Showing 2 results for Dynamic Behavior
Volume 4, Issue 2 (5-2011)
Abstract
Huge amount of scarp tires have made a big environmental problem that its reduction assessment is an important aim for researchers. Reusing of these materials in different branch of industrial is concentrated. Because of elastic behavior and absorbing the energy, waste tires are concerned as a famous damper. As a more effective manner to check the seismic forces is reducing the entered movements to the structure, it seems that using soil-scrap tire mixtures acts as seismic damper and these mixtures can reduce the earthquake forces acting to the structure. In this research this mixture is modeled as a damper under the foundation and the bed rock depth is analyzed in both time and frequency domains. Obtained results show that using soil-tire mixture reduces the resonance amplitude, energy and the acceleration reached to the ground surface. It should be mentioned that increasing the depth of the bed rock, the act of the mixture as a damper reduces. The results show that this mixture has a better operation in strong ground motions. Using these materials is cheaper compared with other base isolation systems, more available, not requiring high technology and also it reduces both earthquake forces and environmental problems.
Ali Ghanbari, Mohsen Mojezi, Meysam Fadaee,
Volume 6, Issue 2 (4-2013)
Abstract
Construction of asphaltic core dams is a relatively novel method especially in Iran. Iran is located in a region with high seismicity risk. Therefore, many researchers have focused on the behavior of such types of dams under earthquake loading. In this research, the behavior of asphaltic core rockfill dams (ACRD) has been studied under earthquake loading using nonlinear dynamic analysis method and a new method is presented to assess seismic stability of these types of dams in earthquake conditions. Based on nonlinear dynamic analysis, the current study attempts to provide an appropriate criterion for predicting the behavior of earth and rockfill dams considering real behavior of materials together with actual records of earthquake loading. In this method, the maximum acceleration of the earthquake record (PGA) increases until instability conditions. Finally, a new criterion is presented for evaluating seismic safety of ACRDs via demonstrating curves of the crest's permanent settlement and maximum shear strain against maximum earthquake acceleration. Results of the proposed criteria can assist designers of asphaltic core dams to predict dam stability during earthquake event
