磨筋法与钻孔法推算混凝土构件配筋实际应力的比较研究

Comparative Study on Abrasion Method & Drilling Method to Estimate Actual Stress of Steel Bars Embedded in Reinforced Concrete Building Members

摘要: 既有建筑结构的安全评估、质量鉴定、加固改造，事故分析常需准确推算混凝土构件中纵筋的实际应力，依此估算构件实际内力，但目前混凝土结构检测鉴定极少能涉及或提供这些数据。磨筋法与钻孔法是作者近年首次提出的推算混凝土构件配筋实际应力的两种实用方法，均基于弹性分析结合常规检测计算求解(补充实测变量的解析计算)，多项模拟试验表明其精度满足工程需要。介绍了两种方法并进行了比较与分析，证明了两者的内在联系及其一致性，结果可供混凝土结构检测鉴定与同类研究参考。分析表明，基于相同原理，经进一步改进测试工艺与精度，钻孔法还可拓展用于推算超长混凝土结构实际组合应力(含温度应力)，及混凝土结构中实际预应力效应。

Abstract: In security assessment, quality assurance, retrofitting and accident analysis for reinforced concrete structures, it is often needed to estimate the actual stress of longitudinal steel bars embedded in members, then as the basis, to estimate the actual internal forces of those members, but detection and identification now about existent concrete structures can hardly provide these dates. Abrasion Method and Drilling Method are the two practical ways proposed in recent years by author, which are based on elastic analysis and routine testing (analytical calculation of supplementary measured variable), and the accuracy meets engineering needs by application test verifications in past. In this paper, the two methods are introduced and comparatively analyzed, the intrinsic link and consistency between these two are proved as the reference for detection, identification and similar studies of reinforced concrete structures. Based on the same principle and further improvement of the test process and the accuracy, Drilling Method can also be used to estimate the combined stress (including temperature stress) in super-long concrete structures and the prestress efficiency in prestressed concrete structures.