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dc.contributor.supervisorKwatra, Naveen-
dc.contributor.supervisorSingh, Harvinder-
dc.contributor.authorSharma, Madhu-
dc.description.abstractThe skew slabs have various applications as a floor of bridges and buildings. This is pertinent when it is not possible to cross the river or gap at an angle of 900. The skew slab behaves differently in comparison to the normal slabs because of various factors, i.e. skew angle, aspect ratio, boundary conditions and placement of reinforcement. Also, it becomes extremely complicated when sometimes beams are provided along its unsupported edges to meet the serviceability criterion prescribed in the applicable design codes. Any change in the physical parameters of these factors causes a considerable change in the moment-field induced in the slab under given loading conditions. The available design guidelines/codes give a set of design moment coefficients for a particular set of the skew angles and the slab aspect ratio only; these are based on the empirical formulae and the related performance studies conducted on such slabs in the past. Design aids and plans suggested by Indian codes are applicable for standard skew angles, i.e. 150, 300, 450 etc. with selective spans only. However, in actual practices, numbers of cases are encountered wherein the skew angle and aspect ratio of the slab panel does not fit into recommended guidelines. This happens either due to the very high land cost and space limitations. In the present thesis, an attempt is being made to develop an improved theoretical formulation to predict the ultimate flexural capacity of laterally loaded reinforced concrete (RC) skew slabs. In the first phase of the study, an analytical model has been suggested for the analysis and design of laterally loaded skew slabs for different cases: 1) Single panel RC skew slabs simply supported from two opposite edges (straight and skew). 2) RC skew slab stiffened with internal inbuilt beams cast monolithically along the span resting over simple supports along the span at the centre and its outer boundaries. The experimental programme was also designed to validate the suggested analytical models and equations. In addition, these experimental results were provided for the calibration of finite element analysis (FEA), so that FEA can be reliably applied to generic skew slabs analysis. The results for the single panel RC skew slab and RC stiffened skew slab obtained from the suggested model compares favourably well with that obtained from the full scale experimental and numerical studies. In the analysis, skew angle, aspect ratio and beam depth are variable parameters and its combination results in a total of 13 cases for experimental and 22 cases for numerical study. For every case of single panel skew slab, the effect of skew angle, aspect ratio and boundary condition were investigated whereas for stiffened skew slab depth of internal beams also considered with skew angle and aspect ratio on the behaviour of slab. It was found that these parameters affect the behaviour of skew slabs. The hypothetical collapse mechanism for the skew slabs resting on the two opposite edges is found to be a true one. Actual crack pattern and the ultimate flexural capacity of the slab specimens, tested in the laboratory, are found to be in good agreement with the theoretical predictions and the simulated results. The outcome of the research will help the analyst to analyse/design the slab with more confidence who otherwise has to base their design on the guidelines formulated based on the empirical formulae and the related performance studies carried out on such slabs in last decades. A working illustration is also presented to demonstrate the validity and efficiency of the proposed design equationen_US
dc.publisherThapar Institute of Engineering & Technologyen_US
dc.subjectStiffened Slaben_US
dc.subjectSkew Slaben_US
dc.subjectMathematical Modellingen_US
dc.subjectReinforced Concrete Slaben_US
dc.subjectYield Line Patternen_US
dc.titleBehaviour of Reinforced Concrete Stiffened Skew Slaben_US
Appears in Collections:Doctoral Theses@CED

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