More and more geosynthetic-reinforced soil (GRS) walls have been built and proven to have good seismic performance under severe earthquakes. In design guidelines for GRS walls under seismic conditions, peak ground acceleration (PGA) is usually used to represent the influence of the earthquake. However, to properly describe seismic loadings, three components, amplitude, frequency, and duration of seismic loading, should be considered. Although with the existence of the problem, limited studies have been conducted to understand the relationship between the intensity measure (IM) of seismic loadings and the seismic responses of GRS walls. A good correlation between seismic response and IM is yet to be studied. This study presents and compares the relationships of one IM (response spectrum, SA), two IM combinations (SA and Arias intensity, IA), and three IM combinations (SA, IA, and relative significant duration, RSD) to the seismic responses of GRS walls, including maximum reinforcement loads and relative lateral facing. The results show that considering only one IM (SA) of the input motions is not adequate for the prediction of the wall facing displacements while considering only the SA of the input motions is satisfactory for the prediction of the maximum reinforcement loads. The uncertainty of the predicted seismic responses owing to the variability of input seismic motions could be decreased considerably by using the combined intensity measures to generate the seismic motions. A good correlation can be reached by matching two IMs (SA and IA). Only a slight increase in the coefficient of determination (R^2) when the three matched IM artificial signals are utilized, demonstrating that at least two matched IMs combination might be used to provide a better prediction of the seismic performances.

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