Fire-Exposed Hyperstatic Concrete Structures: An Experimental and Theoretical Study

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Title: Fire-Exposed Hyperstatic Concrete Structures: An Experimental and Theoretical Study

Author(s): Y. Anderberg

Publication: Special Publication

Volume: 55

Issue:

Appears on pages(s): 439-460

Keywords: computer pro grams; fire tests; heat transfer; limit state design; loads (forces); momen ts; plates (structural members); rein-forced concrete; restraints; structural analysis; thermal properties

Date: 8/1/1978

Abstract:
Analytical predictions of thermal and mechanical behaviour of reinforced concrete structures exposed to differentiated complete fire processes including the cooling phase are presented and verified by tests. The modelling of the fire response comprises a heat flow ana-lysis in the first step and a structural analysis in the second step, based on two separate computer programs. The evaluated structural fire response is compared with the measured behaviour in a great number of experimental tests in which, the fire process and the external load level are widely varied. The experimental investigation refers to a well-defined hyperstatic structure, viz. a reinforced concrete plate strip fire-exposed on one side and completely fixed against rotation at both ends while axial movement is free to develop. The outline of the project is built on the philosophy of a functionally based, dif-ferentiated design procedure for fire exposed, load-carrying and separating structures. Such a design procedure refers to performance criteria and postulates that the real physical processes with res-pect to fire exposure, heat transfer and structural behaviour are predicted as far as possible.