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Seismic base shear coefficients of long-period structures subjected to far-field ground motions


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Seismic base shear coefficients of long-period structures subjected to far-field ground motions
Guan Minsheng1 Du Hongbiao1 Zeng Qingli1 Cai Wei1 and Cui Jie2
1) College of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China2) Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510405, Guangdong Province, P.R.China
building science substructurefar-field ground motion near-field ground motion long-period structure seismic base shear coefficient
The paper aims to investigate the effect of far-field ground motions with two amplitude modulation means, i.e. peak ground acceleration (PGA) and peak ground velocity (PGV), on seismic base shear coefficients of long-period structures. Three far-field earthquake records and one typical near-field accelerogram are chosen as inputted ground motions. Six steel reinforced concrete frame-core wall structures are designed and studied through dynamic time history analyses with a set of four selected ground motions scaled to the fortification earthquake level. Numerical results show that, by scaling PGA, the seismic base shear coefficients under far-field ground motions are significantly larger than those of the near-field ground motion. However, in the way of scaling PGV, the difference between two types of earthquake records is minor. The structural top displacements are more effected by the far-field ground motions in comparison with those of the near-field ground motion under the two scaling methods. It is also found that the two structural responses, the top displacement and the seismic base shear coefficient, in the way of scaling PGV are larger than those of scaling PGA, which indicates that the velocity spectrum has more sensitivity than the acceleration spectrum in the case of analyzing long-period structures. As a result, the PGV amplitude modulation manner is suggested to be adopted in time history analyses of long-period structures.



Last Update: 2017-09-11