基于全壽命設(shè)計(jì)的鋼筋混凝土結(jié)構(gòu)安全度研究與應(yīng)用
[Abstract]:Because the design code of our country has not fully considered the performance state of the structure after aging, with the continuous improvement of the engineering design theory, the research on the whole life cycle reliability theory of concrete frame structure has become a hot topic. In this paper, the whole life seismic reliability of concrete frame structure is studied. The main research work and the results obtained are as follows: (1) because the load values of different life are different, according to the model of earthquake probability, The seismic intensity, acceleration, maximum value of seismic influence coefficient and the value of recurrence period are deduced. Based on the seismic action of 50 years, the maximum correction coefficient, the peak acceleration correction coefficient and the intensity correction coefficient of the seismic influence coefficient are put forward, and the formula is derived. In order to facilitate the application of the formula, the parameters of the formula are fitted by SPSS software, and the error analysis is carried out to prove the reliability of the formula. (2) taking the displacement angle between the layers of the structure as the performance index of the structure, In this paper, the incremental dynamic analysis method (IDA) is used to calculate the seismic reliability of frame structure, and the method of minimum resistance is given to calculate the seismic reliability of the whole life cycle of frame structure. (3) the corrosion and deterioration model of steel bar is analyzed. The damage concrete constitutive model, the node slip model, and the calculation parameters of the frame structure in the whole life cycle are obtained. By comparing the reliability of structures in different service stages under the same earthquake action, it is shown that the longer the service life of the structures, the lower the reliability of the structures. With the increase of service life and earthquake action, the decreasing amplitude is faster and faster. (4) the seismic reliability of the whole life cycle of the structure is calculated by using the method of minimum resistance, and compared with that of the structure without considering the degradation of material performance. The results show that the failure probability of the structure considering the degradation of wood property is greater than that of the structure without considering the degradation of wood property. And the difference between the two is increasing with the increase of design life. (5) when the performance of the existing structure can not meet the requirements of seismic performance, it is necessary to strengthen the structure. This paper summarizes the relationship between the maintenance cost of the structure and the reliability of the structure. The calculation method of the failure cost of the structure is summarized, and the decision model of the maintenance and demolition criteria and the maintenance scheme is given. The model is used to optimize the reinforcement of the frame, and the optimal reliability is obtained, and the practicability of the model is verified.
【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】:2016
【分類號(hào)】:TU375
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