关于既有混凝土结构耐久性评定方法的研究

Research on Durability Evaluation Method of Existing Concrete Structure

随着城市更新,既有钢筋混凝土结构的耐久性问题逐渐成为加固改造工程关注的重点,但受于现有的技术手段的限制,目前耐久性评定尚停留在定性评估的层面,耐久性计算评定的方法没有得到很好的统一,不同评定方法的使用条件也并没有明确的规定,使得针对同一建筑的耐久性评定,选用不同的评定方法会得出截然不同的评定结果。论文阐述了既有钢筋混凝土结构耐久性的主要影响因素和目前主流评定方法,并结合北京市20世纪80年代末某高层建筑的实际检测案例,依据不同标准中的三种方法对一般大气环境下的混凝土结构进行完整的耐久性年限计算。通过对计算结果和计算参数的分析与比对,最终指出三种方法间存在的差异,给出三种方法的在实际工作中的应用建议,为评定方法的选择提供参考,为后续类似耐久性评定项目的方案制定、检测实施和计算评定提供了一定的帮助。

With the urban renewal,the durability of existing reinforced concrete structures has gradually become the focus of reinforcement and renovation projects.However,the durability evaluation is still on the qualitative evaluation level for the limitations of existing technical means.There is no uniformity of methods for durability evaluation,and there is no clearly definition for different conditions of evaluation.Therefore,for the same building,different methods will get completely different evaluation results.This paper describes the main influencing factors and the current mainstream evaluation methods of durability of existing reinforced concrete structures,and take a high-rise building in Beijing in the late 1980s as a case,according to different standards of three methods to calculate the durability of concrete structures in general atmospheric environment.The differences are finally pointed out through the analysis and comparison of the calculation results and parameters for the three methods,and the application suggestions are given in practical work.In order to provide reference for the selection of evaluation methods and provide some help for the follow-up project plan formulation,testing implementation and calculation evaluation.