環境工学における市街地風の変動とその影響に関する研究-6 : 市街地における建築物壁面風圧の性状について

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Wind pressure records, taken from two pressure transducers located at various levels of 30-40m tall buildings in Tokyo, are analyzed to determine mean pressure coefficients, spectiral function, cross-correlation functions and frequency response functions. Two differential pressure transducers, made of thin metal bellows with four-arm unbonded strain-gauge bridges, are used to measure the pressure differences between each of tapping points and the atmospheric pressure detector. The atmospheric pressure detector consists of pitot-static tube, nozzle and blowers. Jet. speed from the nozzle is about 60m/s and the atmospheric pressure can be detected when natural wind speed above the roof is less than 10m/s. Observational resuts are obtained as follows, i) The coefficient of variation of fluctuating wind pressure is proportional to the turbulent intensity of wind, and windward one is larger than leeward one. ii) Power spectral density of wall pressure is larger than that of natural wind above the roof in high frequency range. iii) Cross-correlation coefficient between windward pressure and natural wind speed is large at small time lag, and so is its coherency at low frequency band. Relating to leeward pressure, cross-correlation coefficient and coherency are small at small time lag and all frequency band respectively. iv) The values of amplitude gain and out of phase between windward pressure and square of natural wind speed are about 0.03 and zero respectively.
社団法人日本建築学会の論文
1972-01-30

環境工学における市街地風の変動とその影響に関する研究-6 : 市街地における建築物壁面風圧の性状について

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