Abstract:\nVietnam\'s economy is integrating with the global economy, leading to financial risk increase for investors because of the fluctuation of the market price or interest rate, exchange rate etc. These factors make financial losses for the investors. Therefore, the investors should have the risk management methods to minimize the financial losses from investment in the portfolio. From these issues, the author offers the methodology of the determined profitability ratio and standard deviation to assess the financial risk of the Vietnamese economy. These also help the investors have the best selection of the portfolio to minimize the financial losses. This model helps the investors have a result of the realized profit from the investors’ investment portfolios. This result also helps the investors assess the factors directly impacting on the investors’ capital as well as how to set up the optimal density of the investment portfolio and know how much expected profitability rate from the investment portfolio to maximize profit and how to invest?
The effects of story-by-story horizontal post-tensioning (PT) on multi-story buildings are investigated using staged construction analyses. The results include a determination that part of the PT force applied to an upper floor slab is diverted to floors below through flexure and shear of vertical structural elements. The finite element analysis program SAP 2000 is utilized here owing to its capabilities to predict the effect of story-by-story PT on performance of multi-story buildings. The numerical examples are performed on the 16-story post-tension flat slab building. This building is the new structure of the emergency hospital for the medicine college, zagazig university, Egypt. The design of structural frames incorporating post-tensioned concrete members should consider secondary actions, such as moments and shears, for both horizontal and vertical members due to staged PT construction, in addition to gravity and lateral loads. The results demonstrate the significance of the investigated parameters on the performance of the multi-story building. Finally, Conclusions which may be useful for designers, have been drawn, and represented.