The aims of this work is to present the results of monitoring and measurement of the vibration levels in some residential and industrial buildings. The first part deals with vibrations on slabs belonging to industrial buildings and produced by textile machines. Many textile factory structures are composed of a very large area, but with one or two stories supporting light machines. In order to avoid dynamic analysis, the load designs are higher than the actual loads. As a result, the dynamic characteristics are not take into account and many of these slabs present very large amplitude of displacements. The analysis of measured accelerations in two factories showed this type of problem and theoretical analysis showed that natural frequencies of the slabs were very close to the working frequencies of the machines. In the first, no cracking were observed, but the workers complained about discomfort and fright. In the second, the failure number of the machines was higher than expected. According to the machine manufacturer, the allowable velocity for the slabs would be 10 mm/s, but integration of the measured accelerations revealed that the peaks of the velocity were as high as 20 mm/s. The second part deals with vibrations on residential buildings. Construction works, traffic and dance halls usually produce unpleasant motions to the buildings on the neighborhood and inhabitants of urban area are disturbed by vibrations. The monitoring of two buildings close to a gymnasium used for social events shows that the accelerations produce by a crowd moving rhythmically on a dance hall were higher then allowable values and attempts to eliminate the wave propagation were unsuccessful. On the other hand, the experimental data from vibrations on a 16-story residential building produced by pile driving revealed that the level of the velocity was not enough to produce damage to the building.
