大学図書館の大空間かつ負荷変動のある空間について空調計画を報告する。本計画は、学生が集い学修するためのラーニングコモンズという大空間がある。この空間は「試験会場」や「式典会場」としても利用できる空間とした。各利用形態による空調負荷変動に追従し、かつ省エネルギー性の高い空調計画となるよう、デシカント空調機と全面床吹出空調について検証した。デシカント空調機の省エネルギー性および全面床吹出空調による室内環境を確認した。

本研究の目的は効率的にタスク域を空調することです。 床吹出空調は温度ムラや室内設定温度にするための時間がかかるという課題がある。 解決方法として布製のソックダクトを採用し、タスク域を囲うようにOAパネル床下にソックダクトをループ状に設置した。 冷房・暖房における室内温熱環境と特性を実験検証した。

Roller chains are widely used for power transmission on many kinds of industrial machinery, including conveyors, cars, motorcycles, bicycles, and so forth. This study focuses on the fitting portion between the ring plate and the pin because the stress concentration of this connection sometimes causes final breakage. First, if shrink-fitting a pin to a plate, stress concentration occurs along the hole edge even under no external load. As a result of shrinkage fit of this pin, the stress concentration under external load is totally different from stress concentration of ordinary hole alone. Therefore, in this paper, as a fundamental model of the joint problem between a plate and a pin, an axisymmetric problem of a cylinder fitted in a hollow disk is studied. Then, the effect of chamfering on the hole edge of the hollow disk is discussed. Also, the e between the case where the hollow disk surface and the cylinder are the same surface and the case where the cylindrical end surface protrudes from the hollow disk are also clarified. The circumferential stress can be reduced by chamfering even when the cylinder does not protrude or protrude.

In this paper, the fatigue strength is considered for the roller chain which is composed of four components, that is, pin, bush, plate and roller. The finite element method (FEM) is applied to those components by focusing on the three states, which are the press fitting state, the static tensile state and the sprocket engaging state. Then, the stress amplitude and the average stress of each component are considered on the fatigue limit diagram. According to the analytical results, it is found that the fatigue crack initiation may start around the middle inner surface of the bush and also the inner plate has lower safety factor against fatigue fracture starting from the hole edge.

Seismic retrofitting for factories or warehouses with inadequate seismic performance can be hindered by operational disruptions and fire risks. This study introduces a novel method that involves attaching strengthening members to existing structures using high-strength bolts. Cyclic loading tests were conducted on braced frames with varying eccentricities to investigate the influence of the eccentricity and bolted connections. The test results indicate that an increase in brace eccentricity leads to a reduction in stiffness and strength of braced frame. Furthermore, the proposed structural model accurately evaluates the stiffness and strength of braced frames with eccentric braces.

Roller chains are commonly used for transmission of mechanical power on many kinds industrial machinery. Roller chain makers have done a lot of efforts to improve the wear resistance by using conventional types of wear testing machine. However, such conventional wear testing needs huge amount of time and cost. Therefore, this study focuses on developing a new wear testing machine, which can evaluate the wear amount efficiently without using main chain components such as inner plate, outer plate and roller. The experimental results show that this newly developed wear testing machine may realize the almost same wear rate under stable condition and similar wear status of the conventional chain type testing machine. The newly developed wear testing machine may be useful for improving the wear resistance of roller chains conveniently compared to the conventional chain type testing machine.

A new uncertainty analysis method is developed for planar frame structure models equipped with oil dampers of linear and nonlinear force-velocity relationships. The structural analysis software SNAP^® is collaborated with previously proposed uncertainty analysis method called NURP to obtain the maximum structural response when the damper characteristics are varied. In order to consider the uncertainties in the input, the critical double impulse is employed in addition to standard design ground motions, and we proposed the practical solution to use it in the structural analysis software. The validity of the proposed uncertainty method for frame structure models is investigated by comparing the result with maximum response derived by genetic algorithms. As a simplified method to evaluate the maximum value of the frame structure response, a method that uses a shear model equivalent to the frame structure model is also proposed.

When attaching members with high strength bolts, the filler plate is processed to have projections and is sandwiched between the new members to ensure the coefficient of slip without removing the paint film of the existing structure that contains lead. Considering that the bolts are subject to relaxation due to the paint film, we considered retightening and increasing the primary tightening axial force. A slip test was carried out to verify the slip strength of the filler plate with projections.

The design algorithm to obtain superior design solutions (SDSs) of steel office buildings associated with the different-type damping devices such as buckling restrained braces (BRBs) and oil dampers (ODs) is proposed. The SDSs are rational design solutions satisfying practical design constraints with the locally minimized structural cost. The design variables are the section sizes of columns and beams as well as locations and properties of the damping devices. The response history analyses are conducted during the optimization process directly evaluating the damping effect of ODs. The SDSs of 10 and 16-story buildings are derived and the structural properties are evaluated.

床吹出空調はタスク＆アンビエント空調の一種であり、ZEB化要素技術として注目されている。本報では、全面床吹出空調方式の吹出特性を把握するために、三次元超音波風速計を用いて、暖房時床吹出気流に対する多点計測を行い、床吹出気流の風速、風向および温度分布を確認した。更に、計測結果を用いてCFD解析を実施し、床吹出気流の分布による室内温熱環境への影響を確認した。また、CFD解析の簡略化について検討し、吹出条件に分布を平均化して、一律に設定する方法の有効性を確認した。

本研究では、建築・設備仕様が上下温度差に及ぼす影響を設計初期段階に把握するために、上下温度分布予測モデルを用いてオフィスの数値解析を行った。更に既往研究では「空調開始直前の床表面温度」と「空調時間帯の上下温度差」に密接な関係があるとされており、本研究ではこの関係を基に、早期に建築・設備仕様から上下温度差を評価し、対策の要否を検討する手法を提案した。

To use tuned mass damper (TMD) for structures with period fluctuation, the authors proposed a newly developed semi-actively controlled TMD. Its resonance frequency is controlled by changing the damping coefficient of the variable dampers. This paper reports on its shaking table tests. First, the configuration and control method of the proposed TMD are described. Second, the design concept and specification of the specimen are presented. Finally, the results of the shaking table tests are shown. They are compared with that of simulation analyses, and the accurate operation of the control system and expected behavior of the specimen are confirmed.

This study reports the relationship between the movement of medical equipment and near-fault and long-period-long-duration earthquake ground motions, aiming to provide practitioners and researchers with criteria for limiting disorder and functional deterioration during earthquakes. The influence of floor sheeting materials on the rolling friction coefficients of the equipment’s casters and their resistance to move out of floor dents was evaluated at a pulling test. Then, the seismic behavior of medical equipment was evaluated at E-Defense shaking table tests where a group of critical equipment was arranged for department rooms in the full-scale earthquake-resistant and seismically-isolated steel frames.