Paulo B. Lourénço

University of Minho

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A project contribution to the development of sustainable multi-storey timber buildings

Catarina V. Silva Jorge M. Branco Paulo B. Lourénço

Wood is a natural material, renewable, easily recyclable, and able to store carbondioxide, which makes tall timber buildings a solution with potential to answer the main sustainability targets. Cross laminated timber (CLT) has been pointed out as the best wood-based material to make this ambition a real thing. In order to understand why, this paper introduces the material and describe some demonstration buildings recently built. Based on diagnosed weaknesses of CLT buildings, it is presented an initial propose for a new CLT/glulam hybrid construction system, called Urban Timber (UT) system, which aims be able to support taller timber buildings. The main motivation was the development of a wood-based structural solution that provides more spatial flexibility and wider versatility for visual architectural expressions. The system is described and illustrated, considering concerns related with structural behavior, architectural value, structural connections and wood shrinkage. Chapter 5 Innovative Construction Systems

Cross laminated timber

Structural system

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Citations (6)

Operational modal analysis of historical constructions using commercial wireless platforms

Structural Health Monitoring (2010)

Luís F. Ramos Rafael Aguilar Paulo B. Lourénço

Operational modal analysis is currently applied in structural dynamic monitoring studies using conventional wired-based sensors and data acquisition platforms. However, this approach becomes inadequate in cases in which aesthetic concerns arise (e.g., in cultural heritage buildings) or in which the use of wires greatly impacts the monitoring system cost and creates difficulties in the maintenance and deployment of the data acquisition platforms. In these cases, the use of a WSN and MEMS would clearly benefit the applications. This work illustrates an attempt to apply the wireless technology for the structural health monitoring of historical masonry constructions in the context of operational modal analysis. The article presents the state of the art of the wireless monitoring systems making a review of the applications in the civil engineering field. Subsequently, commercial wireless-based platforms and conventional wired-based systems are applied to study one laboratory specimen and one structural element from a 15th Century building located in Portugal. The results achieved in this study showed that, in comparison to the conventional wired sensors, the commercial wireless platforms have poor performance with respect to the acceleration time series recorded and the detection of modal shapes. However, reliable results were obtained for the measured frequencies.

Structural Health Monitoring

Operational Modal Analysis

10.1177/1475921710388973

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Citations (30)

Análise experimental de pilares de betão armado reforçados com laminados de carbono sob acções cíclicas

Joaquim A. O. Barros Sena Cruz Débora Ferreira Paulo B. Lourénço

Recentemente foi proposto um sistema constituido por laminados de fibras de carbono com seccao transversal de 10×1.5mm embutidos no betao de recobrimento das faces do elemento do pilar ortogonais ao plano de actuacao das cargas. Por intermedio de ensaios experimentais constatou-se que este sistema de reforco permite aumentar significativamente a capacidade de carga de pilares com modos de rotura por flexao. Aliando a este facto a rapidez de execucao e a economia de material, conclui-se ser uma alternativa eficaz as convencionais tecnicas de reforco para pilares com modos de rotura por flexao.

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Citations (1)

Relatório da inspeção estrutural da capela Nossa Senhora dos Matos, em Mouriscas – Abrantes

Luís F. Ramos Thiago Capistrano Miranda Paulo B. Lourénço

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In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

International Journal of Structural Glass and Advanced Materials Research (2018)

Farhad Akhoundi Graça Vasconcelos Paulo B. Lourénço

Masonry has a widespread use in the construction of the buildings even in reinforced concrete or steel frames. Past earthquakes have demonstrated the vulnerability of masonry infills resulted in the human life losses and economic costs. Recently innovative strengthening techniques such as Textile Reinforced Mortar technique (TRM) is used for enhancing the seismic response of the infills. Different procedures were suggested to enhance the bond between rendering mortar of the TRM technique and infilled frame to prevent its detachment. In this study commercial glass fiber shear connectors were used for connecting the TRM layer to the infilled frame and their response were investigated by testing the samples in the in-plane direction. The quasi static in-plane test was performed cyclically on two specimens; one without strengthening layer and another strengthened with commercial textile meshes. The results showed that TRM technique enhances the in-plane response of the infilled frames but the effectiveness of the shear connectors could be improved using proper materials.

10.3844/sgamrsp.2018.1.14

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Citations (13)

Monitoring and Preventive Conservation of the Historical and Cultural Heritage: the HeritageCare Project

Luís F. Ramos Maria Morais Miguel Azenha Giovanna Masciotta Teresa Cunha Ferreira

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A Simplified Approach to Estimate Seismic Vulnerability and Damage Scenarios Including Site Effects. Application to the Historical Centre of Horta, Azores, Portugal

Journal of Earthquake Engineering (2023)

Nicola Chieffo Tiago Miguel Ferreira Romeu Vicente Paulo B. Lourénço Antonio Formisano

ABSTRACTThe research attempts to provide a method for evaluating the susceptibility of heritage buildings and potential damage considering local site effects, using as a case study an urban sector situated in Horta, Faial, Azores, Portugal. The physical vulnerability of the investigated structures was appraised using an index-based method devised for structural masonry aggregates to emphasize their likelihood of seismic damage. As a result, a damage scenario based on real accelerograms collected after the 1998 Azores seismic event was developed by using a reliable seismic intensity prediction equation. In addition, the soil amplification, which increases the extent of seismic damage to the examined structures, is assessed by varying the soil conditions using EN 1998–1 Code. Thus, this research emphasises the ground impact in forecasting the expected damage scenarios, enabling optimised risk mitigation strategies in urban settings.KEYWORDS: Site-effectsvulnerability assessmentunreinforced masonry aggregatesdamage scenariosvulnerability curves Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference [UIDB/04029/2020], and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference [LA/P/0112/2020].

Vulnerability

Vulnerability index

10.1080/13632469.2023.2254399

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Citations (9)

Influence of conditioning of clay bricks over shear strength of brick masonry

Journal of Building Engineering (2023)

Carolina Briceño Miguel Azenha Graça Vasconcelos Paulo B. Lourénço

Cohesion (chemistry)

Brick

Immersion

Lime mortar

10.1016/j.jobe.2023.108138

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Citations (8)

Hygro-Thermo-Mechanical Analysis of Brick Masonry Walls: One-Way Coupling and Modelling Approaches

Rafael Arias Ramírez A. Jiménez-Ríos Bahman Ghiassi Paulo B. Lourénço

Brick

10.23967/eccomas.2024.155

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Exploring seismic fragility and strengthening of masonry built heritage in Lisbon (Portugal) via the Applied Element Method

Engineering Structures (2024)

Matteo Salvalaggio Vasco Bernardo Paulo B. Lourénço

Although mainland Portugal has been spared from large magnitude earthquakes in recent years, it faces a threat due to the presence of several active fault systems. In such a framework, Portuguese pre-code masonry construction is believed to be the most vulnerable in the existing building stock. Given the lack of information on earthquake damage to this stock, the use of detailed numerical models is a viable strategy to comprehend its seismic behavior. This paper provides an updated fragility characterization of Lisbon pre-code masonry buildings based on their seismic assessment through the Applied Element Method. To limit the computational time, a promising pushover strategy, known as Incremental Ground Acceleration, was adopted. After the characterization of the current fragility, two retrofit layouts based on piers strengthening were modeled and assessed for the building stock whose seismic capacity does not meet expected demand. The aim of the paper is to derive updated fragility curves for the Lisbon region to support risk analysis incorporating the latest hazard studies and to offer insights into potential retrofit interventions.

Unreinforced masonry building

10.1016/j.engstruct.2024.118890

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Citations (3)