How to Select the Fire-Resistant Calculation Model for the Completed Steel Structure

Abstract

Finite element model of the three-dimension steel frame of sorbic alcohol warehouse is built to study the response of the steel structure on fire. The material nonlinearity and geometrical nonlinearity being aroused by high-temperature are taken into account adequately during this computation. Shell elements are used to model the concrete floor slab，beams as well as columns. The rigid connection and flexible connection between the beams and column are considered respectively. In order to reduce the computing amount, the effects of the completed structure and the neighboring span have been explored under the local fire. It turns out that it has more effects on stresses and deflections in the neighboring span than that in others when the whole structure is under local fire. It has greater deflections when using the rigid connection than using flexible connection between the components. Meanwhile, according to the rules of the stresses and the deflections of the structure, the method of selecting the effective and reasonable simulating areas under the local fire is concluded. The conclusions are important for building the reasonable simulating areas on fire and for further studying the mechanical behaviors of the steel structure, also significant for providing references for the fire-resistant calculation of the completed steel structure.