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Numerical study of a multiple post-tensioned rocking wall-frame system for seismic resilient precast concrete buildings

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Earthquake Engineering and Engineering Vibration 2022年第2期21卷 377-393页

作者： Afshin Naserpour Mojtaba Fathi Department of Civil Engineering Engineering FacultyRazi UniversityKermanshah ***Iran

A multiple rocking wall-frame(MRWF)system,in which the wall panels are directly connected to the adjacent beams and foundation is presented *** the MRWF system,the unbonded post-tensioned(PT)tendons are used to promote the self-centering ability,and O-shaped steel dampers are applied to enhance the energy dissipation capacity and reparability of the ***,analytical equations are proposed to determine the behavior of the O-shaped ***,the MRWF system is numerically evaluated for five different models consisting of rocking walls with varying numbers and arrangements while keeping the total effective width of wall panels *** numerical results show that with an increase in the number of wall panels and a decrease in the wall width,the hysteretic behavior of the MRWF system tends to the ideal flag-shaped pattern,resulting in little damage to the beams,insignificant strain in the wall toe,negligible residual drifts and damage index of less than 0.2 under severe *** contrast,the conventional model demonstrates extensive damage to the structural elements due to undesirable wall-to-frame interaction,which leads to a damage index of 0.78 and residual drifts of 0.42%under seismic loads.

关键词： precast wall-frame system rocking behavior post-tensioning O-shaped steel damper residual drift

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Development of rocking constraint device with vertical damping capacity for three-dimensional base-isolated frame structures

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Frontiers of Structural and Civil Engineering 2023年第3期17卷 350-367页

作者： Yundong SHI Qi WANG Wenqing DONG Bo ZHAO Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation (Ministry of Emergency Management)Harbin 150080China School of Civil Engineering Tianjin UniversityTianjin 300072China

A new rocking constraint device(RCD)is developed for three-dimensional(3D)base-isolated frame structures by connecting a custom-designed cylinder pair to provide vertical damping with replaceable damping components installed outside the cylinders when the superstructure undergoes translational motion,and rocking constraint capacity when the superstructure is susceptible to *** formulas for calculating the damping and rocking constraint stiffness of the RCD are *** series of sinusoidal loading tests are conducted at different loading frequencies and amplitudes to verify the damping and rocking constraint performance of the *** test results show that the cylinder without orifices on its piston can provide the desired damping with a replaceable damping component,and that the RCD can effectively suppress *** the vertical stiffness of an individual cylinder is affected by the location of the replaceable damping component and loading frequency,the average vertical stiffness of the two cylinders,which determines the rocking constraint stiffness of the RCD,is independent of the two *** of the test and theoretical results indicate that the errors of the proposed formulas for calculating the damping and rocking constraint stiffness of the RCD do not exceed 12.9%and 11.0%,respectively.

关键词： three-dimensional isolation rocking behavior rocking constraint device replaceable damping component sinusoidal test

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