Abstract
Pounding phenomenon between base-isolated structures under near-fault earthquakes has been widely investigated with various impact models around the world. Firstly, the existing impact analysis models are summarized and discussed in this paper. For the Hertz-damp impact model, the damping constant does not coincide with its physical fact. Then, the damping constant in the Hertz-damp impact analysis model was modified based on the Hertz theory. Next, the approximate formula of the damping constant is theoretically derived, and the effectiveness is verified by a simulation analysis. The numerical results show that the pounding can significantly increase the floor acceleration, especially at the isolation layer. In addition, the impact stiffness has a significant effect on the acceleration response, and the inter-story drifts are also sensitive to the variety of impact stiffness. The simulation results indicate that excessive flexibility at the base-isolated system may lead to a susceptible pounding with a limited seismic gap.
Highlights
Structural pounding is a complicated nonlinear problem
The Kelvin model is often used to simulate the collision with the adjacent structure, but the demerit of the Kelvin model is that the damping coefficient in the expression is constant
The results show that the isolation effectiveness is greatly affected by the pounding of the base-isolated structure and adjacent structures
Summary
Structural pounding is a complicated nonlinear problem. In order to effectively investigate the impact response of adjacent structures, it is essential to establish a reasonable impact analysis model. MODIFIED HERTZ-DAMP MODEL FOR BASE-ISOLATED STRUCTURAL POUNDING SIMULATION UNDER NEAR-FAULT EARTHQUAKES. Matsagar et al [7] investigated impact models of different types for seismic isolation structures with adjacent structures under earthquakes. Utilizing the nonlinear Hertz-damp model of the contact element method, Zhao et al [10] investigated the dynamic equations of the pounding between a base-isolated structure and non-isolated structure. Zou et al [12] analyzes the impact problem of the adjacent base-isolated structure with prestressed rubber bearing, and the results show that the horizontal displacement of the base-isolated structure can be effectively reduced by ordinary rubber bearing. A series of parameters for an analysis, including the isolation period, initial gap size and type of earthquake, yielding displacement, number of story, and impact stiffness, are implemented to investigate the effectiveness of the base-isolated structure under near-fault earthquakes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
