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原文传递 Reduced-Order Modeling of Composite Floor Slabs in Fire. II: Thermal-Structural Analysis

题名：	Reduced-Order Modeling of Composite Floor Slabs in Fire. II: Thermal-Structural Analysis
正文语种：	英文
作者：	Jian Jiang; Joseph A. Main, M.ASCE; Jonathan M. Weigand, A.M.ASCE;Fahim Sadek, M.ASCE
作者单位：	National Institute of Standards and Technology
关键词：	Thermal-structural analysis; Composite slab; Reduced-order model; Shell element; Validation; Explicit analysis
摘要：	This paper describes a reduced-order modeling approach for the thermal and structural analysis of fire effects on composite slabs with profiled steel decking. The reduced-order modeling approach, which uses alternating strips of layered shell elements to represent the thick and thin portions of the slab, allows both thermal and structural analyses to be performed using a single model. The modeling approach accounts for: (1) the trapezoidal profile of the concrete in the ribs; (2) the structural resistance provided by the steel decking, including the webs of the decking; and (3) the orthotropic behavior of the decking, which provides greater resista nee along the ribs than transverse to the ribs. The modeling approach is validated against experimental data from one-way composite slabs tested under ambient-temperature, a oneway composite slab tested under fire conditions, and a two-way composite slab tested under fire conditions. Both implicit and explicit solution schemes are evaluated for the structural analysis, and the results show that it is feasible to scale down the hours-long fire duration to a simulation time of seconds in an explicit dynamic analysis, without adversely affecting the accuracy of the results. The steel decking contributes significantly to the structural resistance at an ambient temperature, but as expected, its contribution is found to decrease rapidly under fire exposure. The modeling approach can account for the location of reinforcing bars (i.e., at a specified depth in either the thick or thin portion of the slab), and it is found that reinforcement location can have a significant effect on the structural response, because heat transfer in the composite slab results in higher temperatures in the thin portions of the slab between the ribs.
出版日期：	2020
出版年：	2020
期刊名称：	Journal of Structural Engineering
卷：	Vol.146
期：	No.06
页码：	04020081