Flooring Systems with Pre stressed Steel Stringers for Cost Benefit
Of the existing flooring system types, steel flooring systems are often times overlooked due to their material cost. However, this problem can be addressed by prestressing steel and reducing the weight of each element. Through a three-part analysis, this research concludes that using prestressed steel for flooring systems, when in an optimal configuration, is economically viable. The first part focuses on tests to determine an optimal stringer shape for the flooring system between I-beams and trusses.
Once it was determined that truss stringers required less steel for their span, stage two focused on finding an appropriate tendon profile with the goal of cost reduction in mind. The final stage used a comparative cost analysis to ensure that the flooring system with the stringer shape and prestressing tendon profile selected in the previous steps were economically beneficial to those who might choose to adopt this method. The results show that the prestressed truss with straight tendons has maximum efficiency.
Prestressing techniques for steel beams were developed many years ago, both for the construction of new structures and for the rehabilitation of existing structures. A number of prestressed steel structures in the following years have been built throughout the world, especially in the USA, Russia, and Germany, which demonstrates that prestressed steel beams can present both structural and economic advantages when compared with non-prestressed (traditional) beams. However, the prestressed steel technique has been adopted mainly for bridges and rarely for the floor/roof structures.
Prestressing is the process of artificially creating stresses that would oppose the stresses later applied by a load. The two loads, prestressed and regular, increase the elastic work of the material. On the other hand, the basics of prestressing lie in the fact that the stresses are developed artificially which are opposite to those stresses created due to loading. When a prestressing load f0 is induced in a structure which inverses stress due to the action of the loading, this stretches the elastic work of the material.
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