Coupling beams between shear walls are one of the key elements for energy dissipation in tall buildings. A representative mathematical model of coupling beam should represent flexure, shear and interface slip/extension mechanisms simultaneously. This goal can be achieved by using either detailed finite element models or by using macro models. This paper presents a review of various macro model alternatives for diagonally reinforced coupling beams in the literature. Three distinct methods have been reviewed in terms of their modeling techniques, the cyclic response overlap and the amount of cumulative plastic energy dissipated based on the results of previously performed tests. Through an analytical study, adequately accurate results can be captured by using macro models, although they are simpler in practice compared to sophisticated micro models. This study shows that, by modifying ultimate shear capacities where concrete material between diagonal bundles is adequately confined, it is possible to capture a more realistic result and a better approximation to the actual responses. It is also concluded that a simpler numerical model for diagonally reinforced coupling beams can be achieved by introducing linear part of slip/extension behavior into elastic part of the beam. It is observed, as a result of this study, that the ratio of effective stiffness to that of the gross cross-sectional one ranges from 0.04 to 0.14 in diagonally reinforced coupling beams depending on the aspect ratio and the beam strength parameters.
LINK
''This research aims to address a post-earthquake urgent strengthening measure to enhance the residual seismic capacity of earthquake-damaged reinforced concrete wall structures with coupling beams. The study consists of a series of tests on half-scale prototype coupling beams with various detailing options, including confined with reduced confinement, partially confined, and unconfined bundles, under cyclic loading conditions. The methodology employed involved subjecting the specimens to displacement-controlled reversal tests, and carefully monitoring their response using strain gauges and potentiometers. The main results obtained reveal that GFRP wrapping significantly enhances the seismic performance of earthquake-damaged coupling beams, even in cases where specimens experienced strength loss and main reinforcement rupture. The strengthened beams exhibit commendable ductility, maintaining high levels of deformation capacity, and satisfying the requirements of relevant seismic design codes. The significance of the study lies in providing valuable insights into the behavior and performance of damaged coupling beams and assessing the effectiveness of GFRP wrapping as a rapid and practical post-earthquake strengthening technique. The findings can be particularly useful for developing urgent post-earthquake strengthening strategies for high-rise buildings with structural walls. The method may be particularly useful for mitigating potential further damage in aftershocks and eventual collapse. In conclusion, this study represents a significant advancement in understanding the post-earthquake behaviors of coupling beams and provides valuable guidance for practitioners in making informed decisions regarding post-earthquake strengthening projects. The findings contribute to the overall safety and resilience of structures in earthquake-prone regions.''
DOCUMENT
Human capital and social capital are crucial in shaping entrepreneurial decisions, yet their combined effects on entrepreneurship entry remain insufficiently explored. This study uses data from the China Household Tracking Survey (2010–2018) to examine how the coupling of human and social capital influences entrepreneurship entry. By defining human-social capital coupling as the interdependence between these two forms of capital, we estimated its nonlinear impact using generalized propensity score matching and analyzed variations across gender and region. The results revealed that human capital-social capital coupling mediated the relationship between these capitals and entrepreneurship entry, following a significant N-shaped trend with identified thresholds. The impact of this coupling was also influenced by gender and regional variations. The study contributes to the literature by introducing a novel perspective on capital coupling, assessing its threshold effects, and highlighting gender and regional disparities. Individuals should understand and use the human capital-social capital coupling to guide their actions; policymakers are encouraged to consider and enhance the coupling between human and social capital in their entrepreneurship support strategies.
DOCUMENT
The concept of business sustainability has been investigated, reviewed, and criticized by a plethora of scholars. What constitutes the essence of business sustainability—and its relationship to the actual state of our planet—is still an integral part of the discourse on business-society relations. Recently, Dyllick and Muff (Organization & Environment, 29:156–174, 2016) have reviewed literature in order to uncover what constitutes ‘true’ business sustainability, explaining the apparent absence of a coupling between corporate sustainability initiatives and the state of the planet and explore how this coupling can be strengthened. As such, the authors provide many relevant pointers for answering the question: when is business truly sustainable? This paper aims to respond both critically and constructively to Dyllick and Muff’s article by addressing three points: the somewhat confusing conception of what actually comprises ‘true’ business sustainability, the authors’ choice not to address the underlying economic model and the model of consumer behavior, and the types of sustainability intelligence that, in our view, business needs to develop to truly become a force for spurring sustainable development. We use the Sustainable Development Goals (SDGs) as a case in point to illustrate our argument. In doing so, this paper aims to add to a firm-centered conceptualization of the business-society interface in a constructive way to stimulate further discourse on the concept, and to make a theoretical contribution with respect to coupling mechanisms in the realm of business sustainability.
LINK
From the article: "Axiomatic Design and Complexity Theory as described by Suh focus heavily on the coupling often found in functional requirements. This is so fundamental to the analysis of the design that it is the core of the Axiom of Independence which examines the coupling between functional requirements due to chosen design parameters. That said, the mapping between customer needs and functional requirements is often overlooked. In this paper we consider coupling, found due to this mapping, as a possible source of complexity in terms of a user interface to a designed product. We also re-examine the methodology of how customer needs are generated and translated into the other domains to understand how they can give further insight into the customer mindset. Based on this analysis, we believe customer domain complexity should always be examined in design that includes end-user interaction."
MULTIFILE
Based on the theory of embodied cognition we developed NOOT, at tangible tool that allows marking audio-moments during creative sessions. A detailed analysis of using NOOT in practice lead to a reconceptualization of NOOT within processes of external scaffolding. It also spurred a new design project focused on reflection during group sessions
DOCUMENT
Wat is de rol van prijs in duurzaam consumentengedrag? ‘Omdat het te duur is’ is een veelgehoord argument wanneer mensen wordt gevraagd waarom ze geen duurzame producten kopen. Maar is dat werkelijk zo, of is dit een makkelijk alibi van mensen om niet hun gedrag te hoeven veranderen? We zijn over het algemeen niet bepaald armlastig in de westerse wereld, dus is het werkelijk een gebrek aan geld, of is er een andere oorzaak van dit gedrag? Om daar een uitspraak over te kunnen doen, hebben we de literatuur onderzocht op de relatie tussen prijs en duurzaamheid. Overall conclusie: een bepaalde groep mensen geeft in onderzoeken aan best bereid te zijn om meer te betalen voor duurzamere oplossingen, tot wel 29%. Maar sociale wenselijkheid speelt daarbij waarschijnlijk een grote rol. Want gezien het nog geringe marktaandeel van duurzame producten is de realiteit weerbarstiger. De meerderheid van de mensen is kennelijk nog niet zodanig overtuigd van de meerwaarde dat ze er ook extra geld voor over hebben. Dit document is opgedeeld in twee secties: 1. sectie 1 beschrijft een analytische beschouwing van de literatuur. Dit onderzoek schetst de ontwikkeling van de artikelen die tot dusverre gepubliceerd zijn over bereidheid van consumenten om een meerprijs te betalen voor duurzame producten; 2. sectie 2 beschrijft een inhoudelijke beschouwing van een selectie van de literatuur: specifiek artikelen die (experimenteel) onderzoek beschrijven naar de willingness to pay voor duurzame producten en diensten.
DOCUMENT
This investigation explores relations between 1) a theory of human cognition, called Embodied Cognition, 2) the design of interactive systems and 3) the practice of ‘creative group meetings’ (of which the so-called ‘brainstorm’ is perhaps the best-known example). The investigation is one of Research-through-Design (Overbeeke et al., 2006). This means that, together with students and external stakeholders, I designed two interactive prototypes. Both systems contain a ‘mix’ of both physical and digital forms. Both are designed to be tools in creative meeting sessions, or brainstorms. The tools are meant to form a natural, element in the physical meeting space. The function of these devices is to support the formation of shared insight: that is, the tools should support the process by which participants together, during the activity, get a better grip on the design challenge that they are faced with. Over a series of iterations I reflected on the design process and outcome, and investigated how users interacted with the prototypes.
DOCUMENT
Background: Training load is typically described in terms of internal and external load. Investigating the coupling of internal and external training load is relevant to many sports. Here, continuous kernel-density estimation (KDE) may be a valuable tool to capture and visualize this coupling. Aim: Using training load data in speed skating, we evaluated how well bivariate KDE plots describe the coupling of internal and external load and differentiate between specific training sessions, compared to training impulse scores or intensity distribution into training zones. Methods: On-ice training sessions of 18 young (sub)elite speed skaters were monitored for velocity and heart rate during 2 consecutive seasons. Training session types were obtained from the coach’s training scheme, including endurance, interval, tempo, and sprint sessions. Differences in training load between session types were assessed using Kruskal–Wallis or Kolmogorov–Smirnov tests for training impulse and KDE scores, respectively. Results: Training impulse scores were not different between training session types, except for extensive endurance sessions. However, all training session types differed when comparing KDEs for heart rate and velocity (both P < .001). In addition, 2D KDE plots of heart rate and velocity provide detailed insights into the (subtle differences in) coupling of internal and external training load that could not be obtained by 2D plots using training zones. Conclusion: 2D KDE plots provide a valuable tool to visualize and inform coaches on the (subtle differences in) coupling of internal and external training load for training sessions. This will help coaches design better training schemes aiming at desired training adaptations.
DOCUMENT
