Ultimate shear strength prediction model for unreinforced masonryretrofitted externally with textile reinforced mortar

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Earthquakes and Structures Pub Date : 2020-12-01 DOI:10.12989/EAS.2020.19.6.411

Athanasia K. Thomoglou, T. Rousakis, D. Achillopoulou, A. Karabinis

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引用次数: 8

Abstract

Unreinforced masonry (URM) walls present low shear strength and are prone to brittle failure when subjected to in-plane seismic overloads. This paper discusses the shear strengthening of URM walls with Textile Reinforced Mortar (TRM) jackets. The available literature is thoroughly reviewed and an extended database is developed including available brick, concrete and stone URM walls retrofitted and subjected to shear tests to assess their strength. Further, the experimental results of the database are compared against the available shear strength design models from ACI 549.4R-13, CNR DT 215 2018, CNR DT 200 R1/2013, Eurocode 6 and Eurocode 8 guidelines as well as Triantafillou and Antonopoulos 2000, Triantafillou 1998, Triantafillou 2016. The performance of the available models is investigated and the prediction average absolute error (AAE) is as high as 40%. A new model is proposed that takes into account the additional contribution of the reinforcing mortar layer of the TRM jacket that is usually neglected. Further, the approach identifies the plethora of different block materials, joint mortars and TRM mortars and grids and introduces rational calibration of their variable contributions on the shear strength. The proposed model provides more accurate shear strength predictions than the existing models for all different types of the URM substrates, with a low AAE equal to 22.95%.

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纺织增强砂浆外加固无筋砌体的极限抗剪强度预测模型

无筋砌体（URM）墙的抗剪强度较低，当受到平面内地震过载时，容易发生脆性破坏。本文讨论了织物增强砂浆（TRM）夹套对URM墙的抗剪加固。对现有文献进行了全面审查，并开发了一个扩展数据库，包括对现有的砖、混凝土和石头URM墙进行改造并进行剪切试验以评估其强度。此外，数据库的实验结果与ACI 549.4R-13、CNR DT 215 2018、CNR DT200 R1/2013、欧洲规范6和欧洲规范8指南以及Triantafillou和Antonopoulos 2000、Triantafilou 1998和Triantafillou 2016中的可用抗剪强度设计模型进行了比较。对现有模型的性能进行了研究，预测平均绝对误差（AAE）高达40%。提出了一个新的模型，该模型考虑了TRM导管架加固砂浆层的额外贡献，而这一贡献通常被忽略。此外，该方法确定了大量不同的砌块材料、接缝砂浆、TRM砂浆和格栅，并对其对抗剪强度的可变贡献进行了合理校准。对于所有不同类型的URM基底，所提出的模型比现有模型提供了更准确的剪切强度预测，低AAE等于22.95%。

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

Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

2.90

自引率

20.00%

发文量

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