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Author: Ankit Kumar × End date: 2022 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Comparative study of irregular RC building with shear wall and steel bracing under seismic loading
    (G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145, 2022-09) Ankit Kumar; Ankit Kumar; Vaneeta Devi; Vaneeta Devi
    The requirement of a multi-storey buildings is increasing day by day, but these buildings are highly affected by lateral loads. These lateral loads can be resisted by improving the lateral load resisting capacity of the building by the use of shear wall and steel bracing in the building at suitable locations. In the present study, the analysis of G+10 irregular RC building with shear wall and steel bracing at different locations in the building has been performed. The seismic forces are considered as per IS: 1893 (Part1) - 2016 and dead load, live load and other finishing loads are considered as per IS: 875 Part 1 and 2 in the analysis of various models considered in the present study. The building is considered in seismic zone V with damping ratio of 5%. Seismic analysis has been done using Response Spectrum method of dynamic analysis. 3D models of building with shear wall and steel bracing at different locations have been modelled and analyzed using “ETABS” software. The response parameters namely base shear, storey drift and torsion are critically analyzed to quantify the effects of shear wall and steel bracing at different locations in building. It has observed that base shear and torsion increases with the use of shear wall and steel bracing in irregular building as the stiffness of the building increases. The storey drift in the building decreases due to the increased stiffness. Since torsion is the most critical factor leading to major damage or complete collapse of buildings therefore, it is very essential that irregular buildings should be carefully analysed and designed for torsion. The performance of considered irregular building for stipulated sizes with shear wall is found better than steel bracing systems. Shear walls are definitely good mechanism for lateral loads itigation but the position of shear walls in the building should be made judiciously. In the present study, the Shear walls at exterior corners (Model 5) has found perform better than other modal cases being considered in the analysis.
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    ThesisItemOpen Access
    Evaluation of finger millet [Eleusine coracana (L.) Gaertn.] germplasm collected from Uttarakhand hills for morphological descriptors and drought tolerance
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-01) Ankit Kumar; Chawla, H.S.
    The present investigation entitled “Evaluation of finger millet [Eleusine coracana (L.) Gaertn.] germplasm collected from Uttarakhand hills for morphological descriptors and drought tolerance” was conducted on 92 finger millet accessions and consisted of two parts viz., i) morphological characterization of finger millet germplasm; and ii) screening of finger millet germplasm for drought tolerance in in-vitro and greenhouse conditions. Morphological evaluation was done as per augmented block design-II for 34 characters (16 qualitative and 18 quantitative). All the genotypes have exhibited wide range for studied quantitative traits and for grain yield per plot genotypes GP-2016-609, GP-2017-502, GP-2017-381, GP-2017-733 and GP-2016-188 were the top performing. Estimates of genetic parameters indicates high PCV, GCV, heritability and genetic advance over mean for fodder yield per plot, biological yield per plot, harvest index, total tillers per plant, productive tillers per plant, finger number per ear, finger length, spike length and spikelet density per cm, which indicates predominance of additive gene action in expression of these traits. Correlation and path analysis revealed that improvement of grain yield in finger millet is possible through simultaneous manipulation of spikelet density per cm, finger number per ear, productive tillers per plant and harvest index. Mahalanobis D2 analysis grouped all the studied genotypes into nine clusters, among which genotypes of clusters V, III and IV could be used as potent donors for superior desired traits. High contribution towards diversity was shown by harvest index, grain yield per plot and fodder yield per plot. In-vitro drought screening has revealed that minimum reduction under water stress condition over control for germination percent, root length, shoot length, seedling length, root to shoot ratio and vigour index were shown by genotypes GP-2017-687, GP-2016-189, GP-2016-131, GP-2017-276, GP-2017-689 and GP-2017-687 respectively. Greenhouse drought screening based on eleven morphological traits has revealed that low reduction in grain yield per plant under water stress condition over control was shown by genotypes GP-2017-479, GP-2016-124, GP-2016-138, GP-2016-144 and GP-2016-142. Greenhouse drought screening based on five physiological traits revealed that maximum increment under water stress condition over control for leaf thickness was shown by genotype GP-2016-142, while minimum reduction for RWC, CTD, membrane stability and photosynthesis efficiency was shown by genotypes GP-2017-479, GP-2016-124, GP-2017-479 and GP-2016-193 respectively. Greenhouse drought screening based on five biochemical traits revealed that maximum increment under water stress condition over control for proline, chlorophyll a, chlorophyll b, total chlorophyll and carotenoid contents were shown by genotypes GP-2017-502, GP-2016-193, GP-2016-124, GP-2016-193 and GP-2017-687 respectively. On the basis of combined overall drought ranking, genotypes viz., GP-2016-124, GP-2016-144, GP-2017-579, GP-2017-275 and GP-2017-479 were identified as most drought tolerant.