The lack of in-depth understanding of the seismic behavior and ductility of precast concrete structures makes it difficult to reach to ductility demand which could be exhibited during an earthquake. The limitations are mainly related to the beam-to-column connections as the main load transfer paths. Two distinct exterior beam-column connections made of normal-strength concrete are investigated experimentally. Both dry and wet type installment techniques are used in the industrial type joints while the residential type joints are wet connections. The specimens are subjected cyclic displacement reversals in order to obtain information on strength, stiffness and ductility characteristics of the connection details. The preliminary design of the joints has been updated during the tests based on the damages observed, thus a set of improved specimens have also been built and tested, and a relatively better performance is obtained expectedly. The industrial and residential types of connections showed stable load-displacement cycles with high energy dissipation up to structural drift of 2%, though a significant level of pinching and deterioration of the critical section have occurred at around 3% drift level. The tested specimens have been numerically modeled to calibrate the analytical tools, and a satisfactory approximation has been obtained between experimental and numerical results.
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09/04/2015The seismic assessment of the out-of-plane (OOP) behaviour of unreinforced masonry (URM) buildings is essential since the OOP is one of the primary collapse mechanisms in URM buildings. It is influenced by several parameters, including the poor connections between structural elements, a weakness highlighted by post-earthquake observations. The paper presents a mechanical model designed to predict the contributions of various resisting mechanisms to the strength capacity of timber-joist connections in masonry cavity walls. The research presented in this paper considers two different failure modes: joist-wall interface failure, and OOP rocking behaviour of the URM walls. Consequently, two mechanical models are introduced to examine these failure modes in timber-joist connections within masonry cavity walls. One model focuses on the joist-wall interface failure, adopting a Coulomb friction model for joist-sliding further extended to incorporate the arching effect. The other model investigates the OOP rocking failure mode of walls. The combined mechanical model has been validated against the outcomes of an earlier experimental campaign conducted by the authors. The considered model can accurately predict the peak capacity of the joist connection and successfully defines the contribution of each mechanism in terms of resistance at failure.
Are migrant entrepreneurs innovative with their business ideas and practices? The introduction of novel business ideas would provide migrant entrepreneurs with a cutting edge advantage against competitors, but the research about this topic is thin on the ground. I propose that the opportunity of migrant entrepreneurs to introduce an innovation is better understood by a closer look at the business idea itself and to which extent it is innovative; by considering the contextual factors where the opportunity structure influences the development of migrant businesses; and by the existence of social connections to share resources and information among entrepreneurs. Such complementary concepts - combining the interaction of the social, human, cultural and financial resources of individual migrants in relation to the wider opportunity structure - provide a comprehensive understanding of the opportunity for entrepreneurs to innovate. By using those contributions as conceptual building blocks, I propose the use of innovativeness levels for migrant entrepreneurs following the processes of adaptation and massification of goods and services introduced by migrants over time. This article builds from existing frameworks: contributions about the definitions and typology of innovation; the mixed-embeddedness approach, which has been largely used to study the opportunity structure; and the model of diffusion of innovations which pays a larger attention to the product and the agency of actors.
In recent years, ArtEZ has worked on a broadly supported strategic research agenda on the themes New Ecologies of Matter (ecological challenges), Social Equity (social-societal issues), (Un)Learning Practices (educational innovations) and (Non)CybernEtic Fabric (technological developments). Building on these strategic themes, the ArtEZ Research Collective as developed an international research strategy to become a valuable partner in the relevant Horizon Europe (HEU) areas of Environment, Industry and Social science and humanities. With its specific knowledge position and approach from arts and creativity, ArtEZ is convinced that it can play a distinctive role in European consortia to tackle various challenges in these areas, in particular from the perspective and research topics of the professorships Fashion and Tactical Design. To achieve its ambitions and goals in its targeted research topics, ArtEZ is convinced that a combination of international connections and local applications is key for successful impact. Building upon existing relations and extending the international research position requires extra efforts, e.g., by developing a strong international framework of state-of-the-art research results, impacts and ambitions. Therefore ArtEZ needs to (further) build on both its international network and its supportive infrastructure. With this proposal ArtEZ is presenting its goals and efforts to work on its international recognition as a valuable research partner, and to broaden its international network in cutting-edge research and other stakeholders. With regards to its supporting infrastructure, ArtEZ has the ambition to expand the impact of the Subsidy Desk to become a professional partner to the professorships. This approach requires a further professionalization and extension of both the Subsidy Desk organization and its services, and developing and complementing skills, expertise and competences to comply to the European requirements.
The postdoc candidate, Giuliana Scuderi, will strengthen the connection between the research group Biobased Buildings (BB), (collaboration between Avans University of Applied Sciences and HZ University of Applied Sciences (HZ), and the Civil Engineering bachelor programme (CE) of HZ. The proposed research aims at deepening the knowledge about the mechanical properties of biobased materials for the application in the structural and infrastructural sectors. The research is relevant for the professional field, which is looking for safe and sustainable alternatives to traditional building materials (such as lignin asphalt, biobased panels for bridge constructions, etc.). The study of the mechanical behaviour of traditional materials (such as concrete and steel) is already part of the CE curriculum, but the ambition of this postdoc is that also BB principles are applied and visible. Therefore, from the first year of the programme, the postdoc will develop a biobased material science line and will facilitate applied research experiences for students, in collaboration with engineering and architectural companies, material producers and governmental bodies. Consequently, a new generation of environmentally sensitive civil engineers could be trained, as the labour market requires. The subject is broad and relevant for the future of our built environment, with possible connections with other fields of study, such as Architecture, Engineering, Economics and Chemistry. The project is also relevant for the National Science Agenda (NWA), being a crossover between the routes “Materialen – Made in Holland” and “Circulaire economie en grondstoffenefficiëntie”. The final products will be ready-to-use guidelines for the applications of biobased materials, a portfolio of applications and examples, and a new continuous learning line about biobased material science within the CE curriculum. The postdoc will be mentored and supervised by the Lector of the research group and by the study programme coordinator. The personnel policy and job function series of HZ facilitates the development opportunity.
The recently established BUas Research & Graduate School has been set up to facilitate and coordinate both in-domain and cross-domain research projects. One of its ambitions is to connect our expertise on Digital Realities (DR) with our other research domains. This will give all domains a better position to contribute to the European ambition to create “a Europe fit for the digital age”. Additionally, the project will enable the SPRONG group DIGIREAL-XL to strengthen its visibility and reputation on a European level. Connecting with the European VR/AR Coalition will be an important step to achieve this goal, in combination with activities for extending our European network for DR applications. Key deliverable will be a grant proposal for the new European VR/AR-Lab, in which we combine our DR expertise with our specialized knowledge in other domains (e.g. entertainment, culture, tourism and education). The ultimate goal is to establish a more coherent and focused research portfolio, and reach a better position to contribute to a greener, more digital and more resilient Europe.
