Nonlinear analysis on deflection of prestressed concrete bonded simply supported beam and slab subjected to fire

The temperature fields of the beam and slab were calculated by ANSYS program, and the nonlinear analysis on the deflection of the prestressed concrete bonded simply supported beam and slab subject to fire was performed by the compiled FORTRAN program. In the nonlinear analysis a fiber element model was adoped and the coupling effect of the load and temperature was taken into accounted. The bending moment versus curvature relationship in all sections along the span of the beam and slab was got through analysis. The deflections of the prestressed bonded simply supported beam and slab subject to fire were obtained using the method of conjugate beam. The calculation results by the program were compared with the experimental data in related references, and a good agreement was demonstrated. Besides, the nonlinear analyses were also done on the deflections of the large-span prestressed concrete bonded simply supported beam and slab respectively in ISO standard temperature rise conditions, and the results show that the large-span prestressed concrete bonded simply supported beam has a good fire resistance under the normal design load level.