Abstract Regarding the inadequacy of quantitative measurements of geotechnical aspects for assessing the behavior of the piled raft with different head connections during seismic events, A series of shaking table tests modeling, including un-piled-raft foundation, connected and non-connected piled-raft systems with 4 piles and dry sand were conducted. The efficiency of pile head separation and the material of the interposed layer between pile and cap for reducing the bending moment along with the piles length under different excitation scenarios were investigated by imposing base shaking levels with PGAs that ranged between 0.1 to 0.4 g, simulating weak to strong ground motions. Moreover, a comprehensive study is conducted on seismic ground motion amplification patterns induced by piled-raft systems in the soil body and caps as well as lateral raft movements. Based on the shaking table results, the non-connectivity between piles and caps decreased the maximum bending moment of piles by 20–60%, based on input motion amplitudes and cushion layer material. The dependency of both mechanism and amplitude of amplification on the level of base shaking and pile-raft connection details are also revealed.

中文翻译：

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使用振动台试验评估连接和非连接桩筏系统的动态响应

摘要 针对地震事件中不同头部连接的桩筏性能评估岩土方面定量测量的不足，一系列振动台试验建模，包括非桩筏基础、连接和非连接桩筏进行了 4 个桩和干沙的系统。通过施加范围在 0.1 至 0.4 g 之间的 PG​​A 的基础振动水平，模拟弱到强烈的地面运动。而且，对由土体和顶盖中的桩筏系统以及横向筏运动引起的地震地震动放大模式进行了综合研究。根据振动台结果，基于输入运动幅度和垫层材料，桩和帽之间的非连通性使桩的最大弯矩降低了 20-60%。还揭示了放大的机制和幅度对基础振动和桩筏连接细节水平的依赖性。