Sharif Digital Repository

In these days world, the increasing growth of Nanotechnology has caused to invent and create new numerical and also computational methods which have more abilities and capabilities for evaluating systems in this scale. Although Some techniques, such as Molecular Dynamics Methods are capable of evaluating nanostructures, lack the ability to simulate large systems of practical size and time scales which is the most important index during the simulation. Therefore, in order to be able to produce an acceptable exact simulation of a large model, simulation of which is limited by the computational cost of the current molecular dynamics methods at hand, Coarse-Graining technique has recently become... 

Base isolation system is an efficient passive structural control approach to save the structures from the harms of earthquakes. The base isolated systems help to reduce the base shear by increasing the period of the structures, as well as dissipating the seismic input energy by its inherent damping mechanism [1]. However, the residual displacement of the base isolation systems resulted from strong ground motions would remain as a main obstacle in its regular serviceability after the main event. In that regard different isolating devices have been introduced to resolve the problem of the remaining permanent displacement. On the other hand, Shape Memory Alloys (SMAs) are among the newly... 

Seismic performance analysis is conducted for an isolated three-span continuous highway bridge, which is restrained with shape memory alloy bar. Two series of earthquake ground acceleration, known as ‘pulse records’ and ‘non-pulse records’ are applied to the bridge in three directions. Four types of pier-girder connection are used in the analysis: rigid connection (only for comparison), lead rubber bearing system (LRB), lead rubber bearing along shape memory alloy (SMA) restrainer system and high damping rubber bearing (HDRB) system. SMA bar restrainer is made of Ni-Ti. In the first step of the work, structural properties and analytical models of the bridge segments are introduced. Then, a...