考虑不同土壤场地中惯性和运动相互作用耦合的桩基支撑结构的地震响应

IF 2.9 3区 工程技术 Q2 ENGINEERING, CIVIL Frontiers of Structural and Civil Engineering Pub Date : 2024-08-19 DOI:10.1007/s11709-024-1113-z
Huiling Zhao, Fan Zhang
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引用次数: 0

摘要

土-桩-上部结构的动态相互作用对于了解地震多发地层中的桩基行为至关重要。评估桩的安全性需要确定由惯性和运动相互作用共同引起的地震弯矩,这具有挑战性。本文考虑到土壤的非线性,通过对不同土壤场地中的桩进行数值模拟来解决这一问题。结果表明,土壤场地的周期会对土壤、桩和结构之间的相互作用产生重大影响。软土和硬土场地的弯矩比中等土质场地的弯矩大一倍以上。桩的变形模式在硬土场地和软土场地之间表现出截然不同的特征。软土场地表现出一个单一的拐点,而硬土场地则表现出两个拐点。在软土地区,桩与土的运动相互作用会逐渐增加从桩尖到桩头的弯矩,上部结构的惯性相互作用影响较小。在硬土地区,土壤的惯性效应非常明显,在桩尖附近甚至超过了桩-土运动效应,从而导致了反向叠加弯矩。上部结构的惯性相互作用对硬土场地中的桩头影响显著。提出了一种简化的耦合方法,使用相关系数来表示惯性和运动相互作用。这些发现为了解土壤、桩和结构之间复杂的地震相互作用提供了启示。
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Seismic response of pile-supported structures considering the coupling of inertial and kinematic interactions in different soil sites

Dynamic soil–pile–superstructure interaction is crucial for understanding pile behavior in earthquake-prone ground. Evaluating the safety of piles requires determining the seismic bending moment caused by combined inertial and kinematic interactions, which is challenging. This paper addresses this problem through numerical simulations of piles in different soil sites, considering soil nonlinearity. Results reveal that the period of the soil site significantly affects the interaction among soil, piles, and structures. Bending moments in soft and hard soil sites exceed those in medium soil sites by more than twice. Deformation modes of piles exhibit distinct characteristics between hard and soft soil sites. Soft soil sites exhibit a singular inflection point, while hard soil sites show two inflection points. In soft soil sites, pile-soil kinematic interaction gradually increases bending moment from tip to head, with minor influence from superstructure’s inertial interaction. In hard soil sites, significant inertial effects from soil, even surpassing pile-soil kinematic effects near the tip, lead to reversed superposition bending moment. Superstructure’s inertial interaction notably impacts pile head in hard soil sites. A simplified coupling method is proposed using correlation coefficient to represent inertial and kinematic interactions. These findings provide insights into complex seismic interactions among soil, piles, and structures.

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来源期刊
CiteScore
5.20
自引率
3.30%
发文量
734
期刊介绍: Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.
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