基于非破坏性试验的既有结构构件抗力推断方法

发布时间：2018-06-03 13:54

本文选题：既有结构评定 + 非破坏性试验　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：构件抗力的准确推断是评定既有结构可靠性的重要前提。目前,用于构件抗力的推断方法主要有基于破坏性试验的直接推断法和基于材料试验的间接推断法。直接推断法的推断结果能真实反映构件的实际抗力,但不便于应用,也不符合既有构件继续承载的要求;间接推断法虽容易实现,但推断结果过于保守,不能很好地考虑构件抗力的实际性能。国际上提出了在试验不充分条件下推断构件抗力的方法,该法综合了目前直接和间接推断法的优点,但仅能给出抗力的下限值,不能对构件的实际抗力作出最终的推断,也未定量考虑推断中的不确定性,未考虑多个试件时的综合判定方法。针对目前抗力推断方法的不足,本文提出了基于非破坏性试验的既有构件抗力推断方法。首先,按照非破坏性试验的要求,对抗力采用定态的试验方式,即以试件达到设定状态作为试验结束的标志;然后,利用随机过程及条件概率的分析方法,建立试验不充分条件下单个试件抗力的概率预测方法;最后,依据各试件的概率预测结果,通过全概率分析,进一步针对多个试件建立构件抗力的小样本推断方法。在已建立理论方法的基础上,将此法具体应用到钢筋混凝土受弯构件中,建立基于非破坏性试验的钢筋混凝土受弯构件受弯承载力的推断方法。实例分析的结果表明,本文所提出的推断方法对构件自身信息的利用更为全面,推断结果较为贴近实际值且具有较小的变异性。基于非破坏性试验的抗力推断方法是对目前既有构件抗力推断方法的补充,该法中的试验为非破坏性试验,在不损坏构件的基础上,考虑了构件抗力的实际性能,弥补了直接推断法和间接推断法的不足,完善了国际上试验不充分条件下抗力的推断方法,且该法具有更为突出的实证性和针对性。该法的提出拓展了结构试验的应用领域,为既有结构的可靠性评定提供了更具实证性的试验辅助方法,从而更有效地保证结构、特别是重大工程结构和新型结构的可靠性。
[Abstract]:The accurate inference of the resistance of the component is an important prerequisite for evaluating the reliability of the existing structure. At present, the methods used to infer the resistance of the component mainly include the direct inference method based on the destructive test and the indirect inference method based on the material test. The inference results of the direct inference method can truly reflect the actual resistance of the component, but it is not convenient for application and is incompatible. The indirect inference method is easy to carry out, but the indirect inference method is easy to be realized, but the inference result is too conservative to consider the actual performance of the component resistance very well. The method to infer the resistance of the component under the condition of insufficient test is put forward. This method combines the advantages of the direct and indirect inference method at present, but it can only give the force of resistance. The limit value can not make a final inference to the actual resistance of the component, and do not consider the uncertainty in the inference, and do not consider the comprehensive determination method of multiple specimens. In view of the shortage of the present method of resistance inference, this paper proposes an anti force inference method based on the non destructive test for the existing components. First, according to the non destructive test. The test mode of the antagonism is used in the fixed state, that is to use the test piece to reach the set state as the sign of the end of the test. Then, the probability prediction method of the single specimen under the condition of insufficient test is established by using the analysis method of the random process and the condition probability. Finally, according to the probability prediction results of each test piece, the method is made through the full probability analysis. On the basis of the established theoretical method, the method is applied to the reinforced concrete flexural member, and the inference method of flexural bearing capacity of reinforced concrete flexural members based on non destructive test is established on the basis of the established theoretical method. The results of the actual case analysis show that the inference proposed in this paper is deduced. The method is more comprehensive for the use of the component's own information, and the result is more close to the actual value and has smaller variability. The method of resistance inference based on the non destructive test is a supplement to the present method of the resistance inference of the existing components. The test in this method is a non destructive test, and the resistance of the component is considered on the basis of not damaging the component. The actual performance makes up the shortage of direct inference method and indirect inference method, and improves the inference method of resistance under the condition of inadequate test in the world, and the method has more prominent positivism and pertinence. The proposed method extends the application field of structural test and provides a more empirical test for the reliability evaluation of existing structures. The auxiliary method can be used to ensure the reliability of structures, especially for major engineering structures and new structures.
【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】：2015
【分类号】：TU312

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