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Reza Abbasnia Alireza Tajik Davoudi Mohammad M. Maddah 《Journal of Earthquake Engineering》2014,18(7):987-1008
The main purpose of this article is to develop an alternative adaptive pushover method in which multiple inelastic response spectra proportional to the instantaneous ductility ratio of the structure are employed to reflect the actual energy dissipation characteristic of the structure at a given deformation level. Based on the proposed methodology, two load patterns are independently applied to the structure and the envelope of the demand values is computed. The obtained results demonstrate that the proposed method provides improved predictions of the peak interstory and total drift profiles of the structure. 相似文献
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Multi‐Domain User‐Generated Content Based Model to Enrich Road Network Data for Multi‐Criteria Route Planning 下载免费PDF全文
By utilizing today's web‐based technologies, people can act as sensors and share their perceptions, emotions and observations in a variety of data forms, such as images, videos, texts, Global Positioning System (GPS) trajectories and maps. These forms are collectively called user‐generated content (UGC). These data are in different domains and have a multi‐modality nature. Although recent efforts have probed the acquisition of local knowledge by using single‐domain UGC data in specific applications, such efforts have not thus far presented a model considering multi‐domain UGC specifically to enrich road network data. This article aims at presenting such a model wherein, with the help of each data domain of UGC, one aspect of people knowledge about the road segment is obtained. These different aspects of knowledge are integrated using a Skyline operator to support multi‐criteria route finding. We name this model ERSBU (enriching road segments based on UGC). In ERSBU, road segments are basic spatial units, and their subjective properties have been extracted by using available UGC. The scenic score for each road segment was computed by using geo‐tagged Panoramio photos. The accessibility level of each road segment to different facilities was calculated based on data captured from Wikimapia and OpenStreetMap. Moreover, for measuring the movement popularity of each road segment, Wikiloc and Everytrail GPS trajectories were utilized. For the implementation of the ERSBU model, Tehran region 6 was considered the case study area. The Evaluation of the results proved that road segments that achieved a high score based on knowledge extracted from UGC also mostly gained top scores by analyzing traditional maps. ERSBU allows users to accomplish more‐qualitative path finding by considering the multi‐view characteristics of road segments. 相似文献
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Seyedebrahim Hashemi Rafsanjani Ali Bakhshi Mohammad Ali Ghannad Mohammad Yekrangnia Farzad Soumi 《International Journal of Architectural Heritage》2015,9(8):986-1004
In the present study, numerical simulations are conducted to estimate the in-plane response of adobe walls subjected to pseudo-static cyclic loading based on the finite element code ABAQUS. The simplified micro-modeling approach is adopted and an interface model reported in ABAQUS material library is applied as material model for zero-thickness interface elements. The comparison between obtained results and field test data results in good agreement. Parametric studies are carried out to evaluate the effectiveness of independent parameters changes on response of adobe walls. It is noted that mechanical properties of joints and adobe units play an active role on in-plane behavior of walls. A tri-linear benchmark curve is proposed to predict the response of aforementioned walls. In this regard, a statistical study is performed to derive the predictive tri-linear benchmark curve. The regressive analysis on 59 numerical models resulted in proposing predictive models. Finally, by comparing tri-linear curves obtained from the regressive analysis, numerical analysis, and experimental study, appropriate accuracy of theoretical model can be found. 相似文献
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Mohammad Sadegh Shahidzadeh 《Journal of Earthquake Engineering》2013,17(2):290-324
This article presents new ground-motion prediction equations for three distinct seismic regions of Iran via updating the previous global model using observed data for each region by means of Bayesian updating. The Bayesian theory has the advantage that it results in more accurate results even in situations when little data is available. This leads the way for updating global models to obtain new local models for seismotectonic regions with little available data like Iran. The proposed updated model was compared against currently available models for Iran and the results reveal the overall stability and quality performance of the proposed model. 相似文献
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Michael M. J. Fischer G. M. Wickens Mohammad Estelami Ludwig W. Adamec James A. Bill 《Iranian studies》1976,9(4):288-309
Traditionelle und moderne Formen der Landwirtschaft in Iran: Siedlung, Wirtschaft und Agrarsozialstruktur in nördlichen Khuzistan seit dem Ende des 19. Jahrhunderts. [Traditional and Modern Forms of Agriculture in Iran: Settlement, Economics, and Agrarian Social Structure in Northern Khuzistan since the End of the Nineteenth Century.] By Eckhart Ehlers. With a contribution by Grace Goodell, “Agricultural Production in a Traditional Village of Northern Khuzistan.” A publication of the Geographical Institute of Marburg University in the series, Marburger geographische Schriften, Vol. 64, 1975. x + 289 pp., 12 charts, DM33.
Unity in the Ghazals of Hafez. By Michael C. Hillmann. Minneapolis and Chicago: Bibliotheca Islamica, 1976. 181 pp.
Afghanistan in the 1970s. Edited by Louis Dupree and Linette Albert. New York: Praeger Publishers, 1974. 相似文献
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This paper deals with the evaluation of two-dimensional site-effects due to the seismic interaction between hills with various configurations and underground cavities. The time-domain boundary element method is used to evaluate the site-effects of hill-cavity interaction subjected to vertically propagating in-plane SV and P waves. The presence of an underground cavity and the hill topography are expected to induce significant effects on the surface ground motion. To further examine the contribution of the amplification ratio of the hill-cavity system, a fairly simple approach, which can compute the response spectra of the hill’s surface motion above a cavity based on the real input motions, is also used to input motions. 相似文献