Letters of credit play a crucial role in international trade. In this study, we investigate the most preferable characteristics of letters of credit for the international trading companies in Iran. We seek to investigate which kind of guarantee (commercial L/C or standby L/C) they prefer to secure the performance of their client's obligations. Studied companies were 20 international trading companies in Tehran, from which 50 experts were participated in our survey study. For measuring the participants and their policy in using letters of credit, a questionnaire in Persian was designed. For analyzing data we used statistical tests (One-sample t-test). Data showed that being a guarantee, integration, documentary conditions, and secondary payment mechanism are four important reasons for international trading companies in Iran to use letters of credit in their contracts. Statistical results showed that "being a guaranteed credit" is the most important factor with a mean of 3.660 ± 1.135.Also, we found significant relationship between these four factors and the L/C usage policy (p 0.01, and p< 0.05). We concluded that they mostly prefer standby letters of credit for securing their transactions.
Tall buildings are subject to wind loads as one of the effective lateral loads. An analysis of the effect of wind on Milad Tower is presented in this research. The wind tunnel testing results and numerical modelling implemented in computational fluid dynamics (CFD) using ANSYS software. For the numerical simulation, the K-epsilon model has been used. The study evaluated the flow around the tower in several deformation states and compared it with a model where the tower is modeled rigidly in the wind tunnel. The maximum coefficient of negative pressure (suction) at the top of the tower structure equals to -1.95, which occurs at =90 o , and the maximum coefficient of the positive pressure equals +1. Since the buildings near the tower are located a short distance from the tower, the shed's structure, which is located near the tower, has also been investigated. With the aid of Tecplot software. The wind pressure coefficients obtained from the wind tunnel test were plotted. As part of the wind loading analysis in the single-span and two-span shed models, the model is rotated with a step of 5 o relative to the direction of wind application, and wind pressure is recorded.
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