Computer Program for Exact Analysis of Flat Slabs and Beam-Supported Slabs

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Two-way slab structures, owing to their economical and architectural advantages, are used extensively in civil engineering. In addition, these systems not only resist gravity loads and transfer them to the columns, but also sometimes in combination with other structural members make a lateral resisting system. Elastic analysis of equivalent frame method is a precise and comprehensive method which is widely used for analysis of two-way slab structures. Because of non-prismatic sections of slab-beams and columns, carry over and stiffness factors and fixed end moments of members with constant moment of inertia could not be used. Some tables have presented these values for different types of the slab-beams, columns and torsional members. Due to low precision of these tables and complicated and time-consuming procedure of equivalent frame method, precise analysis of two-way slab systems using equivalent frame method including stiffness degradation in all members, using slope-deflection equations, in the form of a prepared software is pursued in this research. Two analyses of example structures were performed and the efficiency and accuracy of the program were verified by comparing the hand-calculated results, results of a finite element approach and the developed computer program's results, which shows some differences in the support moments.

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