Sharif University of Technology Scientia Iranica 1026-3098 22 1 2015 02 01 A NEW MODEL FOR CALCULATING THE IMPACT FORCE AND THE ENERGY DISSIPATION BASED ON CR-FACTOR AND IMPACT VELOCITY A NEW MODEL FOR CALCULATING THE IMPACT FORCE AND THE ENERGY DISSIPATION BASED ON CR-FACTOR AND IMPACT VELOCITY 59 68 1843 EN Hosein Naderpour Faculty of Civil Engineering, Semnan University, Iran Rui Manuel De Menezes E Carneiro De Barros Faculty of Engineering, University of Porto, Portugal Seyed Mohammad Khatami Faculty of Civil Engineering, Semnan University, Iran Journal Article 2014 09 28 Many researchers have studied building pounding to calculate the dissipated energy and the impact force between two buildings during earthquake. In this paper, a new equation is proposed to measure the impact force and energy dissipation. The results based on the proposed equation are compared with results of the available equations. Using a suggested link element, a new formula is presented to calculate the impact force and energy dissipation. In order to evaluate the results of dissipated energy, a new relation between CR and impact velocity is also suggested. Since there is a need to have a reference curve to select impact velocity based on coefficient of restitution, several impact velocities and CRs were evaluated. By using the latter curve, results could be evaluated. A new equation of motion is assumed to select the best impact velocity and coefficient of restitution. Finally, based on coefficient of restitution and by using a steady-state response of single degree of freedom system due to the external force, a new equation of motion is suggested to calculate impact damping ratio.  https://scientiairanica.sharif.edu/article_1843_991d8a30997fda427359e675940a4c7c.pdf