混凝土受弯构件裂缝控制的可靠度分析

发布时间：2018-05-04 14:00

本文选题：混凝土构件 + 正常使用极限状态　；参考：《西安建筑科技大学》2017年硕士论文

【摘要】：裂缝控制是混凝土构件正常使用极限状态设计的重要内容之一,对混凝土构件的正常使用有着重要影响。我国目前对混凝土构件的裂缝控制采用的是以结构可靠度理论为基础的近似概率极限状态设计法,但其建立过程中对裂缝控制的可靠度分析并不完善,主要表现为:对准永久值组合中的作用概率组合,采用随机变量组合方法,存在理论上的缺陷;以个别典型情况为例验证裂缝控制的可靠度水平,难以全面揭示裂缝控制的可靠度水平;对裂缝控制的目标可靠指标缺乏明确的规定,不利于对可靠度水平的精确控制。鉴于目前的状况,有必要改进混凝土构件裂缝控制的可靠度分析方法,全面揭示裂缝控制实际的可靠度水平。论文将针对钢筋混凝土和预应力混凝土受弯构件,建立合理的裂缝控制可靠度分析方法,全面校准我国现行裂缝控制方法的可靠度水平,并提出裂缝控制的目标可靠指标和设计建议。主要研究内容包括:利用随机过程理论,论述我国目前准永久组合中作用概率组合方法的理论缺陷,并针对以准永久值参与组合的可变作用,提出作用的随机过程组合方法,建立裂缝控制可靠度分析的模型;利用无量纲的方法,建立裂缝控制可靠度分析的一般功能函数,通过可靠度校准全面揭示我国现行裂缝控制方法的可靠度水平;根据校准结果,提出混凝土构件裂缝控制目标可靠指标的建议值,并通过对可靠度主要影响因素的分析,为混凝土构件的裂缝控制提出设计建议。论文研究成果将促进结构可靠性理论在混凝土构件裂缝控制方面的发展,为混凝土构件的裂缝控制提供更为坚实的理论基础。
[Abstract]:Crack control is one of the important contents in the design of the limit state of normal use of concrete members, which has an important influence on the normal use of concrete members. At present, the approximate probabilistic limit state design method based on the theory of structural reliability is used for crack control of concrete members in China, but the reliability analysis of crack control is not perfect in the process of its establishment. The main results are as follows: the combination of action probability in the combination of alignment permanent values and the combination of random variables have theoretical defects, and the reliability level of crack control is verified by taking some typical cases as examples. It is difficult to fully reveal the reliability level of fracture control, and the lack of clear provisions on the target reliability index of fracture control is not conducive to accurate control of reliability level. In view of the present situation, it is necessary to improve the reliability analysis method of crack control of concrete members and to reveal the actual reliability level of crack control. In this paper, a reasonable reliability analysis method for crack control is established for reinforced concrete and prestressed concrete flexural members, and the reliability level of current crack control methods in China is calibrated comprehensively. At the same time, the target reliability index and design suggestion of crack control are put forward. The main research contents are as follows: using the stochastic process theory, this paper discusses the theoretical defects of the function probability combination method in the quasi permanent combination in our country, and puts forward the combination method of action random process for the variable action of the combination with the quasi-permanent value. The model of fracture control reliability analysis is established, the general function of fracture control reliability analysis is established by dimensionless method, and the reliability level of current fracture control methods in China is revealed by reliability calibration. According to the calibration results, the suggested values of reliability index of concrete members crack control target are put forward, and through the analysis of the main influencing factors of reliability, the design suggestions for crack control of concrete members are put forward. The research results of this paper will promote the development of structural reliability theory in crack control of concrete members and provide a more solid theoretical basis for crack control of concrete members.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU37

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