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Study on the Stiffness of Cold-formed Steel Floor Systems

Author: LiYing
Tutor: ZhouXuHong
School: Chang'an University
Course: Structural Engineering
Keywords: cold-formed steel floor stiffness pseudo-plate method orthotropic plate equivalent stiffness vibration
CLC: TU392.1
Type: Master's thesis
Year: 2009
Downloads: 89
Quote: 2
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Abstract


The assembled floor, which is composed of cold-formed steel jiost, orient strand board (OSB) and gypsun board, is the main horizontal structure member in the cold-formed steel residential buildings. In this article the stiffness and vibration of the assembled floor is researched, and a design method is offered.Two aspects experiment about full scale cold-formed steel assembled floor were done. (1) flexural test of the cold-formed steel assembled floor samples with two different spacing of self-drilling screws. Measured the deflection of the samples, and test results show that this two spacing of self-drilling screws did not affect the stiffness of the floor in the elastic region. (2) Analysis change boundary condition of the samples vibration.Measure the deflection under the 1kN static load, and the frequency and damping of the samples.Propose the vibration design criteria and design method of the assembled floor.In this article the cold-formed steel assembled floor is simplified into a mechanical model of orthotropic plate system. Then, the deflection differential equation of the assembled floor is deduced and the simplified formula to calculate the mid-span deflection is proposed. Moreover, the formulas to calculate the equivalent stiffness of the assembled floor are presented by using pseudo-plate method. Composed to test result, they are very identical and the formulas have been verified to be valid. In addition, this article define the assembled floor whose width is "s" is a unit. Then equal this unit to a freely supported beam. Compared to the method of equation of orthotropic plate and test result, the equivalent beam method also meet accuracy requirements, and the calculation is very simple. Besides, according to the research methods of foreign and domestic researchers and the experiment about vibration of this floor , the method that control the vibration by limiting the deflection of the assembled floor is suggested in this paper.Finally, the factors influencing equivalent stiffness of the assembled floor have been analyzed in this article. And through the enormous amount of stiffness calculation, several ways of approaching the floor vibration problem are given. Finally, the method to design the assembled floor proposed in this article has been verified to be valid by a design example.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Various types of steel > Steel structure
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