As buildings have become higher, it is likely to find the wind loads that is equal to or even greater than the design seismic loads. Therefore, it is important to estimate responses of high-rise buildings under fluctuating wind force. This paper presents contribution rate of higher mode wind response of multi-mass system for high-rise buildings by using a modal analysis in elasto range. Then, it shows that the wind responses are usually separated into the low and high frequency components, and the wind responses can be expressed as sum of them. The agreement between the predicted value based on coupling of two components and results of time-history analysis was finally confirmed.

No abstract

Assessment of the mechanical fire safety performance of Japanese traditional floor-beam assemblies is conducted by predicting the post-fire bending stress of timber beams and validated by full scale 45 minutes furnace tests with specimens of floor-beam assembly of different spans and intervals of the beams. The study intends to explore the possibility to widen the application of and to develop theoretical method for the design of traditional wooden construction. It has resulted in the prediction of the fire safety performance of floor-beam assemblies by this method closer to reality than those by the conventional deformation-based assessment.

No abstract

Base-isolation system is designed to lengthen the period of the building. However, this can also increase wind-induced responses of the structure since wind forces have long duration and predominant energy on long periods. Furthermore, the mean component in the along-wind direction also causes certain base-isolation components, such as sliding bearings to become prone to creep phenomenon. Despite of this, evaluation methods of wind-induced response considering creep property on highrise base-isolated buildings with sliding bearings has not yet been fully investigated. Therefore, this paper examines the evaluation method on those buildings and clarifies the effect of creep property using timehistory analysis.