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Application of rational methodology for evaluating fire resistance of concrete structures

Kodur V. K. R., Shakya A. M.

Materiały Budowlane

2014

nr 10

82--87

Current methods of evaluating fire resistance of concrete structures are mainly prescriptive in nature and developed utilizing data from standard fire tests. These methods may not yield realistic fire resistance, especially for new types of concrete, and geometric configurations subjected to realistic fire loading and restraint scenarios. Many of the drawbacks in current prescriptive approaches can be overcome through rational approaches for evaluating fire resistance. For undertaking such rational approaches, a nonlinear finite element based numerical model and input parameters namely, high temperature material constitutive models, realistic fire, load and support conditions data are required. In this paper, the applicability of rational approach for evaluating fire resistance is illustrated through a case study on typical prestressed concrete hollowcore slabs. Results from the study clearly show that rational approaches for fire resistance evaluation yields higher fire resistance than that obtained through prescriptive based approaches.