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首页> 外文会议>International Conference on Computational and Experimental Engineering and Sciences >Effective Foundation Input Motion for Soil-Steel Pipe Sheet Pile (SPSP) Foundation System
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Effective Foundation Input Motion for Soil-Steel Pipe Sheet Pile (SPSP) Foundation System

机译：土钢管板桩（SPSP）基础系统的有效基础输入运动

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An experimental investigation to evaluate the effective foundation input motion (EFIM) of a soil-steel pipe sheet pile (SPSP) foundation system under 1g conditions was carried out through scaled model testing on a shaking table. The scaled model with 20 piles interlocked together to form a circular assembly was embedded in dry cohesionless Gifu sand housed in a laminated shear box. Tips of all the piles were rigidly bolted at the bottom of the shear box while the heads were rigidly connected to a footing. Amplitude and frequency dependent EFIM at the footing level of SPSP foundation model is obtained under dynamic ground excitations. Carried out experiments encompass a range of low-to-high amplitude of lateral harmonic ground excitation, covering elastic-to-inelastic behaviour of soil. Results show that the amplitude of EFIM at the SPSP footing level and the resonant frequency of the soil-SPSP foundation system decreases with the increase in the amplitude of excitation due to the fact that the increase in the loading amplitude results in the increase in the soil strain and thus decreases the soil stiffness. Results are also obtained in the form of kinematic interaction factors (KIF). The KIF is found approximately equal to unity up to the resonant frequency of the soil-SPSP foundation system, however, decreases above the resonant frequency reflecting the filtering effect of soil-SPSP kinematic interaction. For higher amplitude of excitations, an increase in the KIF (more than unity) is observed for a considerable number of frequencies, particularly around the lower frequency region. This can be attributed to the nonlinearity induced in the soil due to the higher amplitude of excitation.
机译：通过在振动桌上的缩放模型测试进行了1G条件下的土壤 - 钢管板桩（SPSP）基础系统的有效基础输入运动（EFIM）的实验研究。具有20桩的缩放模型一起互锁以形成圆形组件，嵌入嵌入层压剪切盒中的干燥内聚力轧件。所有桩的尖端在剪切箱的底部刚性螺栓固定在剪切箱的底部，而头部刚性地连接到脚。在动态地面激发下获得SPSP基础模型的基础级别的幅度和频率相关的eFIM。进行的实验包括一系列低于高振幅的横向谐波地励磁，覆盖土壤的弹性到不弹性行为。结果表明，由于装载幅度的增加导致土壤增加导致土壤的增加导致土壤的增加导致土壤的幅度增加，SPSP基础水平的振幅和土壤 - SPSP基础系统的谐振频率降低降低菌株并因此降低土壤刚度。结果也以运动相互作用因子（KIF）的形式获得。该KIF被发现大约等于土壤 - SPSP基础系统的谐振频率的统一，然而，反映了土壤 - SPSP运动相互作用的谐振频率的谐振频率降低。对于更高的激励幅度，对于相当数量的频率，特别是围绕下频率区域，观察到KIF（比统一）的增加。这可以归因于由于升高的激发幅度而在土中诱导的非线性。

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