Failure Investigation of Reinforced Concrete Columns Exposed to Fire

Moudar Hamed Zgoul, Hashem Saleem Alkhaldi, Saad Mohammad Habali, Mu'tasim Soud Abdel-jaber, Bassam Mohammed Ziadeh

Abstract


In this work, the probability of failure with time of reinforced concrete columns subjected to a high temperature is investigated. This study is of great concern, because under the effect of high temperature, the material properties of steel reinforced concrete degrade drastically. Different columns are taken under consideration by varying a fixed s et of parameters; these parameters include: the cross-section of the column, arrangement of the steel bars, diameter of the steel bars, distance of steel-bar center from column center, number of bars used in one column, reinforcing ratio (As/Ac), surface emissivity, and fire temperature. The technique of finite element analysis was used to calculate the temperature distribution with time over the column’s cross-sectional area using suitable computing machines. Rising temperature in the column leads to a decrease in the load-carrying capacity, which leads to a probable collapse of the building at a critical strain of ε = 0.3%. Out of the several cases which were deeply investigated, it was found that the time range needs to cause failure in column is between 140 to 191 minutes depending on the pre-mentioned study parameters.

Keywords


Column Load Capacity, Convection-Conduction-Radiation Heat Transfer, Finite Element Method, Fire in Buildings, Fire Resistance, Reinforcing Concrete Column

Full Text:

PDF

Refbacks

  • There are currently no refbacks.