既存コンクリート系建築物における鉄筋のガス圧接継手の継手破断強度の分布性状に関する研究

抄録

The strength of gas-pressure welded joint has been assumed as strong as the strength of the base reinforcement. However, many gas-pressure welded joints were breaked in RC and SRC structural buildings during the 1995 Hyogoken Nanbu Earthquake. After earthquake, we picked up 365 test pieces of gas-pressure welded joints from the damaged RC and SRC structural buildings, and those pieces were tested by the tension test. The 12.6% pieces in all test specimens were breaked at welded joints. Therefore, the strength of gas-pressure welded joints in the existing concrete structural buildings are not able to apply the present evaluation. This paper is a study on the strength distribution of gas-pressure welded joints. The strength distribution of gas-pressure welded joints were researched by the data of Hyogoken Nanbu Earthguake and another test data of 23 public experiment institutions in Japan. From the research of this study, we took mainly the following conclusions. (1)The strength of gas-pressure welded joints used in the existing concrete structural buildings were not evaluated as strong as the strength of the base reinforcement. (2)We proposed the probability distribution function of strength for gas-pressure welded joints used in the existing concrete structural buildings.