Although the use of Geosynthetic Reinforced Soil (GRS) bridge abutments has been increasing, the seismic performance of such structures has remained a significant concern due to their unknown behavior in load-bearing and stress distribution under bridge load and seismic conditions simultaneously. This paper investigates the static and dynamic response of GRS bridge abutment. A series of numerical models representing the realistic field conditions of these structures, including two reinforced soil walls and a single span deck that restrains the top of walls, rather than equivalent surcharge load, was developed. The calibrated numerical model in FLAC program was used to evaluate the effects of horizontal restraint from the deck on the GRS wall displacements and reinforcement loads at the end of construction and under harmonic base acceleration up to 0.5 g. Results indicated that the restraint mobilized from the bridge deck presence, considerably affected the results at both the end of construction and after the dynamic load was applied. Moreover, a series of the parametric studies were performed to investigate the influences of backfill soil relative compaction, reinforcement stiffness, reinforcement length, and reinforcement vertical spacing on the response of GRS abutments at the end of construction and post dynamic state.

尽管土工合成增强土 (GRS) 桥梁桥台的使用一直在增加，但由于它们在桥梁荷载和地震条件下的承载和应力分布方面的未知行为，这种结构的抗震性能仍然是一个重要的问题。本文研究了 GRS 桥台的静态和动态响应。开发了一系列代表这些结构的实际现场条件的数值模型，包括两个加筋土墙和一个限制墙顶部的单跨甲板，而不是等效的超载荷载。FLAC 程序中的校准数值模型用于评估在施工结束时和在高达 0.5 g 的谐波基础加速度下，甲板水平约束对 GRS 墙体位移和钢筋载荷的影响。结果表明，从桥面板的存在中调动的约束对施工结束和施加动态载荷后的结果都有很大影响。此外，还进行了一系列参数研究，以研究回填土的相对压实度、加筋刚度、加筋长度和加筋垂直间距对 GRS 桥台在施工结束和动态后响应的影响。对施工结束和施加动态载荷后的结果都有很大影响。此外，还进行了一系列参数研究，以研究回填土的相对压实度、加筋刚度、加筋长度和加筋垂直间距对 GRS 桥台在施工结束和动态后响应的影响。对施工结束和施加动态载荷后的结果都有很大影响。此外，还进行了一系列参数研究，以研究回填土的相对压实度、加筋刚度、加筋长度和加筋垂直间距对 GRS 桥台在施工结束和动态后响应的影响。