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Performance Verification and Judgment on Existing Concrete Structures Based on Reliability Basis

基于可靠性基础的既有混凝土结构性能验证与判定

基本信息

批准号：
13650507
负责人：
MORIKAWA Hidenori
金额：
$ 2.37万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

(1) The maintenance plays an important role for the performance guarantee of a concrete structure. The concept of guaranteeing to maintain a required performance during the required service period by uniting the design and construction with the maintenance, and synchronizing, was proposed. In that case, the importance of setting the allowed reliability limit was pointed out.(2) For the monitoring of corrosion by the polarization resistance, and estimation of deterioration and the performance, RC beams were subjected to salt water condition. Loading tests were performed both before and after deterioration, and then weight of corroded reinforcing bar was measure.(3) There are still a lot of uncertain points concerning the loading capacity of concrete members with deterioration due to ASR, under reversed cyclic loading. Then, the reversed cyclic loading tests were performed on RC beams with ASR deterioration.(4) It is important to evaluate the effect of scatter and distribution of concrete strength for the reliability analysis of existing concrete structures. In this study, loading tests of RC beams considering distribution of concrete strength were performed. And also FEM analyses were performed for comparison with the experimental results.(5) The uncertainty of some parameters of the RC bridge with chloride induced deterioration was investigated referring to the result of the research of the deterioration mechanism, and the performance evaluation of a structure was performed. Moreover, a bridge structure constituted by several girders has degradation in girder stiffness due to corrosion of reinforcing bars and cyclic loading. The safety evaluation of such bridges considering scatter of section force due to degradation in girder stiffness, was also performed.

(1)混凝土结构的养护是保证结构性能的重要环节。提出了通过设计、施工与维修相结合，同步进行，保证在规定的服务期内保持规定的性能的概念。在这种情况下，指出了确定允许的可靠性限度的重要性。(2)为了通过极化电阻监测钢筋混凝土梁的腐蚀情况，并评估钢筋混凝土梁的劣化程度和性能，对钢筋混凝土梁进行了盐水腐蚀试验。对锈蚀前后的钢筋进行了荷载试验，并测量了锈蚀后钢筋的重量。(3)在低周反复荷载作用下，由于ASR而劣化的混凝土构件的承载力仍存在许多不确定性。然后，进行了ASR退化钢筋混凝土梁的低周反复荷载试验。(4)在役混凝土结构的可靠度分析中，混凝土强度的分散和分布对结构可靠度的影响是非常重要的。本文进行了考虑混凝土强度分布的钢筋混凝土梁加载试验。并与实验结果进行了对比分析。(5)结合混凝土桥梁氯离子损伤机理的研究成果，对氯离子损伤混凝土桥梁的相关参数的不确定性进行了研究，并对结构进行了性能评估。此外，由多个梁构成的桥梁结构由于钢筋的腐蚀和循环载荷而使梁刚度退化。考虑到由于主梁刚度退化而引起的截面力分散，对此类桥梁进行了安全性评估。