The damage evaluation of reinforced concrete beams under the repeated loading

• Main Authors: Chin-Sheng Hsu, 許晉盛
• Other Authors: Wen-Hsiung Chen
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/65728190323339868593

碩士 === 國立中央大學 === 土木工程研究所 === 83 === After loading,the inner parts of cracking will occur bond failure.This bond failure will cause the stiffness degradation and the change of dynamic behavior. The thirty-eight beams were tested under both the one and repeated loading to investigate the effects of internal bond failure on the natural frequency of reinforced concrete beams.The principal variables were the loading cycles,bar diameter,span length/depth .It is the object to study the natural frequency,the crack width on the concrete surface under loading and unloading ,the cleavage length on the interface between the reinforced bar and the concrete cover under loading in each step. The paper provided an easy method of non-destruction testing for bridge in final chapter.This method was performed by the change of natrual frequency. So far the method subjected can't be used in filed right now,because it is not perfect and complete.