Combined axial and flexural loads in short reinforced concrete columns in fire: ultimate limit state curves using 500 °C isotherm method

Abstract

Ultimate limit state curves of short reinforced concrete columns in fire situation are going to be presented in this paper. The authors created a code developed in Matlab. It makes a discretization of the cross sections of the columns and calculates the equilibrium integrals of them. The curves were plotted with the code considering the 500 °C isotherm method.

Advanced computer model for analysis of reinforced concrete and composite structures at elevated temperatures

“…Using the characteristics of the studied physical problem, the NASEN program can be applied to compute the effective section representative of a concrete region of the inner crosssection the isotherm of 500ºC for 30, 60, 90 and 120 min of exposure to fire, assuming that the concrete with temperature higher than 500ºC is completely neglected, as shown in Figure 9. In a simplified way, the concrete contained in the interior region is not affected by fire, considering the properties of materials at ambient temperature, however, exceptional coefficients are adopted in the elaboration of the structural design [44]. Furthermore, another important analysis in the context of fire design of structures is the investigation of the influence of the concrete column cover.…”

Fire behavior of shallow prestressed hollow core slabs from computational modeling

“…It is important to deepen the knowledge about the behavior of hollow core slabs exposed to fire. There are several studies in the literature about reinforced concrete beams and columns exposed to fire [10][11][12][13], as well as steel-concrete composite structures [14][15][16][17]. There are also several studies about the behavior of hollow core slabs exposed to fire, either by tests or computational modeling [18][19][20][21][22][23][24][25][26][27].…”