BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Volumul 63 (67), Numărul 3, 2017 Secţia CONSTRUCŢII. ARHITECTURĂ THE HARMFUL EFFECTS OF VIBRATIONS ON HUMAN BY IRINA ŞTEFAN (OANCEA) * , MIHAI BUDESCU and MIHAELA MOVILĂ “Gheorghe Asachi” Technical University of Iaşi Faculty of Civil Engineering and Building Services Received: July 28, 2017 Accepted for publication: September 1, 2017 Abstract. This paper presents the harmful effect of vibrations on the human body. The vibration effect is quantified using the perception coefficient, K. In order to determine the perception coefficient, measurements were made in an area near the railways. Based on the measurements, the intensity of vibration and the degree of human vibration perception were determined. The results show that the vibrations generated by the railway transport and transmitted to the adjacent areas are highly perceptible, thus imposing vibration mitigation measures. Keywords: coefficient of perception; intensity of vibration. 1. Introduction Vibrations are dynamic phenomena commonly encountered in people's lives, with positive implications (heart beats, winding trees, vibrations produced by musical instruments), but also negative (tremors of buildings in earthquakes or those produced by means of transport). Vibrations are analyzed for the purpose of highlighting and characterizing vibration sources, determining the vibration levels experienced both inside and outside buildings, their impact on human comfort, and highlighting control, protection and mitigation measures. * Corresponding author: e-mail: irina.oancea@tuiasi.ro