Parameters affecting tensile membrane action of reinforced concrete floors subjected to elevated temperatures

A fire that occurs in a reinforced concrete (RC) structure accompanies a heating temperature, and this negatively affects the concrete material properties, such as the compressive strength, the bond between cement paste and aggregate, and the cracking and spalling of concrete. To appropriately measure the reduced structural performance and durability of fire-damaged RC structures, it is important to accurately estimate the heating temperature of the structure. However, studies in the literature on RC structures damaged by fire have focused mostly on structural member tests at elevated temperatures to ensure the fire resistance or fire protection material development; studies on estimating the heating temperature are very limited except for the very few existing models. Therefore, in this study, a heating temperature estimation model for a reinforced concrete (RC) structure damaged by fire was developed using a statistical Bayesian parameter estimation approach. For the model development, a total of 77 concrete test specimens were utilized; based on them, a statistically highly accurate model has been developed. The usage of the proposed method in the framework of the 500 °C isotherm method in Eurocode 2 has been illustrated through an RC column resistance estimation application.

Download Full-text

Finite element analysis of reinforced concrete beams at elevated temperatures

Nonlinear Finite Element Analysis of Composite and Reinforced Concrete Beams ◽

10.1016/b978-0-12-816899-8.00006-7 ◽

2020 ◽

pp. 83-100

Author(s):

Xiaoshan Lin ◽

Y.X. Zhang ◽

Prabin Pathak

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Reinforced Concrete ◽

Elevated Temperatures ◽

Concrete Beams ◽

Reinforced Concrete Beams ◽

Element Analysis

Download Full-text

On the nonlinear behaviour of reinforced concrete frames

Canadian Journal of Civil Engineering ◽

10.1139/l90-083 ◽

1990 ◽

Vol 17 (5) ◽

pp. 698-704 ◽

Cited By ~ 8

Author(s):

F. J. Vecchio ◽

S. Balopoulou

Keyword(s):

Reinforced Concrete ◽

Large Scale ◽

Load Capacity ◽

Concrete Strength ◽

Theoretical Modelling ◽

Nonlinear Behaviour ◽

Concrete Frames ◽

Membrane Action ◽

Ultimate Load Capacity ◽

Plane Frame

An experimental investigation is described in which a large-scale reinforced concrete plane frame is tested to study factors contributing to its nonlinear behaviour under short-term loading conditions. The test results indicate that frame behaviour can be significantly affected by second-order influences such as material nonlinearities, geometric nonlinearities, concrete shrinkage, tension stiffening effects, shear deformations, and membrane action. A nonlinear frame analysis procedure, previously developed taking these mechanisms into account, is shown to accurately predict most aspects of behaviour, including deflection response, ultimate load capacity, and failure mechansim. Aspects of the theoretical modelling which are in need of further improvement are also identified. Key words: analysis, behaviour, deformation, frame, large scale, nonlinear, reinforced concrete, strength, test.

Download Full-text