Abstract
Abstract The composite structures formed by the association of steel profiles with concrete have shown to be an advantageous alternative, improving the behavior of the steel structures concerning their load capacity, stiffness, and durability, under fire conditions. The concrete-filled tubular columns have become an attractive alternative for the civil construction area, offering constructive and esthetic advantages. The Eurocode 4 (EN 1994-1-2, 2002) and ABNT NBR 14323:2013 show simple methods for the design of the composite columns under fire situations. Nevertheless, these present limitations in their application. In addition, regarding the determination of the temperature field in the cross section, the Eurocode 4 (EN 1994-1-2, 2002) describes a specific procedure for columns with section profile covered with concrete, but it is neglectful about concrete-filled tubular columns. The goal of this paper is to present a simplified procedure to determine the temperature registered in concrete-filled steel columns and apply the procedure to columns with square section tubes. The temperature distribution was determined by simulations using the computer package ABAQUS (Dessault Systemes Simulia Corp. 2013). After the studies, it has been considered that the procedure described in this paper is an effective alternative for the determination of the field's temperature and for the application of the design of the concrete-filled columns under fire conditions.
Highlights
The composite columns formed by steel tubes filled with concrete have shown to be an attractive alternative, for both esthetics and execution
Setting the temperature field in structural elements is critical for the design under a fire condition, and regarding composite columns with steel tubes filled with concrete, there are no practical procedures, neither in the national normative codes nor in the Eurocode
The equivalent temperatures obtained by numerical models, described at the concrete core and steel tube, are shown in table 6: Table 6 Equivalents temperatures
Summary
The composite columns formed by steel tubes filled with concrete have shown to be an attractive alternative, for both esthetics and execution. The national normative codes, for the specific case of designing composite steel and concrete columns under fire conditions, describe tabular and simplified analytical methods that mention, briefly, advanced methods. Setting the temperature field in structural elements is critical for the design under a fire condition, and regarding composite columns with steel tubes filled with concrete, there are no practical procedures, neither in the national normative codes nor in the Eurocode. Lie (1994) developed an analytical procedure to determine the temperature field in composite columns with circular section steel tubes filled with concrete. Lie and Irwin (1995) extended this procedure for composite columns with rectangular steel tube filled with concrete, such procedures have proved difficult for practical application Lie (1994) developed an analytical procedure to determine the temperature field in composite columns with circular section steel tubes filled with concrete. Lie and Irwin (1995) extended this procedure for composite columns with rectangular steel tube filled with concrete, such procedures have proved difficult for practical application
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