Wind-induced coupled motion of tall buildings with varying square plan with height

Abstract

One characteristic of many tall buildings is that their building shapes vary with height, implying that the distribution of their structural components may also vary with height. Response analyses have been conducted for tall buildings with square plans with height variations using high-frequency force balance data, focusing on comparing the total accelerations of the various building shapes based on the shapes themselves, and not on different natural frequencies. The variation trends of total accelerations are different between mass and rigidity center eccentricity, and the acceleration of the square model is the largest, and the differences among models increase with eccentricity. For the setback and tapered models, although the across-wind acceleration is larger than that of the square model, the along-wind and torsional accelerations are smaller than those of the square model, resulting in smaller total rms acceleration response. However, the increase in torsional response for the tapered and setback buildings when the offsets lie in the windward diagonal direction may enhance building occupants' awareness of the motion even if the total rms accelerations become small.