TY - JOUR
ID - 6005
TI - A New Relationship for Determining the Impact Force between Two Adjacent Structures Considering Building Pounding
JO - Journal of Rehabilitation in Civil Engineering
JA - JRCE
LA - en
SN - 2345-4415
AU - Ebrahimi, Yaghub
AU - Mortezaei, Alireza
AU - Hemmati, Ali
AU - Nikkhah Shahmirzadi, Mahmoud
AD - Ph.D. Candidate, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
AD - Associate Professor, Seismic Geotechnical and High Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
AD - Assistant Professor, Seismic Geotechnical and High Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
Y1 - 2022
PY - 2022
VL - 10
IS - 1
SP - 141
EP - 155
KW - Pounding
KW - Impact force
KW - Coefficient of restitution
KW - Spring stiffness
KW - Damping ratio
DO - 10.22075/jrce.2022.22918.1493
N2 - Insufficient separation distance between two adjacent buildings can cause to collision when large lateral displacements are accrued due to seismic excitation. The impact force between structures induces many serious damages, which is called building pounding. In this study, pounding between two dynamic models is investigated and the impact force is numerically calculated. The impact is simulated based on special elements, including spring and dashpot, and the impact force and dissipated energy during the impact are determined. Both mentioned parameters depend significantly on the impact velocity, spring stiffness and the value of damping. For this purpose, the impact velocity of collision is parametrically measured and subsequently, coefficient of restitution is automatically determined. Furthermore, the impact damping ratio and nonlinear stiffness of spring are calculated to evaluate the impact between models. 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. In the first stage, an experimental test is considered and the peak impact force is extracted when a concrete ball is dropped on a rigid concrete surface. 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.
UR - https://civiljournal.semnan.ac.ir/article_6005.html
L1 - https://civiljournal.semnan.ac.ir/article_6005_381b98c1da8e8f46f26e950976dd2257.pdf
ER -