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http://dx.doi.org/10.12989/eas.2020.18.4.519

Seismic reliability analysis of structures based on cumulative damage failure mechanism  

Liu, Qiang (College of Engineering Technology, Jimei University)
Wang, Miaofang (College of Engineering Technology, Jimei University)
Publication Information
Earthquakes and Structures / v.18, no.4, 2020 , pp. 519-526 More about this Journal
Abstract
Non-stationary random seismic response and reliability of multi-degree of freedom hysteretic structure system are studied based on the cumulative damage failure mechanism. First, dynamic Eqs. of multi-degree of freedom hysteretic structure system under earthquake action are established. Secondly, the random seismic response of a multi-degree freedom hysteretic structure system is investigated by the combination of virtual excitation and precise integration. Finally, according to the damage state level of structural, the different damage state probability of high-rise frame structure is calculated based on the boundary value of the cumulative damage index in the seismic intensity earthquake area. The results show that under the same earthquake intensity and the same floor quality and stiffness, the lower the floor is, the greater the damage probability of the building structure is; if the structural floor stiffness changes abruptly, the weak layer will be formed, and the cumulative damage probability will be the largest, and the reliability index will be relatively small. Meanwhile, with the increase of fortification intensity, the reliability of three-level structure fortification is also significantly reduced. This method can solve the problem of non-stationary random seismic response and reliability of high-rise buildings, and it has high efficiency and practicability. It is instructive for structural performance design and estimating the age of the structure.
Keywords
cumulative damage failure mechanism; hysteretic structure system; pseudo excitation method; precise integration method; seismic reliability analysis;
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