@article { author = {Varazanashvili, O. and Tsereteli, N.}, title = {Seismic Situation's Probability Prediction in Greater Caucasus during the Period 2005-2025}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {1-11}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {This paper presents probabilistic prediction of seismic situation along the structural-tectonic zones of the axial part and the southern slope of Great Caucasus. It is an important problem, because large earthquakes (M>6) occur frequently in this area. As usual, the calculated probabilities of occurrence of large earthquakes give more condensed information. As it was expected, conditional probabilities of a future earthquake is small immediately after previous shock and it increases with the time passed after the last earthquake. To solve this problem, the spatial distribution and frequency of occurrence of large earthquakes is studied. In particular, it was found that epicenters of earthquakes with M>6 are distant from each other in this zone on the average distance of 100km. On the basis of maximum seismic activity in these areas, the average periods of recurrence of large earthquakes have been identified. By using a time-dependent model of seismicity, some segments and subsegments of the structural-tectonic zones and conditional probabilities of occurrence of large earthquakes for the period 2005-2025 were calculated. Studies have shown that areas with a high probability of occurrence of large earthquakes deserve priority in controlling the seismic situation.}, keywords = {Greater Caucasus,Seismic Situation,Structural-Tectonic Zone,Conditional Probability}, url = {http://www.jsee.ir/article_240602.html}, eprint = {http://www.jsee.ir/article_240602_ddea4cc1476f1bc10915dc6c171421d3.pdf} } @article { author = {Askari, F. and Dabiri, R. and Shafiee, A. and Jafari, M.K.}, title = {Effects of Non-Plastic Fines Content on Cyclic Resistance and Post Liquefaction of Sand-Silt Mixtures Based on Shear Wave Velocity}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {13-24}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {The cyclic resistance, shear wave velocity and post-liquefaction behavior of saturated Firoozkooh sand with different percentages of non-plastic silt are evaluated. Cyclic triaxial and resonant column tests performed on reconstituted samples prepared in laboratory utilizing undercompaction method. The data obtained from this study along with other existing data were transferred to the field and compared with the field performance curves based on shear wave velocity proposed by Andrus and Stokoe-2000. Then, to observe post-liquefaction behavior of the mixtures, volume change and pore pressure dissipation were measured. Tests results exhibit a clear trend among cyclic resistance, shear wave velocity and post-liquefaction behavior of specimens. In addition, the laboratory results indicated that using the existing field-based correlations may overestimate the cyclic resistance of the Firoozkooh sand-silt mixtures when silt content is 60%. For clean sand and the specimens with up to 30% fines, results of this study are fairly consistent with Andrus and Stokoe correlations. Increasing fines content would increase the final post-liquefaction volumetric strain.}, keywords = {Non-Plastic Fines,Cyclic Resistance,Shear wave velocity,Field Performance Data,Cyclic Triaxial Test}, url = {http://www.jsee.ir/article_240603.html}, eprint = {http://www.jsee.ir/article_240603_0ef1da9c4bf0c45834a0ad8f0653c25d.pdf} } @article { author = {Sarafraz, M. and Danesh, N.}, title = {Experimental Study on Flexural Strengthening of RC Columns with Near Surface Mounted FRP Bars}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {39-50}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {The effectiveness of FRP jackets for increasing the compression strength, shear strength and ductility of reinforced concrete (RC) columns was demonstrated in many studies, but the influence of FRP jacketing on the flexural capacity of columns is minimal. In this paper, a new retrofit method, which utilized near surface mounted (NSM) fiber reinforced polymer (FRP), was studied aiming to improve the flexural capacity of RC columns subjected to bending and compression. This technique is based on bonding fiber reinforced polymer (FRP) bars into grooves cut in the cover of RC columns. For this purpose, five reinforced concrete column specimens were designed, constructed and subjected to constant axial compression and lateral cyclic loading. In addition, the strengthened columns were wrapped with carbon composites to satisfy seismic detailing requirements. The test results show that by using the NSM technique, the flexural strength and lateral load capacity of the columns increase significantly. The test results were also compared with the results obtained from the analytical study that was conducted based on strain compatibility. A good agreement between analytical and experimental results was observed.}, keywords = {Flexural Strengthening,Reinforced Concrete Column,NSM Rod,FRP,Composite}, url = {http://www.jsee.ir/article_240605.html}, eprint = {http://www.jsee.ir/article_240605_f8c9db701eba7bd8bc16cb631d9e9fb8.pdf} } @article { author = {Izadkhah, Y.O. and Amini Hosseini, K.}, title = {An Evaluation of Disaster Preparedness in Four Major Earthquakes in Iran}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {61-75}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {Iran is located in the Alpine-Himalayan seismic belt, as one of the most active tectonic regions of the world. Throughout history, the country has frequently suffered large and destructive earthquakes and experienced several major earthquakes in the past few decades. More than 70 percent of the big cities in Iran are located in the vicinity of seismic faults and in some cases, the active faults pass through the city. Therefore, earthquake preparedness can be regarded as one of the factors which can contribute to safety of various groups of citizens. In Iran, measures have been undertaken to improve the public knowledge about disasters. A review on the activities of recent two decades, reveal the gradual improvement on the trends of earthquake preparedness in the country. The aim of this paper is to evaluate the progress of disaster preparedness in four major earthquakes that has occurred in Iran including Manjil - Roudbar, 1990, Changureh-Avaj 2002, Bam 2003, and Darb-e-Astaneh-Silakhore 2006 earthquakes. At the end, recommended strategies towards promoting public awareness and education as well as professional training are presented.}, keywords = {Earthquake Preparedness,Manjil-Roudbar,Changureh-Avaj,Bam,Darb-e-Astaneh Earthquakes,Iran}, url = {http://www.jsee.ir/article_240607.html}, eprint = {http://www.jsee.ir/article_240607_040223b1d52541f46aaae03ca42dce8a.pdf} } @article { author = {Vasseghi, A. and Tajoddini, A.}, title = {Stability of Plate Girders in RBS Connections: A Numerical Approach}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {77-82}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {Steel moment frame connection with Reduced Beam Section (RBS) is one of several pre-qualified connections which have been proposed in FEMA 350 for use in moment resisting frame structures. Previous studies on behavior of RBS connections are limited to connections with rolled sections and design requirements have been developed for such sections. Large size rolled sections are not readily available in developing countries like Iran and steel frame structures are usually built using plate girders. In such structures the slenderness ratios of web and flanges could greatly influence the seismic performance of the RBS connection. In this paper the effect of slenderness ratios of web and flanges on the behavior of RBS connections is studied by nonlinear finite element analyses. The analyses simulate inelastic local buckling of the girder as ductility and energy dissipating capacity of the connection are directly influenced by such inelastic behavior. Twelve RBS connections with various web and flange slenderness ratios are analyzed to evaluate the effect of slenderness ratios on ductility of the connection. The results indicate that FEMA- 350 requirements for maximum slenderness ratios of web and compression flange are too conservative. Connections in which the slenderness ratios of girder web and flanges exceeded the allowable limits by up to 30 percent have shown proper ductile behavior in the analyses.}, keywords = {RBS Connection,Seismic,Compactness,Buckling}, url = {http://www.jsee.ir/article_240608.html}, eprint = {http://www.jsee.ir/article_240608_9c3bd2ee72328877ef4bd61da3e7741a.pdf} } @article { author = {Omidvar, B. and Rahimian, M. and Mohammadnejad, T. and Sanaeiha, A.R.}, title = {3D Topography Effects on Amplification of Plane Harmonic Body and Surface Waves}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {25-38}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {In this paper, three-dimensional scattering of plane harmonic SH, SV, P, and Rayleigh waves by surface topographies is investigated by using a boundary element method in frequency domain. It is shown that for exact evaluation of surface ground motions in topographies all efficient parameters such as geometry of the region, mechanical properties of the surrounding geological materials (density, Poisson's ratio, and shear modulus), wave type, azimuth and angle of incidence, as well as stimulation frequency must be taken into account altogether. Furthermore, the results emphasize the need for three-dimensional modeling of irregularities. Most of the topographies in the nature are composed from the simple shape. Based on this fact, four problems are considered in order to study the effects of the shape of the topography on the surface ground motion amplification. In order to assess the accuracy and efficiency of the proposed formulations for the computation of the surface displacement field amplification, several problems are considered. The investigated problems are hemispherical canyons, elliptical-shaped canyons, hemispherical hills and rectangular cube canyons.}, keywords = {Boundary element method,Body and Surface Wave,wave propagation,Topographic Effect,Frequency Domain}, url = {http://www.jsee.ir/article_240604.html}, eprint = {http://www.jsee.ir/article_240604_21189cf0cdc90ddbe35b74e4dbc65944.pdf} } @article { author = {Shakib, H. and Mirjalili, A.R.}, title = {Experimental Investigation of the Effect of Transverse Beams on the In-plane Behavior of Brick-Flat-Arch Roofs}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {12}, number = {Issue 1 and 2}, pages = {51-59}, year = {2010}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {}, abstract = {A number of historical and residential buildings were constructed with traditional brick-flat-arch roofs. The seismic behavior of this type of diaphragms has shown that they have a poor seismic performance. Several methods were suggested to retrofit this type of diaphragms. In this research, the in-plane seismic behavior of retrofitted brick flat arch diaphragms using transverse beams is investigated with experimental models. For this purpose, four full-scale experiments of roof diaphragm were conducted under cyclic loading. The results of the two first experiments showed that non-retrofitted traditional flat arch roofs have insufficient stiffness, shear capacity and integrity. In the retrofitted models however, the transverse beams within all the spans of roof can improve the in-plane behavior of this type of diaphragm to the extent that acceptable improvement in integrity and ductility of the diaphragm was observed in retrofitted roof, but the transverse beams could not properly improve the other seismic parameters of the diaphragm such as its shear capacity and stiffness. Therefore, this retrofitting method might not be an adequate method to secure the appropriate in-plane behavior of flat-arch roofs.}, keywords = {Brick Flat Arch,Diaphragm,Masonry Building,Seismic Performance,Retrofitting, Transverse Beams}, url = {http://www.jsee.ir/article_240606.html}, eprint = {http://www.jsee.ir/article_240606_6d31c4c634e8d1d401eb03ce93717b49.pdf} }