A Finite Difference Procedural System for Long-Time Floor Deflection Analysis

Application to Flat Plate Structures

Abstract

For long-time deflection analysis of two-way slab systems we have proposed finite difference procedures : initially to calculate their deflection in flexure, allowing for both structural cracking in terms of Branson's effective stiffness and time-dependency ; then to consider the additional effect of elongation of reinforcement anchorage. Those methods earlier tested on all-edge-fixed cases for slab-beamgirder systems are currently applied to RC and PRC flat plates, as a unified analytical system to cover major structural variations. Solutions thereby obtained are examined in comparison with available overseas flat plate deflection measurements and are used for checking slab design thickness exempt from deflection hazards.