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RISS 인기검색어
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- 저자 : Hooshang Yazdani (검색결과 3 건)
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Performance-based reliability assessment of RC shear walls using stochastic FE analysis
Arina Nosoudi,Hooshang Dabbagh,Azad Yazdani 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.6
Performance-based reliability analysis is a practical approach to investigate the seismic performance and stochastic nonlinear response of structures considering a random process. This is significant due to the uncertainties involved in every aspect of the analysis. Therefore, the present study aims to evaluate the performance-based reliability within a stochastic finite element (FE) framework for reinforced concrete (RC) shear walls that are considered as one of the most essential elements of structures. To accomplish this purpose, deterministic FE analyses are conducted for both squat and slender shear walls to validate numerical models through experimental results. The presented numerical analysis is performed by using the ABAQUS FE program. Afterwards, a random-effects investigation is carried out to consider the influence of different random variables on the lateral load-top displacement behavior of RC members. Using these results and through utilizing the Monte-Carlo simulation method, stochastic nonlinear analyses are also performed to generate random FE models based on input parameters and their probabilistic distributions. In order to evaluate the reliability of RC walls, failure probabilities and corresponding reliability indices are calculated at life safety and collapse prevention levels of performance as suggested by FEMA 356. Moreover, based on reliability indices, capacity reduction factors are determined subjected to shear for all specimens that are designed according to the ACI 318 Building Code. Obtained results show that the lateral load and the compressive strength of concrete have the highest effects on load-displacement responses compared to those of other random variables. It is also found that the probability of shear failure for the squat wall is slightly lower than that for slender walls. This implies that β values are higher in a nonductile mode of failure. Besides, the reliability of both squat and slender shear walls does not change significantly in the case of varying capacity reduction factors.
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Moussa Ahmadian,Hooshang Yazdani,Ehsan Mehri 아시아테플 2019 The Journal of Asia TEFL Vol.16 No.2
In early written corrective feedback studies, there were a lot of attempts to test if the feedback types are effective. This study was based on the assumption prevailing in the new era of studies of written corrective feedback, that feedback is effective. Firstly, it aims to compare the think-aloud protocols of the preferred and unpreferred feedback types which were chosen by 20 English learners (10 in preferred, and 10 in unpreferred feedback). To this aim, learners were asked to write diaries for six weeks. In each session, concurrent think-aloud protocols were employed and learners' verbal reports were extracted, and their mental processes were coded through developing a table of mental operations. In the second part of the study, the relative effectiveness of the preferred and unpreferred feedback was measured. Using the Chi-square goodness-of-fit test, the findings of the first part showed a significant difference between the mental operations for each feedback type. The results for the second part suggested that there is a significant difference between the effectiveness of the preferred and unpreferred feedback types. This latter finding indicates that the preferred feedback can facilitate the development of the accuracy in L2 learners' writing more than the unpreferred feedback.
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Husain Abdulhay,Moussa Ahmadian,Hooshang Yazdani,Majid Amerian 아시아영어교육학회 2020 The Journal of Asia TEFL Vol.17 No.2
The recent trend in foreign language education research is turning toward self-regulated learning and its linkage with goal orientations. Self-regulated learning is the learning propelled by self-induced thoughts, feelings, strategies, and behaviors toward goal attainment (Schunk & Zimmerman, 1998). Goal orientations attempt to identify personal and contextual reasons lying behind an action (Wolters, 2004). This study sought to examine the relationship between goal orientations (mastery-approach, mastery-avoidance, performance-approach, and performance-avoidance goals) and writing selfregulation of Iranian university EFL learners. Survey instrument, designed by Lichtinger, Kaplan, and Gorodetsky (2006), was administered to a sample of 116 sophomore students, attending essay writing courses. Pearson product-moment correlation and regression technique were used for data analysis. The strongest correlation was found between personal performance-approach and performanceavoidance goals. Personal mastery and performance goals and mastery goal structure were associated significantly and positively with self-regulation in writing. Efficacy was significantly related to goal orientation measures. Goal orientations contributed to the prediction of self-regulation in writing. Moreover, performance-approach goal structure was only found to predict positively the writing achievement. Overall, the findings imply that understanding the nature of goal orientations enables writing self-regulation and achievement to be aligned.
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