Abstract
Due to abundant low-frequency components of long-period ground motions (LPGMs), long-period structures are susceptible to severe damage. The corresponding time-history displacement responses have significant “large-displacement” and “long-duration” characteristics. These action characteristics essentially reflect the different loading paths imposed on structures of LPGMs from ordinary ground motions (OGMs). Hence, revealing the influence mechanism of the action characteristics on the seismic performance of structural components is the key to investigating the influence of LPGMs on the whole structure. This paper presents a kind of quasi-static loading protocol considering the action characteristics of LPGMs. Firstly, nonlinear time-history analyses on structural systems subjected to 50 selected representative LPGMs were conducted. Inelastic cycles and corresponding amplitudes of time-history displacement responses under LPGMs were statistically analyzed through the rainflow method. Then, considering two of the most significant factors, structural period and target ductility, a prediction model of cycle number and cycle amplitude was obtained by regression. On this basis, the quasi-static loading protocol considering the action characteristics of LPGMs was developed. Proposed protocols can be directly applied to experimental investigations on the seismic performance for structural components under LPGMs.
Highlights
Long-period ground motions (LPGMs) refer to the far-field ground motions with predominant periods of 1∼10 s or longer in general, whose cause is primarily related to the propagation path of seismic waves [1]
Plenty of researches [5,6,7,8,9,10,11,12,13,14,15,16] showed that the loading path has a remarkable influence on the strength and stiffness deterioration, deformation performance, energy dissipation capacity, and failure mechanism of structural components. erefore, it can be considered that revealing the influence mechanism of the LPGMs action characteristics, “large-displacement” and “long-duration,” on the seismic performance of structural components is the key to investigating the influence of LPGMs on the whole structure
Quasi-static loading protocols considering the action characteristics of LPGMs could provide a possibility for experimental investigation of seismic performance and failure mechanism for structural components subjected to LPGMs
Summary
Long-period ground motions (LPGMs) refer to the far-field ground motions with predominant periods of 1∼10 s or longer in general, whose cause is primarily related to the propagation path of seismic waves [1]. Existing researches [2,3,4] indicated that the time-history displacement responses of long-period structures under LPGMs have distinct characteristics of “large-displacement” and “longduration.” It essentially reflects different action paths imposed on structures of LPGMs from ordinary ground motions (OGMs). Quasi-static loading protocols considering the action characteristics of LPGMs could provide a possibility for experimental investigation of seismic performance and failure mechanism for structural components subjected to LPGMs. e loading history of ground motions imposed on structures can be regarded as a random loading process. Considering two of the most significant factors, structural period and target ductility, a prediction model of cycle amplitude and cycle number was proposed by regression On this basis, the quasi-static loading protocols for structural components in SDOF and MDOF systems under LPGMs were developed
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