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Research on Fire Behavior of Cable Tensioned Pre-stressed Steel Structure

Author: SunHongLiang
Tutor: WangXinTang
School: Ningbo University
Course: Structural Engineering
Keywords: Cable tensioned Pre-stressed steel structure Fire Stainless steel tube
CLC: TU394
Type: Master's thesis
Year: 2013
Downloads: 3
Quote: 0
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Abstract


Fire is one of the biggest disaster threats to human life and property safety, how to reduce theharm of fire has been the subject of concern. Pre-stressed steel structure has the advantages ofsaving material, can improve the bearing capacity, give full play to the strength potential of thematerial, can obtain greater economic benefits, so its application is more and more widely. Thesignificant shortcomings of pre-stressed steel structure is that it isn’t refractory. Cable tensionedsteel structure is formed by tensioning the high strength cable. This structure has a large internalenergy. High strength cable will relax under fire conditions and lead to the loss of prestrss, and thismay cause the sudden failure of the structure, which poses a serious threat to human life andproperty. Therefore, there is important theoretical significance and value of engineeringapplications to study the mechanical properties of the cable tensioned pre-stressed steel structureunder fire conditions.Stainless steel material has good mechanical properties and excellent corrosion resistance,especially with higher high temperature strength. The property of twelve cable tensioned steel rooftrusses which are made of SUS304stainless steel thin-wall circular tube was investigated by thefire and after fire experiments, the effects of some parameters, such as temperature, structuralstiffness, tension method and load size are discussed. Then the finite element analysis softwareMarc are used to analyze the mechanical behavior of the set of roof trusses in the actual firetemperature which had been measured in experiments and the simulation results are compared withexperimental results.The results show that the pre-stressed space truss has a higher carrying capacity and strongdeformation capacity, the main form of structural damage is the overall instability; structuraldamage is mainly due to the relaxation of the high strength cable under high temperature, and sothe prestress loses a lot. The effects of single factor on the structure performance under the sameconditions is as follows: under fire the fire temperature has a very important influence on thedeflection of structure and the deflection of the truss is more larger as higher the temperature;greater the structural stiffness, the smaller the deflection will occur in the fire; the greater loadamount, structure deflection occurred under fire will be greater; in reducing the structuraldeflection on fire, better effect of two times of tension than a tension; the prestress value is greater, the structural deflection occurred in the fire will be smaller. The results of simulation are basicallyconsistent with the results of experiment and so has a high reference value.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Prestressing steel
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