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Tiago P.,ECA Projectos Lda | Tiago P.,Polytechnic Institute of Coimbra | Julio E.,ISISE Institute for Sustainability and Innovation in Structural Engineering | Julio E.,University of Coimbra
Engineering Structures | Year: 2010

In 2000, due to a substantial landslide, the reinforced concrete (RC) structure of a residential building located in Coimbra, Portugal, was severely damaged. The first two levels of three columns were completely destroyed and, as a result, part of the building supported by these, with a dimension in plant of 9.5×6.7 m2, became a 7.0 m span cantilever with 12 stories.In this paper, the authors describe the following: the accident; the preliminary assessment of structural conditions; the immediate intervention; the strategy adopted to consolidate the damaged structure; the repair and strengthening works; the loading procedure of the rebuilt part of the structure; and the finishing operations. Some final remarks are also presented, including a proposal for robustness analysis. © 2010 Elsevier Ltd.


Granja J.L.,ISISE Institute for Sustainability and Innovation in Structural Engineering | Azenha M.,ISISE Institute for Sustainability and Innovation in Structural Engineering | De Sousa C.,ISISE Institute for Sustainability and Innovation in Structural Engineering | Faria R.,University of Porto | Barros J.,ISISE Institute for Sustainability and Innovation in Structural Engineering
Journal of Advanced Concrete Technology | Year: 2014

The use of embedded relative humidity (RH) sensors for assessing the internal humidity in concrete is widely spread, dully backed by existing standards. Even though the approaches adopted in the literature seem to have several differences between each other, few or none research works were found to focus on the comparison of performance of sensors and methods for RH measurement. In view of this, several sets of experiments comparing the performances of different sensors and monitoring procedures will be presented in this paper, discussing the main findings and providing recommendations for the strategies to be adopted in what concerns the measurement technique. The main points addressed in this work are: (i) comparisons between readily available systems for RH measurement in concrete, as well as custom measurement strategies reported in the literature; (ii) issues related to calibration procedures and re-calibration necessity; (iii) relevance of the existence of an interface porous material between the embedded sensor and the measurement spot in concrete; (iv) importance of the size of the embedment body into which the RH sensor is inserted; (v) equivalence of results obtained when the probe is constantly inserted into the embedment body, or placed inside it at discrete instants. Copyright © 2014 Japan Concrete Institute

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