在役斜拉橋時(shí)效風(fēng)險(xiǎn)分析
[Abstract]:During the bridge operation, in addition to bearing all kinds of design loads, it also faces the influence of time-related uncertainties such as environmental erosion, over-designed traffic and overloading vehicles, material aging and so on, which will lead to the gradual degradation of structural resistance. It may further lead to security risks. In the event of an accident, it is possible not only to cause safety losses, but also to bring about significant economic losses. If the bridge disease can be predicted accurately and the maintenance measures can be taken in advance, not only the catastrophic loss can be avoided, but also the major repair and construction will be avoided. This will undoubtedly achieve the best effect in safety and economy. Therefore, it is of great theoretical and practical value to correctly predict the risk status of bridge operation period. This paper studies the time-effect risk of cable-stayed bridge in service from the angle of risk analysis, resistance degradation and so on. The main contents are summarized as follows: 1) the concept of limitation risk and the theoretical framework of limitation risk analysis of cable-stayed bridge in service are put forward, and its basic analysis process is given. 2) based on the analysis of shrinkage, creep and vehicle load, the time-risk probability of cable-stayed bridge in service is studied, and the quantitative and qualitative methods are used to estimate the time-dependent risk loss. 3) put forward the evaluation principle and criterion of the limitation risk evaluation of the cable-stayed bridge in service, and put forward the corresponding measures to deal with the time-effect risk; 4) the aging degradation of steel structural members, cable members and reinforced concrete is studied, and the corresponding theoretical formulas of resistance degradation are deduced. 5) based on the time-dependent risk analysis theory proposed in this paper, the performance of the Sutong Bridge during the normal period of operation is analyzed and predicted, and the variation rule of the time-effect risk of the bridge during the operation period is obtained. At the same time, the control measures should be taken in the corresponding key risk stages.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U448.27
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