On The Fatigue Damage Of Steel Structure To Strong Earthquakes

• Main Authors: Chien-yao Chiu, 邱建堯
• Other Authors: Tzu-chiang Chan
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/06472824126547630162

碩士 === 逢甲大學 === 土木工程所 === 97 === Following the well development of displacement-based design theory, the fatique failure of structures becomes an important topic of research. It is known that structures under strong earthquake–causing large deformation–may induce failure by low-cycle fatigue; In this type of failure, structure members will undergo cyclic and plastic deformations and the structures will be damaged, even collapse, if the accumulation of hysteresis energy reaches a limit level. The purpose of this study is to investigate the cyclic demands of the maximum strain range of structure members due to seismic force. Also, the existing test results of S-N curves are used to check if the structure members could be failed by low-cycle fatigue. In this study, 5&10-story steel structures, near Che- Lunp-Pu fault, are designed, based on the Taiwan current codes. These steel structures are undertaken nonlinear dynamic analyses to obtain response histories, using 16 of 921 chi-chi earthquake data near Che-Lunp-Pu fault. The Fortran of Rainflow method are employed to analyze response histories, in order to obtain the equivalent maximum strain cyclic demands. The results show that the structural members would fail under TCU052, TCU054&TCU102 earthquakes, as compared to the existing S-N curve data.