不规则锚固刚体摇晃脆弱性的随机分析:在墨西哥城土体中的应用

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
S. Ramos, C. Arredondo, E. Reinoso, M. Leonardo-Suárez, Marco A. Torres
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引用次数: 0

摘要

本文主要研究了考虑场地条件和墨西哥城地震活动性的不规则几何形状和非均匀质量分布的刚性锚固块体摇晃响应的预期损伤的开发和评估。考虑了约束体的非线性特性,对纯拉伸破坏机制和拉剪破坏机制进行了评价。使用基于物理的地面运动模拟,执行了一个概率框架,涵盖了广泛的块大小,长细比和偏心。为了考虑远场地震传播的不确定性对研究地点的地震危险性有重要贡献,采用小地震记录的随机求和方法模拟了一组情景,并将其视为经验格林函数(EGFs)。采用经车身长细归一化的最大块体旋转绝对值作为峰值地面加速度的函数作为工程需求参数(EDP)。结果表明:长细比在2 ~ 3之间锚固效果较好,长细比在4以上锚固效果较好;此外,在一定的峰值强度范围内,位于软土中的锚固块体相对于位于硬土中的锚固块体更不容易受到破坏。这里使用的程序允许对不同类型内容的风险,可靠性和弹性评估做出决策,并且很容易适应其他地震环境。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stochastic analysis of the rocking vulnerability of irregular anchored rigid bodies: application to soils of Mexico City
This paper focuses on the development and assessment of the expected damage for the rocking response of rigid anchored blocks, with irregular geometry and non-uniform mass distribution, considering the site conditions and the seismicity of Mexico City. The non-linear behavior of the restrainers is incorporated to evaluate the pure tension and tension-shear failure mechanisms. A probabilistic framework is performed covering a wide range of block sizes, slenderness ratios and eccentricities using physics-based ground motion simulation. In order to incorporate the uncertainties related to the propagation of far-field earthquakes with a significant contribution to the seismic hazard at study sites, it was simulated a set of scenarios using a stochastic summation methods of small-earthquakes records, considered as Empirical Green's Function (EGFs). As Engineering Demand Parameter (EDP), the absolute value of the maximum block rotation normalized by the body slenderness, as a function of the peak ground acceleration (PGA) is adopted. The results show that anchorages are more efficient for blocks with slenderness ratio between two and three, while slenderness above four provide a better stability when they are not restrained. Besides, there is a range of peak intensities where anchored blocks located in soft soils are less vulnerable with respect to those located in firm soils. The procedure used in here allows to take decisions about risk, reliability and resilience assessment of different types of contents, and it is easily adaptable to other seismic environments.
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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