Yoshihiro Mataki

Aerodynamic damping effects of tall building for a vortex induced vibration

Abstract The influences which are induced upon the wind-induced response of the plane shape of a super high-rise building with an assumed height of 600m, as well as the dynamic effects of the vibration were studied. For this study, results obtained from the measurements of the wind force using a force balance, the response using a dynamic motion model, and the wind pressure of the face were used. From the result obtained from the response analysis made through the use of the measured result of the aerodynamic force and the result gained from the measurement of the response using the dynamic model, the change of the response, caused by a difference in the shape of a building and by the dynamic effect, have been clarified. Furthermore, as for the square shape which is a representative plane, the change of the pressure properties induced by the vibration of the building has been indicated.

Full-scale measurements of wind actions on Chiba Port Tower

Chiba Port Tower is 125 m high with a rhombus-shaped plan. On the top of the tower, a ‘Tuned Mass Damper’ (TMD, hereafter) was installed in order to reduce the vibration caused by strong winds and earthquakes. A lot of data during strong winds has been recorded since August 1987. From this data, it was found that the TMD works effectively when the response of the tower exceeds 0.5 cm/sec2 and that the TMD can reduce the wind-induced response of the tower by nearly 50 percent for all wind directions.

Internal pressure of double composite exteriors

Abstract An analytical approach for predicting the mean and fluctuating internal pressure induced by wind between double walls when the outer wall is provided with openings has been investigated. The method of analysis was based on jet simulated air-flow through the openings and a model of pressure flow between parallel planes. The analytical results were compared with wind tunnel results, and they matched closely.

Wind induced response of low-profile cable-reinforced air-supported structures

Abstract Presented is an analytical method to obtain the dynamic response on roof deflections and cable tensions of low-profile cable-reinforced air-supported structures under strong winds. This method is based on a quasi-static theory and results are obtained by using the data from wind tunnel tests and the theoretical dynamic characteristics of the structure. The analytical results are compared with the measured dynamic behavior of a large scale field model (25m × 25m) during a typhoon. It is shown that the calculated and the measured results are in good agreement.

Structural characteristics and wind resistant design of low-profile cable-reinforced air-supported structures

In general, air-supported structures are designed primarily against wind load which causes the greatest stresses in the environmental condition.Furthermore, the wind pressure distribution is variable and extremely complex in contrast to the load caused by internal pressure or dead load.This paper deals with following wind resistant characteristics of low-profile cablereinforced air-supported structure.1) The structural characteristics based on results of wind-load loading tests and periodically forced vibration tests by using a large-scale model.2) Wind pressure distribution of the roof measured in the field-test and the wind tunnel tests.3) The analytical determination methods of wind load and dynamic deformation of the roof.

A New Wind Tunnel of Technical Research Laboratory, Takenaka Komuten Co., LTD

We have installed a new wind tunnel of closed return type for carrying out our research in wind environment around tall buildings, aerodynamic stability of structures, atmospheric diffusion and design of a ventilation.The working section of this wind tunnel is 1.3m m height, 2.0min width and 16m in length. Wind velocity is able to vary from 1m/s to30m/s, and the uniformity of the velocity distribution is within±0.6%.The characteristics and performance of the wind tunnel are presented in this paper.