Document Type : Regular Paper
Civil Engineering Department,Semnan Branch, Islamic Azad University, Semnan, Iran.
Seismic Geotechnical and High Performance Concrete Research Centre, Civil Engineering Department,Semnan Branch, Islamic Azad University, Semnan, Iran.
Semnan Islamic Azad University
Seismic Geotechnical and High Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
Abstract. Insufficient separation distance between two adjacent buildings can cause to collision when large lateral displacements are accrued due to seismic excitation. In this study, pounding between two dynamic models is investigated and the impact force is numerically calculated. Both mentioned parameters depend significantly on the impact velocity, spring stiffness and the value of damping. Finally, a new equation is presented to determine the value of damping and the accuracy of formula is confirmed, which is verified by three various approaches. On the other hand, a numerical simulation is similarly assumed and the suggested formula is used to determine the peak impact force during collision. Then, the results of the peak impact forces between experimentally and numerically analyses are compared, which shows both are close to each other. Secondly, an estimated impact between two bodies has been studied. The results of the analysis are also compared between the dissipated and kinetic energies during impact. The comparisons indicate relatively low errors between the calculated and assumed values of the coefficient of restitution when the proposed equation is used. Finally, a value of the coefficient of restitution is selected and an impact is simulated to show hysteresis loop. The enclosed area of each loop is calculated as the dissipated energy and compared with the energy absorption. The above three comparisons show that the proposed formula is very effective and the accuracy of the impact force, calculated by the suggested formula as a parameter of the impact force model, is also acceptable.