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    Simplified Prediction of the Thermal and Mechanical Behavior of a Cold-Formed Steel Composite Floor at Room and Elevated Temperatures

    Source: Journal of Structural Engineering:;2016:;Volume ( 142 ):;issue: 006
    Author:
    Wei Chen
    ,
    Jihong Ye
    DOI: 10.1061/(ASCE)ST.1943-541X.0001484
    Publisher: American Society of Civil Engineers
    Abstract: This paper presents a simplified method to predict the thermal and mechanical behavior of a new cold-formed steel floor system at room and elevated temperatures. A four-point bending test of such a floor assembly was performed at room temperature, and an efficient method to estimate the elastic rigidity and strength of the floor system was verified. The temperature progression of the floor section in a fire situation was well predicted based on the implicit finite difference method, taking into account the effects of ceiling materials falling off. A thermal-mechanical model was then developed by simplifying the floor system to a laterally restrained joist subject to constant vertical load and a non-uniform temperature distribution. The time-dependent vertical deflection of the floor joist was well predicted, whereas the response in the final stage of fire exposure was overestimated, probably due to the severe joist degradation and the neglected contribution of the autoclaved lightweight concrete subfloor. In addition, the fire-resistance time estimated by the simplified formula was found to compare well with the previous experimental results.
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      Simplified Prediction of the Thermal and Mechanical Behavior of a Cold-Formed Steel Composite Floor at Room and Elevated Temperatures

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4237254
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    • Journal of Structural Engineering

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    contributor authorWei Chen
    contributor authorJihong Ye
    date accessioned2017-12-16T09:00:01Z
    date available2017-12-16T09:00:01Z
    date issued2016
    identifier other%28ASCE%29ST.1943-541X.0001484.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4237254
    description abstractThis paper presents a simplified method to predict the thermal and mechanical behavior of a new cold-formed steel floor system at room and elevated temperatures. A four-point bending test of such a floor assembly was performed at room temperature, and an efficient method to estimate the elastic rigidity and strength of the floor system was verified. The temperature progression of the floor section in a fire situation was well predicted based on the implicit finite difference method, taking into account the effects of ceiling materials falling off. A thermal-mechanical model was then developed by simplifying the floor system to a laterally restrained joist subject to constant vertical load and a non-uniform temperature distribution. The time-dependent vertical deflection of the floor joist was well predicted, whereas the response in the final stage of fire exposure was overestimated, probably due to the severe joist degradation and the neglected contribution of the autoclaved lightweight concrete subfloor. In addition, the fire-resistance time estimated by the simplified formula was found to compare well with the previous experimental results.
    publisherAmerican Society of Civil Engineers
    titleSimplified Prediction of the Thermal and Mechanical Behavior of a Cold-Formed Steel Composite Floor at Room and Elevated Temperatures
    typeJournal Paper
    journal volume142
    journal issue6
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0001484
    treeJournal of Structural Engineering:;2016:;Volume ( 142 ):;issue: 006
    contenttypeFulltext
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