Experimental and numerical analysis of the lateral response of full-scale bridge piers

Pavan Chigullapally, L. Hogan, L. Wotherspoon, M. Stephens, M. Pender
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引用次数: 1

Abstract

This paper presents the results of in-situ testing of two integrated pile-columns of a partially demolished bridge located in Auckland, New Zealand. A series of tests involving lateral monotonic pushover and subsequent dynamic free vibration snapback tests were used to quantify the variation in the stiffness and damping behaviour of the pile-column specimens over a range of lateral load levels. Each testing sequence consisted of incrementally increasing peak monotonic loads followed by the dynamic snapback, with a series of varying peak loads at the end of the testing sequence to evaluate the influence of loading history on the monotonic and dynamic response. The secant stiffness between the monotonic pushover tests performed to the same loading levels before and after the maximum load was applied, reduced by up to 40% in both the pile-columns, primarily due to soil gapping effects, highlighting the significant potential softening of the system prior to pile or column yielding. Progressive reduction in the damping of the system during each snapback test was evident, due to the varying contributions of different energy dissipation mechanisms, and the level of damping varied depending on the peak load applied. These results highlighted the significant influence of soil gapping and nonlinearity on the dynamic response of the system. Numerical models were developed in the open source structural analysis software OpenSeesPy using a Nonlinear Beam on Winkler Foundation approach to further investigate the response of the pile-columns. Models of both the pile-columns using existing p-y curves for clay soils showed good agreement with the experimental data in load-displacement, period and snapback acceleration time histories. Sensitivity analysis showed that the surface soft clay layer had a significant effect on the lateral response and dynamic characteristics of the model, reinforcing the need for good characterisation of the near surface soil profile to capture the behaviour of the system.
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全尺寸桥墩横向响应的试验与数值分析
本文介绍了新西兰奥克兰一座部分拆除的桥梁的两个整体桩柱的现场测试结果。使用了一系列试验,包括横向单调推挤和随后的动态自由振动回弹试验,以量化桩柱试样在一系列横向荷载水平上的刚度和阻尼性能变化。每个测试序列包括递增的峰值单调负载,然后是动态快速恢复,在测试序列结束时有一系列变化的峰值负载,以评估负载历史对单调和动态响应的影响。在施加最大荷载前后,对相同荷载水平进行的单调推倒试验之间的割线刚度,在两个桩柱中降低了高达40%,主要是由于土壤间隙效应,突出了在桩或柱屈服之前系统的显著潜在软化。由于不同能量耗散机制的不同贡献,在每次回弹测试期间,系统的阻尼逐渐降低是明显的,阻尼水平根据施加的峰值负载而变化。这些结果突出了土壤间隙和非线性对系统动态响应的显著影响。在开源结构分析软件OpenSeesPy中使用Winkler地基上的非线性梁方法开发了数值模型,以进一步研究桩柱的响应。使用粘土的现有p-y曲线的两个桩柱模型在荷载-位移、周期和回弹加速度时程方面与实验数据显示出良好的一致性。敏感性分析表明,表层软粘土层对模型的横向响应和动态特性有显著影响,这加强了对近地表土壤剖面进行良好表征以捕捉系统行为的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
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