There are two primary methods to investigate the response of reinforced concrete (RC) structural components. Experimental testing method has been widely used to study the behavior of RC members under different loading conditions, while the results obtained have a high degree of accuracy, it is sometimes very time consuming and also can be very costly. Finite element (FE) analysis method as a numerical based solution technique, also is widely used to analyze behavior of structural components, and although the use of this method was very time consuming in several decades ago, however utilizing existing powerful software and hardware capabilities has made it easier nowadays.
An investigation is conducted on two-way RC beam-supported slabs using FE analysis technique to study their inelastic behavior when subjected to in-plane and out-of-plane loads. Two-way RC slab models were constructed for solid slab panels tested by Nakashima (1981) and the results obtained from FE analysis were compared with the experimental data.
Non-linear 3-D ANSYS models with smeared and discrete reinforcing steel were used. The obtained results from FE method indicated an acceptable agreement with experimental data. The verified FE model then was used to investigate the effect of floor openings on inelastic behavior of two-way RC slabs subjected to in-plane and out-of-plane loads. The opening was placed in the mid-region of the slab panel, where its size was varied from 6.25% to 25% of the panel area. To satisfy the strength requirements Section 13.4 of the American Concrete Institute code (ACI 318-11), additional reinforcement were placed in the slab around the opening. The results are presented and discussed.
It is observed that the failure mechanism changes in slab with larger opening where the steel yielding starts in rebars at the opening corners, and the failure damage at the ultimate load is more distributed. It is concluded that as the opening size increases, effect of out-of-plane (gravity) load on in-plane load capacity reduction of the slab decreases while the ultimate displacement at failure increases.
|Commitee:||Cross, Brad, Huang, Jianwei, Panahshahi, Nader|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 52/02M(E), Masters Abstracts International|
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