تهيه برنامه زير قاب براي تحليل دقيق دال هاي تخت و متكي بر تير

COMPUTER PROGRAM FOR ANALYSIS OF SUBSTITUTE FRAME OF FLAT SLABS AND SLABS SUPPORTED ON BEAMS

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. The elastic analysis of an equivalent frame method is a precise and comprehensive method that is widely used for the analysis of two-way slab structures. Because of the nonprismatic sections of slab-beams and columns, carry over and stiffness factors and the fixed end mo¬ments of members with a constant moment of inertia could not be used. Some tables have presented these values for different types of slab-beam, column and tor¬sional member. Due to the low precision of these tables and the complicated and time-consuming procedure of the equivalent frame method, the precise analysis of two- way slab systems, using an equivalent frame method, including stiffness variation in all members, using slope- deflection equations, in the form of developed software, is pursued in this research. Two analyses of example structures were performed and the efficiency and ac¬curacy of the program were verified by comparing the hand-calculated results, including a finite element ap¬proach and the developed computer program results, which show some differences in snpport moments.