BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING
Year:2016 | Volume:2 | Issue:4 |Papers Count:6

In recent years, many models for earthquake recurrence were proposed. The methodology adopted in this study is based on the fusion of the statistical renewal model called Brownian passage time (BPT) with a physical model. The later taking into account the instantaneous change of the static Coulomb stress (DCFF) for the computation of both the permanent and the transient effects of earthquakes occurring on the surrounding sources. Renewal models are frequently used to estimate the long-term time-dependent probability of the next large earthquake on specific faults or fault segments where large shocks occur repeatedly at approximately regular intervals. In this approach, it is assumed that the times between consecutive large earthquakes (inter-event times or recurrence intervals) follow a certain statistical distribution...

With growing of civilization and population in urban areas, the seismic vulnerability of man-made structures is also growing. This is more significant in regions with high seismic hazards. Iran Plateau is located at the second most seismic belts of the earth, and many cities and urban area are located in high seismicity regions. On the other side, an accurate seismic analysis and design of structures requires realistic and representative strong motion records of the building area. However, such a strong motion record is not available for any region, or there are not sufficient numbers to accurately represent random and stochastic nature of the earthquakes. Putting all these together, the need for generating synthetic strong motion records or accelerograms that are coherent with the source and site characteristics of any area is highlighted...

Earthquake-induced cyclic shear stresses may lead to a remarkable loss of shear strength, accumulation of pore water pressure, and permanent large amplitude deformations in granular soils. The technical term liquefaction is commonly attributed to the family of phenomena named above. Liquefaction of clean sands has been studied extensively in the laboratory, and in past, it used to be believed that the presence of non-plastic fines in coarse granular soils definitely eventuates in strengthening the soil structure against liquefaction...

The landslides occurred due to an earthquake have ever caused great losses of life and property. Earth slope stability is influenced by many factors that should be taken into account for a comprehensive assessment of it. However, slope seismic analyses are complicated due to the necessity of concerning the dynamic stresses caused by an earthquake and the soil resistance changes in seismic conditions. Seismic slope instability can arise from two significant factors including the increase of inertia forces and the decrease of soil shear strength. Moreover, the earthquake motions can produce considerable dynamic shear and vertical stresses in earth slopes. If these stresses are added to the static stresses existing in the soil mass, they may lead to slope instability...

Pile driving is one of the pile construction methods to install prefabricated concrete piles using special tools. Driving method and its process is one of the most important aspects of implementation of this pile, so that the lack of sufficient accuracy to this problem, in addition to reducing operation efficiency, affects the surrounding environment and soil. In this paper, the behavior of cylindrical and tapered hollow piles were investigated with real tests and numerical analyses using FLAC3D software. The efficacy of pile geometry such as cylindrical and tapered hollow piles is analyzed in pile driving under hammer impact...

Liquefaction phenomena may cause two major concerns: 1- Ground deformation or ground failure due to the excess pore water pressure, and 2- Changing in ground site response caused by softening of liquefiable soil. Liquefaction assessment and its consequences have been investigated by many researchers. Although, there are not enough studies to determine the effect of soil softening and liquefaction on the seismic ground response. The main purpose of this study is to evaluate the ground response for liquefiable sites. Hence, Specific Cumulative Strain Energy (SCSE) parameter is defined to consider the effects of earthquake duration and thickness of liquefiable layer. The results of amplification pattern were presented in both of the effective and total stress analyses...