Researcher List

Department of Architecture

Numerical Simulation of Hygrothermal and Fluid Design to Reduce Energy Consumption in City, Building and House for Proportion Effective Countermeasures to Avoid Global Warming

Distribution of heat load in a house (CFD simulation) (c)AYA NAKAGAWA (The University of Tokyo)
Distribution of heat load in a house (CFD simulation)
(c)AYA NAKAGAWA (The University of Tokyo)

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  1. Study of the heat and moisture properties of natural recycling materials that can be used with traditional techniques in Japan, to develop advanced design methods for house envelopes that maximize energy conservation.
  2. Study of hygrothermal regulation using moisture generated in interiors, to avoid viral infections and reduce allergic reactions that often result from excessively dry room interiors. It is important that improved regulation of humidity does not increase energy consumption.
  3. Investigations into heat, ventilation, and humidity are performed using computational fluid dynamics (CFD) simulations. CFD simulations help us develop prediction and control models for urban environments, improve the indoor thermal performance of buildings, engineer energy savings based on natural energy utilization, and so on.

Establishment of Rational Design Method for RCS joints

Establishment of Rational Design Method for RCS joints

In Japan, steel beam-reinforced concrete column joints have been the subject of considerable research and scrutiny, with a plethora of proposed details and experimental studies carried out on over 650 specimens by various laboratories to ensure seismic performance. However, a rational design method for steel beam-reinforced concrete column joints has not yet been established. The objectives of this study are to establish a rational design method based on a stress transferring mechanism and a resistance mechanism applicable to such joints, explored experimentally and theoretically.

Global Practice for Architects Today

Global Practice for Architects Today
Global Practice for Architects Today

Our laboratory works mainly on both practical research in various regions, and participation for competition and workshops. For example, we have passed the first phase of an international Design Competition for a Cyclone Shelter in Bangladesh. We have visited the site and interviewed people in the site village. For the second phase, we will prepare documentation. The existing Cyclone Shelter is a facility based on a solid form that is not enough comfortable. Research has determined that the southern area of Bangladesh needs more than 2,000 shelters that are safe, and can useful for their ordinary life. Our aim is to propose a new prototype of Cyclone Shelter which the village people will enjoy using and that maximizes the provision of safety throughout the year while supporting their future.

Reduction of Seismic Risk of Buildings in the Osaka Basin

Snapshot of computed responses of an eccentric building
Snapshot of computed responses of an eccentric building

A primary concern of our laboratory is the reduction of seismic risk for buildings in the Osaka Basin. Much progress in several research fields will be needed to achieve this goal. Now, we are investigating several specific research topics, such as how to improve seismic hazard analysis inside the basin, development of high-frequency (above 1Hz) strong motion simulation methods, identification of the dynamic parameters of buildings, and computation of dynamic responses using microtremor recording technologies.

Buckling Analysis of Single-Layer Space Frame

Snap-through buckling
Snap-through buckling

In the structural design of large-span roof structures, one of the important targets is to save weight. The single-layer space frame is a typical structure for lightweight roofs, since such designs can cover large spaces such as arenas with a roof of minimal weight. During the design of shallow single-layer space frames, the estimation of buckling loads is an important design factor. The figure shows a numerical result of a single-layer space frame buckling analysis. When the load reaches a critical value, part of the single-layer space frame collapses due to snap-through buckling. This kind of analysis helps us design practical structures that are safe as well as economical.

Place-Constructing, as Ordinary Human Behavior in Daily Living

?Thinking Architecture from the Viewpoint of EBS (Environmental Behavior Study)?
Workplaces for office workers can be thought as their 'second places', after their homes that are their 'first places'. On working days, people not only work at their workplaces, but also refresh themselves, or do personal things around their workplaces, and construct various spaces in the vicinity of their workplaces. Such spaces are their 'third places'. In my studies, these are investigated how people act to wake places familiar , how they adapt themselves to places and cultivate feeling at home. These activities are defined as 'Place-Constructing', from the viewpoint of EBS (Environmental Behavior Study), and I have clarified the following points.

First, people often construct 'third places' around their workplaces and homes, near commuting routes, wherever they go in daily living. Second, junior high school and university students also construct 'third places' and 'comfortable places'. These points show the following hypothesis: People typically construct their places in the course of their daily living, because this activity efficiently improves their quality of life, whether consciously or not. This hypothesis is very important when we strive to design architecture, because architecture profoundly influences the quality of people's daily living, where we live, work, and play. This idea helps us to focus on the architect's raison d'etre. However, it is fascinating that most people design their personal architectures without architects, and construct their places that suit their daily living naturally. It is my work to study the variety of 'places' dynamically related to what people do in their daily living, to study architecture from the viewpoint of EBS, to verify or disprove hypotheses, and to consider what architecture should be.