In the present paper the fire behaviour of full-locked coil ropes under axial loading conditions is addressed. Since there are no standards for these structural elements, ISO 834 standard curve was considered as fire model for its severity. The analysis of full-locked coil ropes fire behaviour was carried out both from the experimental and numerical point of view, thus obtaining a complete description of rope responses. Two distinct full-locked coil ropes were tested and heat fluxes, temperature fields in the rope cross-section and fire endurance times were determined. An experimental campaign, aimed to establish how wires mechanical properties change with temperature, was also carried out. Subsequently, a parametric Finite Element model (FE) able to predict the rope response, undergoing to the experimental thermal and mechanical loads, was implemented, thus obtaining the time evolution of damage and the failure mechanisms for the rope. The numerical model was then validated by comparing the predicted fire endurance times with those obtained from the experimental tests and a very good agreement was found. A method for determining the fire endurance times of full-locked coil ropes by using the numerical model, once the material properties and loading conditions are established, was thus defined
Experimental and numerical analysis of full-locked coil ropes fire behaviour
MONELLI, BERNARDO DISMA;
2009-01-01
Abstract
In the present paper the fire behaviour of full-locked coil ropes under axial loading conditions is addressed. Since there are no standards for these structural elements, ISO 834 standard curve was considered as fire model for its severity. The analysis of full-locked coil ropes fire behaviour was carried out both from the experimental and numerical point of view, thus obtaining a complete description of rope responses. Two distinct full-locked coil ropes were tested and heat fluxes, temperature fields in the rope cross-section and fire endurance times were determined. An experimental campaign, aimed to establish how wires mechanical properties change with temperature, was also carried out. Subsequently, a parametric Finite Element model (FE) able to predict the rope response, undergoing to the experimental thermal and mechanical loads, was implemented, thus obtaining the time evolution of damage and the failure mechanisms for the rope. The numerical model was then validated by comparing the predicted fire endurance times with those obtained from the experimental tests and a very good agreement was found. A method for determining the fire endurance times of full-locked coil ropes by using the numerical model, once the material properties and loading conditions are established, was thus definedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
