a vital role in the development of social economy. However, due to the influence of various factors during the service life of the bridge, the damage and deterioration will occur in varying degrees. Among the many damage identification methods for bridges, the damage identification method based on the dynamic characteristics of structures is the best macro marker to characterize the overall state of the structure. Previous studies have shown that the method of field dynamic load test and numerical analysis can be used to evaluate the soundness of rigid frame bridge. At present, there are few researches on the evaluation of the bridge health of prestressed concrete (Pre-stressed concrete,) bridge with this method. In this paper, the dynamic characteristics of PC continuous beam bridge are measured by field dynamic load test. In the dynamic load test, 42 high sensitivity servo accelerometers and WLAN vibration system are used to measure the vibration acceleration of the bridge. The test is carried out in the closed traffic environment. At the same time, the PC bridge is numerically analyzed. Through the combination of field dynamic load test and numerical analysis, the damage identification of PC bridge based on frequency change and mode change is carried out, and then the bridge's health is evaluated, and the reference is provided for the same type of bridge's soundness assessment at the same time. The main research contents are as follows: (1) the dynamic characteristics of PC continuous bridge are measured by ambient vibration test. The results show that the natural vibration frequency and vibration mode of the bridge can be measured by the vibration test under environmental excitation. In this paper, the vibration modes obtained from the field dynamic load test of the bridge are compared with those obtained by the finite element numerical analysis. By comparison, it can be seen that the field dynamic load test of PC bridge is carried out by using the excitation mode of large vehicle passing, and the dynamic characteristics of the bridge are accurately reflected in a very small range. (3) the dynamic load test and the numerical analysis of the natural vibration frequency are compared. The frequency measured by the dynamic load test is different from the frequency obtained by the finite element analysis, which may be due to the reinforcement bar being used in the finite element analysis. Comparison of the natural vibration frequencies between the initial construction of the bridge and 50 years after use. The natural vibration frequency of the bridge structure decreases after 50 years of service. To a large extent, it is due to the influence of the addition of sidewalks; the deterioration of materials in the process of bridge use is the second; finally, the measurement accuracy of vibration test in the initial stage of bridge construction is also affected to a certain extent.
【學(xué)位授予單位】:河南理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U446
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