Waffle Slab Structures Under Vertical and Horizontal Loading. Volumes 1 and 2 (Estruturas de Lajes Fungiformes Nervuradas sob Accoes Verticais e Horizontais).

摘要

The thesis reports the research work carried out on the behavior of column supported waffle slabs. The research was mainly experimental, based on the construction and testing of nearly 80 sq m of reinforced concrete slab models. The aim of the study was the analysis of the bending, torsional and shear behavior of the waffle slab structures, and comprises a preliminary summary of the previous work. For the analysis of torsion and shear behavior 10 experimental models of waffle slab panels and two beams with the shape of the ribs were tested and analyzed. Theoretical models for the evaluation of the torsional stiffness and resistance to torsion and shear are proposed. The study of the bending behavior was based on the experimental analysis of a waffle slab model with 6x6 sq m in plan, supported on 16 columns. The model was tested under vertical and horizontal loadings. The experimental evolution of the cracking and moment distributions under vertical loading was analyzed. The influence of cracking, due to vertical and horizontal loading, on the behavior of the slab-column connections was studied. A procedure for the evaluation of the rotational stiffness of the slab-column joint is proposed.