A review on the experiments on ground floor slabs at the edge load case that took place from 2002 to 2011. Deflection and tensil - Research Paper Example

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Name: Course Instructor: Date: May 19, 2011 Review of Deflection and Tensile Stress Experiments on Ground Floor Slabs Load Case at the Edge between 2002 and 2011 Introduction According to Abu et al (2007) tensile membrane action can have a significant influence on the way composite floor structures perform…
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A review on the experiments on ground floor slabs at the edge load case that took place from 2002 to 2011. Deflection and tensil
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"A review on the experiments on ground floor slabs at the edge load case that took place from 2002 to 2011. Deflection and tensil"

The consideration of large deflections was found to be much less clear because there was a lack of understanding of the conditions that result in failure specifically in relation to concrete floor slabs. Experiments According to Foster et al (2004) large scale fire tests carried out in the multi-storey steel for building at Cardington suggests that concrete slab is highly resistant to fire. These tests indicate that the floor system does not collapse even when deformations are extreme. This resistance is attributed to the action of membrane forces which act in such a way as to maintain the integrity of the structure. Abu et al (2007) found that the structure has the ability to provide enough bending strength at low temperatures and so no enhancement from membrane action is necessary. However, as the temperature increases the flexural strength of the floor declines and can fail if sufficient membrane action is not mobilised. They concluded that tensile membrane action is of extreme importance to the real structure fire resistance of buildings. However, for this action to be effective the slab edges needs to be supported vertically. It is felt that the horizontal restraint is not really essential but can have a positive impact n performance. According to Zhang et al (2009) ArceloMittal and CTICM launched a project FRACOF in which a composite floor slab with dimensions of 8.725 x 6.990m was tested under ISO Standard fire for 120 minutes. The failure of a welding line at the joint of the reinforcement bars resulted in the slab failing the test. The fracture could they indicated could have been avoided by construction measures. Zhang et al (2009) indicates that in 2008 Guo Qiang Li and Na-si Zhang developed a new method in order to estimate the load capacity of composite floor slab under fire condition while taking into consideration membrane action. Zhang et al (2007) carried out a total of four (4) full scale slab tests. These tests were performed at the Tongji University in China under the sponsorship of the National Science Foundation of China. The tests consisted of measurements of the temperature of the furnace; slabs and reinforcement; the strains of the reinforcement concrete; and the deflection of slabs. Four (4) pieces of composite floor slabs of dimensions 5.232m x 3.72m with unprotected steel decks were used in the test. They were contributed with profiled steel sheet that was commonly used in China. The thickness of the deck was 1mm with strengths greater than 270N/mm2. The total depths of the slabs were 146mm and the concrete on op of the decks had thickness of 70mm. The reinforcing mesh of the slabs consisted of smooth reinforcement bars with gird size of 150mm x 150mm. The diameter of the reinforcement bar was 8mm and the grade of the steel Q235. The protective layer of reinforcement was he same thickness for all except one of the floor slab. The slabs, primary and secondary beams were all designed in accordance with two specific Chinese code one of which is dated 2003. Zhang et al (2009) also pointed out that in Cardington test, it had been found that the slabs were fractured at the boundary and so in order to make the tests similar the reinforcement was not anchored at the Read More
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