Milad Aghamolaei, Alireza Saeedi Azizkandi, Ali Abolhasanpoor
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引用次数: 0
摘要
土壤和桩的相互作用会对系统的响应产生重大影响,因此在设计时应加以考虑。为了解决一些不确定因素,我们进行了一系列 1 g 振动台试验,然后进行了数值模拟,以解决嵌入干砂中的自由头单桩在地震波作用下的地震响应问题,其中水平加速度和弯矩是主要指标。随后,利用经过验证的数值模型进行参数研究,重点研究基于土壤剖面类型的归一化诱导运动力。数值结果表明,土壤剖面类型不仅极大地影响了最大归一化地震力的振幅,而且这些响应参数的分布也与土壤类型密切相关。结果还表明,忽略土-桩界面的滑动和/或分离会导致最大归一化运动弯矩和剪力被低估,低估幅度分别高达 17.5% 和 70%。土壤类型对诱导力的影响也达到 60%左右,这表明其设计后果可能非常严重。因此,可以得出结论,滑移和/或分离的影响可能相当大,因此应加以考虑,以防止地震地区可能出现的破坏。
Kinematic Internal Forces of Free-Head Single Piles Subjected to Seismic Loading: Shaking Table Testing and Numerical Simulation
Soil and pile interaction could significantly contribute to the response of the system and should be considered in the design prospect. To address some of the uncertainties, a series of 1 g shaking table tests followed by numerical simulations were conducted to address the seismic response of free-head single piles embedded in dry sand subjected to seismic waves of which horizontal acceleration and bending moments are the prime indexes. Subsequently, the validated numerical model was employed to perform parametric studies, focusing on normalized induced kinematic forces based on the soil profile type. The numerical results showed that not only does the soil profile type considerably affect the amplitudes of the maximum normalized seismic forces but also the distributions of these response parameters are highly dependent on soil type. The results also demonstrated that neglecting slippage and/or separation along the soil–pile interface leads to underestimation of the maximum normalized kinematic bending moment and shear force by up to 17.5% and 70%, respectively. Soil type also affects the induced forces by about 60% indicating that the design consequence of which could be dire. Therefore, it is concluded that the effects of slippage and/or separation can be considerable and hence, should be taken into consideration to prevent probable damages in seismic areas.
期刊介绍:
International Journal of Civil Engineering, The official publication of Iranian Society of Civil Engineering and Iran University of Science and Technology is devoted to original and interdisciplinary, peer-reviewed papers on research related to the broad spectrum of civil engineering with similar emphasis on all topics.The journal provides a forum for the International Civil Engineering Community to present and discuss matters of major interest e.g. new developments in civil regulations, The topics are included but are not necessarily restricted to :- Structures- Geotechnics- Transportation- Environment- Earthquakes- Water Resources- Construction Engineering and Management, and New Materials.