SSI-induced seismic earth pressures on an integral abutment bridge model: Experimental measurements versus numerical simulations and code provisions

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-10-07 DOI:10.1002/eqe.4237
Gabriele Fiorentino, Raffaele De Risi, Flavia De Luca, George Mylonakis, Bruno Briseghella, Camillo Nuti, Anastasios Sextos
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Abstract

Integral abutment bridges (IABs) generate strong soil–structure interaction (SSI) effects due to their high structural stiffness and transmission of inertial and thermal loads generated at the deck directly to the abutments. Despite an increasing number of experimental and numerical studies available in the literature, there is a lack of consolidated methodologies to model dynamic SSI phenomena for IABs, particularly in seismic regions where uncertainties associated with the induced ground motions render the problem harder to tackle. This study proposes an advanced strategy to model the seismic response of IABs, accounting for dynamic interaction between the structure, the abutment and the foundation, including piles and earth retaining walls. To this end, detailed finite-element studies were carried out employing OpenSees to simulate a recent experimental campaign on a scaled IAB model in a soil container (SERENA) carried out at EQUALS Lab, University of Bristol, in the framework of SERA/H2020 project. An extensive dataset in terms of recorded accelerations, displacements, strains and settlements are available from these tests, including earth pressures which are back-calculated from bending strain measurements. The objectives of this paper are threefold: firstly, the model parameters are explored and assessed critically by comparing the results from the numerical simulations against the experimental data; secondly, once the model is deemed sufficiently representative of the experiments, earth pressures are obtained numerically, as these are not directly measured in the tests; thirdly, the estimated static and dynamic earth pressures on the abutment wall are compared with the predictions of two simplified analytical procedures currently under consideration for inclusion in the new Eurocode 8. The results indicate that records and predictions match well for frequencies of up to 40 Hz at model scale (about 8 Hz in prototype scale) and confirm that the proposed modelling strategy can be used in practical applications. The quasi-elastic model proposed in this study is shown to provide dependable predictions for cases involving moderate strains in real-life applications.

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SSI 对整体式桥墩模型造成的地震土压力:实验测量与数值模拟和规范规定的对比
整体式桥墩(IAB)由于结构刚度高,桥面产生的惯性荷载和热荷载直接传递到桥墩,因此会产生强烈的土-结构相互作用(SSI)效应。尽管文献中的实验和数值研究越来越多,但仍缺乏综合的方法来模拟 IAB 的动态 SSI 现象,尤其是在地震地区,与诱导地面运动相关的不确定性使问题更加难以解决。本研究提出了一种先进的工字钢建筑地震响应建模策略,考虑了结构、基台和地基(包括桩基和挡土墙)之间的动态相互作用。为此,在 SERA/H2020 项目框架内,布里斯托尔大学 EQUALS 实验室采用 OpenSees 对土壤容器(SERENA)中的按比例工字钢模型进行了详细的有限元研究。从这些试验中可获得大量数据集,包括记录的加速度、位移、应变和沉降,以及根据弯曲应力测量反向计算的土压力。本文的目的有三:首先,通过将数值模拟结果与试验数据进行比较,对模型参数进行探讨和严格评估;其次,一旦认为模型足以代表试验结果,则通过数值方法获得土压力,因为试验中无法直接测量土压力;第三,将估算的基台上静态和动态土压力与目前正在考虑纳入新版欧洲规范 8 的两种简化分析程序的预测结果进行比较。结果表明,在模型规模下,记录和预测的频率最高可达 40 Hz(原型规模下约为 8 Hz),两者吻合度很高,证实了所提出的建模策略可用于实际应用中。本研究提出的准弹性模型可为实际应用中涉及中等应变的情况提供可靠的预测。
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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
期刊最新文献
Issue information Issue information SSI-induced seismic earth pressures on an integral abutment bridge model: Experimental measurements versus numerical simulations and code provisions Estimation of inelastic displacement ratio spectrum for existing RC structures via displacement response spectrum Linear equivalence for motion amplification devices in earthquake engineering
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