AE propagation velocity calculation for stiffness estimation in Pier Luigi Nervi’s concrete structures

IF 1.1 Q4 MECHANICS

Curved and Layered Structures Pub Date : 2021-01-01 DOI:10.1515/cls-2021-0010

E. Lenticchia, A. Bertetto, R. Ceravolo

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引用次数: 1

Abstract

Abstract In the present paper, the acoustic emission (AE) device is used with an innovative approach, based on the calculation of P-wave propagation velocity (vp), to detect the stiffness characteristics and the diffused damage of in-service old concrete structures. The paper presents the result of a recent testing campaign carried out on the slant pillars composing the vertical bearing structures designed by Pier Luigi Nervi in one of his most iconic buildings: the Hall B of Torino Esposizioni. In order to investigate the properties of these inclined pillars, localizations of artificial sources (hammer impacts), by the triangulation procedure, were performed on three different inclined elements characterized by stiffness discrepancies due to different causes: the casting procedures, executed in different stages, and the enlargement of the hall happened a few years later the beginning of the construction. In the present work, the relationship between the velocity of AE signals and the elastic characteristics (principally elastic modulus, E) is evaluated in order to discriminate the stiffness level of the slanted pillars. The procedure presented made it possible to develop an innovative investigation method able to estimate, by means of AE, the state of conservation and the elastic properties and the damage level of the monitored concrete and reinforced concrete structures.

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基于声发射传播速度的桥墩混凝土结构刚度估计

摘要本文采用一种基于纵波传播速度(vp)计算的声发射(AE)装置来检测在役老旧混凝土结构的刚度特征和扩散损伤。本文介绍了最近对Pier Luigi Nervi在其最具代表性的建筑之一:都灵Esposizioni大厅B中设计的垂直承重结构的斜柱进行测试的结果。为了研究这些倾斜柱子的特性，通过三角测量程序，对三个不同的倾斜元素进行了人工源(锤击)的定位，这些元素由于不同的原因而具有刚度差异:浇铸过程，在不同阶段执行，大厅的扩建发生在施工开始的几年后。在本工作中，为了区分斜柱的刚度水平，评估了声发射信号的速度与弹性特性(主要是弹性模量，E)之间的关系。所提出的程序使开发一种创新的调查方法成为可能，该方法能够通过声发射来估计受监测的混凝土和钢筋混凝土结构的保存状态、弹性特性和损伤水平。

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

Curved and Layered Structures MECHANICS-

CiteScore

2.60

自引率

13.30%

发文量

审稿时长

14 weeks

期刊介绍： The aim of Curved and Layered Structures is to become a premier source of knowledge and a worldwide-recognized platform of research and knowledge exchange for scientists of different disciplinary origins and backgrounds (e.g., civil, mechanical, marine, aerospace engineers and architects). The journal publishes research papers from a broad range of topics and approaches including structural mechanics, computational mechanics, engineering structures, architectural design, wind engineering, aerospace engineering, naval engineering, structural stability, structural dynamics, structural stability/reliability, experimental modeling and smart structures. Therefore, the Journal accepts both theoretical and applied contributions in all subfields of structural mechanics as long as they contribute in a broad sense to the core theme.