桥梁水下桩基病害分级区间确定方法研究

Degree Classification for Defective Underwater Pile of Bridge

针对我国现有桥梁水下桩基病害损伤程度评定的相关分级标准存在评估指标难以定量化、分级标度不统一、划分过程主观性较强等不足,提出一种病害程度区间定量划分的方法,该方法将桥梁水下桩基常见病害分级标度统一为5级,并将有限元计算数据作为确定各标度区间范围的分析依据,以增强病害分级评定的客观性。首先,采用有限元软件ABAQUS研究了水下桩基6种常见病害对桥梁桩基水平承载力的影响程度;其次,根据有限元计算结果,基于类相关离散化思想将不同病害的损伤程度统一划分为5个连续区间;最后,对照现有规程给出的病害分级评定标准,验证了所提出的病害分级评定标准确定方法的正确性和科学性,为桥梁水下桩基安全评估奠定了基础。

In view of the related grading standards for assessing the damage degree of underwater pile foundations of bridges in our country, there are still some shortcomings such as the difficulty of quantifying the assessment indicators, the inconsistent grading scale, and the strong subjectivity of the division process. This method unifies the classification scale of common defects of bridge underwater pile foundation into 5 levels, and uses the finite element calculation data as the analysis basis for determining the interval range of each scale, so as to enhance the objectivity of disease classification and assessment. This paper firstly uses the finite element software ABAQUS to study the impact of six common diseases of underwater pile foundations on the horizontal bearing capacity of bridge pile foundations. Secondly, according to the finite element calculation results, the damage degree of different diseases is unified to five continuous intervals based on the class correlation discretization idea. Finally, comparing with the disease grading evaluation standard given by the existing regulations, the correctness and scientificity of the method for determining the disease grading evaluation standard proposed in this paper are verified, which lays the foundation for the safety assessment of bridge underwater pile foundation.