Abstract
The report describes about the effects of slope on vibrational characteristics of a roof by wooden panels construction. The full scale roofs were flat size of a 10.92m-long by 3.64m-wide and four types slopes of flat, 18-degree, 27-degree, and 45-degree. The forcing shaking test by an exciter, and free vibration test by an impulse hammer were carried out on these roofs. The dynamic shaking test showed that mode shapes were similar regardless of rise and fall of roof's slope and that natural frequencies became smaller along with roof's slope rising. Within lower degree, the observed values agreed with the frequencies based on the shearing vibration theory, but within higher mode degree, these were lower. The frequencies from eigenvalue analysis based on the shearing vibration type were a little lower than the observed values. The mode shapes were similar to sine-curves of vibration mode of the simple beam. In time history response analysis, response displacements were bigger along with roof's sloped rising, because of fall of horizontal stiffness. The effect of slope's degree was susceptible to weight.
