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Fire Response of Reinforced Concrete Slabs
A mathematical procedure is described for predicting displacement and stress histories of reinforced concrete slabs in fire environments using a computer program, FIRES-SL (FIre REsponse of Structures - SLabs). The temperature distribution histories used in FIRES-SL are obtained either from experimental results or from a one-, two-, or three-dimensional thermal analysis based on selected fire models. In a fire environment, thermal gradients and dilatation are sources of internal stress from local restraints within the slab and global restraint from the overall structural system. Structural response is determined in terms of displacements, internal forces, stresses and strains in concrete and steel reinforcement, and current states of concrete (cracking and crushing) and steel reinforcement (yielding). FIRES-SL uses a nonlinear finite element approach coupled with time step integration. Within time steps, an iterative approach is used to find a deformed shape which results in equilibrium between forces associated with external loads and internal stresses. The solution method is general and can be used for any specified slab shape, specified boundary conditions, and placement of reinforcement. Numerical solutions are compared to available experimental results. Comparisons between solutions from computer program FIRES-SL and experimental results show that predicted response is accurate to within 5 to 15% of observed behavior.
Fire Response of Reinforced Concrete Slabs
A mathematical procedure is described for predicting displacement and stress histories of reinforced concrete slabs in fire environments using a computer program, FIRES-SL (FIre REsponse of Structures - SLabs). The temperature distribution histories used in FIRES-SL are obtained either from experimental results or from a one-, two-, or three-dimensional thermal analysis based on selected fire models. In a fire environment, thermal gradients and dilatation are sources of internal stress from local restraints within the slab and global restraint from the overall structural system. Structural response is determined in terms of displacements, internal forces, stresses and strains in concrete and steel reinforcement, and current states of concrete (cracking and crushing) and steel reinforcement (yielding). FIRES-SL uses a nonlinear finite element approach coupled with time step integration. Within time steps, an iterative approach is used to find a deformed shape which results in equilibrium between forces associated with external loads and internal stresses. The solution method is general and can be used for any specified slab shape, specified boundary conditions, and placement of reinforcement. Numerical solutions are compared to available experimental results. Comparisons between solutions from computer program FIRES-SL and experimental results show that predicted response is accurate to within 5 to 15% of observed behavior.
Fire Response of Reinforced Concrete Slabs
Z. Nizamuddin (author) / B. Bresler (author)
1977
45 pages
Report
No indication
English
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