Analytical models for load capacities of variable thickness reinforced concrete slabs considering compressive membrane action and boundary effects

2021 ◽  
Vol 246 ◽  
pp. 113067
Author(s):  
Ying-Jie Zhu ◽  
Meng Zhou ◽  
Jian-Min Zhu ◽  
Xin Nie
Keyword(s):  
Reinforced Concrete ◽  
Variable Thickness ◽  
Boundary Effects ◽  
Analytical Models ◽  
Concrete Slabs ◽  
Membrane Action ◽  
Reinforced Concrete Slabs ◽  
Compressive Membrane Action

Membrane action in reinforced concrete slabs

1990 ◽  
Vol 17 (5) ◽  
pp. 686-697 ◽  
Author(s):  
F. J. Vecchio ◽  
K. Tang
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Load Capacity ◽  
Experimental Program ◽  
Concrete Slabs ◽  
Order Effects ◽  
Membrane Action ◽  
Deformation Response ◽  
Reinforced Concrete Slabs ◽  
Compressive Membrane Action

The formation and influence of compressive membrane action in reinforced concrete slabs is discussed. An experimental program is described, in which two large-scale slab specimens were tested under concentrated midspan loads. One slab was restrained against lateral expansion at the ends, while the other was free to elongate. The laterally restrained specimen developed high axial compressive forces, which resulted in a significant increase in flexural stiffness and load capacity. A nonlinear analysis procedure was used to model specimen behaviour. The analysis method was found to adequately represent important second-order effects, and thus gave reasonably accurate predictions of load–deformation response and ultimate load. Key words: analysis, concrete, deformation, load, membrane, reinforced, slabs, strength, tests.

Fire performance of reinforced concrete slabs: a numerical analysis

2021 ◽  
Author(s):  
Andreia Romero Fanton ◽  
Luiz Carlos de Almeida ◽  
Leandro Mouta Trautwein
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Finite Element Modelling ◽  
Concrete Slabs ◽  
Fire Performance ◽  
Membrane Action ◽  
Numerical Studies ◽  
Reinforced Concrete Slabs ◽  
Thermomechanical Behaviour ◽  
Load Carrying

<p>The emergence of tensile membrane action as a key load-carrying mechanism has increased experimental and numerical studies on the fire performance of concrete slabs since 2000, however, the different behaviour due to aggregate type is less studied in slabs numerical analysis. This paper presents a numerical analysis of the thermomechanical behaviour of reinforced concrete slabs exposed to fire, using Finite Element Modelling in ATENA and GiD. Results were validated against experimental data from the literature subjecting slabs to ISO834 and hydrocarbon time- temperature curves. 3 calibration steps were done to combine mechanical and thermal behaviours. A parametric analysis was carried out with calcareous and siliceous aggregates to provide information for safer slab design and consequent fewer accidents related to fire situation. The choice of aggregate type must always be considered in design.</p>

scholarly journals Experimental research of the impact of upper reinforcement on the tension membrane action of narrow three-span reinforced concrete slabs

2020 ◽  
Vol 310 ◽  
pp. 00056
Author(s):  
Miroslaw Wieczorek
Keyword(s):  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Experimental Research ◽  
Experimental Tests ◽  
Concrete Slabs ◽  
Membrane Action ◽  
Experimental Stand ◽  
Reinforced Concrete Slabs ◽  
Reinforced Steel ◽  
The Impact

The aim of the paper was to demonstrate the influence of reinforced steel parameters and quantity on the failure mechanism of four three-span models of reinforced concrete strips with the dimensions 7140×500×190 mm. Two models had only bottom reinforcement, while two were reinforced at the bottom and upper sides. The paper contains the description of the experimental stand and models along with the results of experimental tests which were compared with the results of the calculations based on traditional methods.

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