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O Instituto Superior Técnico, em parceria com as Escolas do Ensino Superior Universitário e Politécnico, organizou o 2º Simpósio de Engenharia Civil (2SEC 2023), que decorreu a 3 de maio de 2023. O evento teve como principais objetivos: Divulgar os trabalhos académicos concluídos em 2021 ou 2022 pelos estudantes de Licenciatura e Mestrado em Engenharia Civil, entre as várias escolas do país e no meio empresarial. Incentivar a troca de experiências, reflexão e discussão entre os estudantes finalistas/recém-diplomados, bem como a interação entre as escolas nacionais de Engenharia Civil. Promover o contacto entre estudantes finalistas/recém-diplomados e as empresas empregadoras. No evento participaram 28 Escolas de Engenharia de Portugal, representadas por 32 membros que constituíram a Comissão Organizadora e 28 membros que integraram a Comissão Científica. O presente Livro de Atas contém os 85 resumos, distribuídos em 14 Áreas Temáticas, que foram submetidos e aprovados pela Comissão Científica.

The preservation and safeguarding of built cultural heritage is a permanent concern for institutions. These structures were generally poorly prepared for movement triggered by natural disasters, a situation further complicated in the case of earthquakes, as each building has a unique structural dynamic linked to its geometry, materials, method of construction and environmental conditions. The use of structural health monitoring (SHM) systems integrating monitoring techniques as well as inspection and structural analyses has gained great relevance in the appearance of low-cost IoT (Internet of Things) sensors on the market. In this paper, an IoT BIM-based solution is presented for real-time monitoring using low-cost sensors in the scope of building SHM systems. The case study takes place at the central body of the Palace of Monserrate, one of the most distinguished elements of the Cultural Landscape of Sintra. An H-BIM model was created in Autodesk Revit® software (version 2022 and 2023) based on a point cloud, and used as the basis for the numerical model developed in 3MURI. A MeM low-cost sensor was installed on the third floor of the central tower of the Monserrate Palace in Sintra, and the data gathered were recorded in the H-BIM model. The capacity to acquire real-time information on a structure’s vibration, both during normal operation and after an extraordinary occurrence, could allow the application of more effective maintenance and repair practices, resulting in lower operating costs and allowing for the best management of built cultural heritage.

Existing heritage buildings can be especially vulnerable to earthquakes. They were designed only considering gravity loads and some of them are located in earthquake prone areas, such as the southwestern Iberian Peninsula. Besides, there is a high uncertainty in the definition of their constructive parameters and complex geometry. Due to that, it is paramount to develop accurate numerical models to obtain a reliable assessment of their seismic behaviour. Given this, the main objective of this manuscript is to analyse the seismic behaviour of the Giralda tower, located in Seville (Spain). It was declared as a Word Heritage Site of Outstanding Universal Value by the UNESCO in 1987. Seville has a moderate seismic hazard, but it has been shown that the soft alluvial strata amplify the seismic action. The tower has a brick and stone masonry structure, which was constructed in several construction phases. A 3D Finite Element Model of the tower has been developed using OpenSees software, employing a 3D CAD model. Modal analyses and nonlinear static analyses have been applied to calibrate and to assess the tower’s seismic behaviour. The results showed significant differences in function of the load pattern. It should be remarked that the boundary conditions have a notable effect upon getting a good calibration of the model. Regarding the damage, it has been found to match the historic records: the ramps would be ruined and, in the outer wall, it would be concentrated near the openings, especially close to the belfry.

INTRODUCTION: Fenestrated/branched EVAR (f/bEVAR) are associated with lower peri-operative major complications, when compared to open repair in complex aortic pathologies. However, f/bEVAR is limited by the waiting time for customized graft production and has specific anatomic limitations. Alternatively, adapting outside instructions-for-use, readily available off-the-shelf devices has been used with variable success. Among these options is the Octopus technique, which consists of parallel stent grafts originating inside a larger external stent graft. Despite being an off-label combination of devices, it can play a role when f/bEVAR is unavailable or inapplicable. METHODS: Single center retrospective study, including all consecutive patients treated with the Octopus technique. Baseline characteristics, peri-procedural and follow-up data was obtained. Primary endpoint is clinical success. Secondary endpoints are complications and secondary interventions in follow-up. RESULTS: Between 2015 and February 2022, six patients with a mean of 74±9 years were identified. Treatment indications included three type 1A endoleaks and 3 thoracoabdominal aortic aneurysms (TAAA) without prior intervention, one of which was mycotic. Four procedures were elective and the remaining two emergent. In the elective cases, the Octopus technique was chosen due to anatomical constraints and because waiting time for customization was considered excessive. Excluder and Incraft endografts were used in 5 and 1 cases, respectively. Thirteen visceral branches were revascularized (6 superior mesenteric, 4 renal and 3 celiac arteries). Gutter endoleaks were observed in 2 patients. Mean blood loss, surgery and hospitalization duration was 483 (300) mL, 288 (73) minutes and 26 (19.5) days. One perioperative death occurred, in a patient treated in the context of post- EVAR rupture due to type 1A endoleak. The most frequent postoperative complications were temporary acute renal failure (2/6), paraplegia (2/6) of which one was completely resolved, and non-graft related infection (2/6). One early reintervention, consisting of branch relining due to kinking and gutter embolization was necessary. On follow-up, there were no new endoleaks or endoleak-related interventions. Four patients died within two years, one with an aneurysm-related complication (spondylodiscitis in the context of a mycotic TAAA). The remaining deaths were not aneurysm related. CONCLUSION: The Octopus technique may offer a valuable off-the-shelf solution for complex aortic diseases, particularly due to anatomical constraints or in the emergent setting. Despite a high technical success rate, there is significant early morbidity and high mid-term mortality. In our series, durability was reasonable for this challenging group of patients, and our outcomes are in accordance with other reports., Angiologia e Cirurgia Vascular, Vol. 19 No. 1 (2023): March