Behavior of RC Square Columns with Diaphragm under Eccentric Axial Compression

• Main Authors: Chang, Wen-Chien, 常文騫
• Other Authors: Chang Jia-Shang
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/09498754862705288055

碩士 === 國立成功大學 === 建築(工程)學系 === 86 === When RC building is subjected to horizontal earthquake loading, if a column doesn''t have enough strength of moment- resistance , the plastic hinge will occur on its both ends .Besides , it will elongate the vibration period and even make the structure unstable as the amount of plastic hinge is too large. In order to improve this problem,a column with diaphram on both sides can be used. In this thesis, the behavior of RC columns with diaphram under eccentric axial compression were investigated.Totally 13 columns with both-side-diaphram were tested. During test the loading is monotonic,and the complete P- Δand M-ψrelationship from elastic to ultimate are recorded. Using the test results, the influence of parameters such as eccentricity of load , length of diaphram 、hoop style and reinforcement ratio of diaphram have been disscussed. The difference among experment, analysis and JIA design The test results of the 13 specimens reveal that :1. The less eccentric distance is, the higher ultimate strength it needs. Longer length of diaphram will increase the ultimate strength and reduce the corresponding lateral displacement at the mid-point of the column .Higher reinforcement ratio also increases the ultimate strength ,and delay the ultimate deformation.In this study ,the influence of hoop style of diaphram isn''t obvious in ultimate strength but in lateral displacement.2. The P-Δand M- ψanalysis curve obtained by three-dimensional finite difference model has good argument with that of experiment.3. The calaulation of JIA formula is much lower than the results of experiment.4. The difference between calculation and experiment will reduce if the reinforcement amount and arrangement in the diaphram is considered.