@article { author = {Jalilian, Zahra and Mahood, Majid and Heidari, Reza and Mehramuz, Mahmoud}, title = {Evaluation of Earthquake Hazard Parameters by Bayesian Method for Different Source Regions in Zagros Seismotectonic Province}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {1-16}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.245196}, abstract = {In this study, we used the program for seismic hazard Bayesian estimate elaborated by Alexey Lyubushin. However, earthquake hazard parameters of maximum magnitude (Mmax), β value, and seismic activity rate or intensity (λ) and their uncertainties for the 30 different source regions in Zagros seismotectonic province have been evaluated with the help of a complete and homogeneous earthquake catalog during the period 1900-2019 with Mw ≥ 4.0. The estimated Mmax values vary between 5.05 and 7.41. The lowest value is observed in the MZ3 source whereas the highest value is observed in the MZ2 source. Also, it is observed that there is a strong relationship between the estimated maximum earthquake magnitudes estimated by the Bayesian method and maximum observed magnitudes. Moreover, quantiles of functions of distributions of true and apparent magnitude for future time intervals of 10, 20, 50, 100, 475 years are calculated with confidence limits for probability levels of 50, 60, 70, 80, 90, 95, and 98% in 30 different source regions. MZ2 source shows earthquake magnitude greater than 7.0 in next 100-years with 90% probability level as compared to other regions, which declares that these regions are more susceptible to the occurrence of a large earthquake. The outcomes obtained in the study may have useful implications in probabilistic seismic hazard studies of Zagros seismotectonic province.}, keywords = {Earthquake hazard parameter,Bayesian method,Maximum magnitude (Mmax),Zagros seismotectonic province}, url = {http://www.jsee.ir/article_245196.html}, eprint = {http://www.jsee.ir/article_245196_807aff58f37156bd1868f9d4a5d41e2e.pdf} } @article { author = {Khajavi, Reza and Abouk, Farahnaz and Arastoopoor, Sholeh}, title = {Identification and Evaluation of Main Research Themes for Earthquake Studies in Material and Energy Fields by Science Maps and Scientometric Methods}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {17-35}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.246978}, abstract = {Finding new research themes in any branch of science is vital for researchers, universities, research institutes, research sponsors, administrators and research policymakers. Powerful tools for this purpose are the well-defined science maps and keyword networks, as well as appropriate scientometric indices and diagrams. Interpreting such maps and diagrams will present an overall outlook of the research area, and the most important or challenging research topics of the field are revealed. Earthquake studies in two economically important fields of energy and material are visualized to identify new research topics with high commercial potentials. After research documents are retrieved from SCOPUS for 2010-2020, meta-dataset is used to present science maps and scientometric diagrams by use of VOSViewer and Biblometrix. They are then analyzed and interpreted qualitatively and quantitatively for three main tasks: Identification of the main research topics; Evaluation of the topics for research and commercial capacity; Determination of main research themes. The results of both qualitative and quantitative methods are well close to each other. Based on the results, four main research themes are characterized as up-to-date recent trends in Earthquake studies for both fields: nonlinear analyses, experimental modellings, different types of seismic assessment, and resilience. The results of the method are fruitful for research planning of associative earthquake institutes and researchers.}, keywords = {energy,Earthquake,Keyword network,material,Science map}, url = {http://www.jsee.ir/article_246978.html}, eprint = {http://www.jsee.ir/article_246978_06b76ae376c6ac50f3194f583a876caa.pdf} } @article { author = {Cheraghzade, Milad and Ghafory-Ashtiany, Mohsen and Bahar, Omid}, title = {TCMS: A Software for Vibration-Based Condition Monitoring of Post-Tensioned External Tendons}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {37-57}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.244831}, abstract = {This paper presents a developing open-source software, named TCMS (Tendon Condition Monitoring Software), for condition monitoring of post-tensioned external tendons. This software allows users to run a complete process with three main goals: pre-processing of the input data, system identification for modal analysis, and tensile force estimation. A new Graphical User Interface (GUI) designing tool, App-Designer, is used to create a friendly GUI on the MATLAB software environment of MathWorks. A new approach for Finite Element (FE) modeling of an experimental tendon in which the load-bearing component is separately developed from the mass and stiffness components is also presented. The FE tendon model's modal parameters are identified from modal analysis to validate the applicability of TCMS. Then, the identified mode shape ratios and frequencies are used for vibration-based tensile force estimation. A comparative study based on provided tools and FE models in TCMS is conducted on different methods for tensile force estimation. The obtained results show that the existing tensile force using different methods can be estimated with accuracy in an average range of 1 to 10%. The current version of TCMS is mainly focusing on the establishment of examined modules for tensile force estimation. The TCMS source-code and data are available online on: https://github.com/miladcheraghzade/TCMSSoftware.git.}, keywords = {MATLAB,App-Designer,Condition monitoring,Tendon,Tensile force estimation,Vibrational measurement}, url = {http://www.jsee.ir/article_244831.html}, eprint = {http://www.jsee.ir/article_244831_4bf5600878dd8c13605a48cf408406e1.pdf} } @article { author = {Zare Dastjerdian, Mehrdad and Mohammadi, Majid}, title = {Experimental Evaluation of Cyclic Behavior of Concrete Filled Steel Battened Columns}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {59-74}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.245463}, abstract = {Steel battened columns have been widely used in semi-rigid frames in last decades in some countries including Iran. In past earthquakes, severe failure under lateral actions was observed in residential and industrial buildings with such structural system. Many retrofitting or repairing methods have been proposed including adding some steel plates to the columns in order to change their section to a box. These methods are not only expensive and hard but also did not strengthen the columns at the connection with beams. Therefore, this paper has focused on a new innovative method; filling the battened columns with concrete, which has been previously applied for steel tubes. In this experimental and analytical program on seven specimens, axial load level and batten spacing intervals were considered as the key variables. The obtained results showed that the concrete filled battened columns can provide a stable cyclic response with enhanced lateral strength, higher dissipated energy and ductility, in comparison with the hollow one; the average improvement in the lateral strength and energy dissipation were recorded as about 30% and 300%, respectively, in comparison with the hollow ones. Furthermore, it is shown that capacity modification factor of a concrete-filled specimen is up to 47% higher than that of the similar hollow one. Regarding that filling with concrete raises both the ductility and strength. This method is highly recommended to strengthen fragile hollow battened columns.}, keywords = {Battened columns,Concrete Core,Ductility,Dissipated energy}, url = {http://www.jsee.ir/article_245463.html}, eprint = {http://www.jsee.ir/article_245463_7043ff594a9649d51cfe28826c580186.pdf} } @article { author = {Bahaari Zargar, Vahid and Gerami, Mohsen and Bahirai, Mohammad}, title = {Comparison of Seismic Performance Improvement Techniques of End Plate Connections through Intentionally Weakening of Beam}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {75-88}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.244167}, abstract = {In some cases, such as provisions changes in new code or even changes in the structure performance of the building, it may be probable that the component thickness of end plate steel frame connections does not qualify related regulations. In these conditions, there is a need to improve the performance of the connection for preventing the plastic hinge from occurring at the steel column face. For this purpose, two general techniques are accessible that include intentionally weakening the beam through “reduction” and “annealing”. The latter process is a heat induction technique meant to reduce the yield and tensile strength of steel. The current research is about to compare these two techniques and address the parameters influencing the performance of “the enhanced connection”. For each technique, four specimens having end plates with different thicknesses are considered. It is concluded that the heat induction technique was preferable in terms of energy dissipation, moment capacity, local buckling of beam and torsional stability. It should be noted that both techniques were successful in shifting the plastic hinge action away from the column face for the endplate connections with a maximum decrease of 15 mm in the endplate thickness. Moreover, eight numerical models were investigated to compare the “heat induction” and the “reduction” techniques sensitivity to temperature of the weakened and width of the trimmed region respectively.}, keywords = {Seismic performance enhancement,Extended endplate connections,Heat-treatment method}, url = {http://www.jsee.ir/article_244167.html}, eprint = {http://www.jsee.ir/article_244167_a3fcb1d7cad71852a1e9e3b3908bdc8d.pdf} } @article { author = {Alimohammadi, Dariush and Izadi Zaman Abadi, Esmaeel}, title = {Probabilistic Performance Appraisal of Seismic Structural Design Methodologies: A Case Study for RC/MRF Systems}, journal = {Journal of Seismology and Earthquake Engineering}, volume = {22}, number = {2}, pages = {89-100}, year = {2020}, publisher = {International Institute of Earthquake Engineering and Seismology}, issn = {1735-1669}, eissn = {2821-2541}, doi = {10.48303/jsee.2020.246980}, abstract = {In this study, the effect of using two seismic design methodologies, Direct Displacement-Based Design (DDBD) and traditional Force-Based Design (FBD), on the probabilistic seismic performance of an 8-story RC moment resistant building is investigated. Also, two probabilistic procedures are applied for considering aleatory and epistemic uncertainties. Thus, this research is conducted by studying (i) non-linear static curve (ii) incremental dynamic analysis curve (iii) the Mean Annual Frequency (MAF) (iv) seismic demand of limit states (v) the confidence level of structures under the earthquakes with low to high hazard levels. Based on the comparing two mentioned seismic design methods, it can be said that the structure designed with FBD, unlike DDBD methodology is not capable of estimating performance goals. Also, it is concluded that the structure under both aleatory and epistemic uncertainties behaves more vulnerable and MAF of exceeding the immediate occupancy and collapse prevention is increased.}, keywords = {Direct Displacement Based Design,RC frame,Nonlinear Analysis,Probabilistic evaluation,Confidence level}, url = {http://www.jsee.ir/article_246980.html}, eprint = {http://www.jsee.ir/article_246980_9f30f853aa075977274c26b27473a9b6.pdf} }