http://localhost:80/xmlui/handle/123456789/1062 2026-04-05T17:20:32Z http://localhost:80/xmlui/handle/123456789/7399 Title: Buckling behavior of laminated composite stiffened cylindrical shell panels having cutout for different parametric variations Authors: Sahoo, Sharmila Abstract: Buckling of composite stiffened cylindrical shell panels having cutout is analyzed using the finite element approach. Shell panel and stiffeners are modeled using first-order shear deformation theory and considering displacement compatibility at the stiffener-panel interface. Convergence and validation studies are conducted to establish the accuracy of the present approach. An attempt is made to maximize the uniaxial and biaxial buckling loads by varying the lamination, boundary conditions, load position, depth of stiffeners, and their arrangements. Parametric studies show that buckling load and mode shapes depend on the size of cutout, ratio of shell width to thickness, degree of orthotropy, and fiber orientation angle. The parametric variations considered here may help the practicing engineers to have an elaborate design aid for improving the buckling strength of such shell panels. Description: https://doi.org/10.1177/09544062221100613 2022-05-01T00:00:00Z http://localhost:80/xmlui/handle/123456789/7398 Title: Buckling characteristics of cut-out borne composite stiffened hyperbolic paraboloid shell panel Authors: Sahoo, Sharmila Abstract: The present study investigates buckling characteristics of cut-out borne stiffened hyperbolic paraboloid shell panel made of laminated composites using finite element analysis to evaluate the governing differential equations of global buckling of the structure. The finite element code is validated by solving benchmark problems from literature. Different parametric variations are studied to find the optimum panel buckling load. Laminations, boundary conditions, depth of stiffener and arrangement of stiffeners are found to influence the panel buckling load. Effect of different parameters like cut-out size, shell width to thickness ratio, degree of orthotropy and fiber orientation angle of the composite layers on buckling load are also studied. Parametric and comparative studies are conducted to analyze the buckling strength of composite hyperbolic paraboloid shell panel with cut-out. 2021-01-01T00:00:00Z http://localhost:80/xmlui/handle/123456789/7371 Title: Seismic Study on Tall Structures with RC Shear Walls: Static and Dynamic Analysis Authors: Saha, Akash Abstract: Structural design is the primary aspect of civil engineering. In India, multi-storied buildings are usually constructed due to high cost and scarcity of land. In order to utilize maximum land area, builders and architects generally propose symmetrical as well as asymmetrical plan configurations. The asymmetrical plan buildings, which are constructed in seismic prone areas, are likely to be damaged during earthquake. Earthquake is a natural phenomenon which can generate the most destructive forces on structures. Buildings should be made safe for lives by proper design and detailing of structural members in order to have a ductile form of failure. The concept of earthquake resistant design is that the building should be designed to resist the forces, which arises due to Design Basis Earthquake, with only minor damages and the forces, which arises due to Maximum Considered Earthquake, with some accepted structural damages but no collapse. This present analytical study comprises of seismic analysis various stored R.C. structures (from low-rise to mid-rise to high-rise) with regular or symmetrical plan. The following building models such as G+1, G+4, G+9 and G+24 storeyed have been taken into account. The building is modelled as a 3D space frame with six degrees of freedom at each node using the software STAAD PRO v8i v 14.2.4. All the building models are analysed using Equivalent Static analysis. The building models are located in zone IV with S.M.R.F. Furthermore, Response Spectrum Analysis is also conducted on the entire regular plan building models as well as irregular plan building models. Detailed seismic response and behavior are discussed well in this present study. 2020-01-01T00:00:00Z http://localhost:80/xmlui/handle/123456789/7370 Title: A generalized consolidation model under cyclic loading Authors: Paul, Monideepa Abstract: A generalized consolidation model is proposed to compute pore water pressure and degree of consolidation of cohesive soils subjected to long-term cyclic loading. The fundamental in-situ stress and Terzaghi’s principle of effective stress are adopted to formulate the proposed analytical model where undrained pore water pressure generation for cohesive soil is introduced. By employing Laplace transformation, a closed-form nonlinear solution for consolidation is derived. This paper presents a parametric study to investigate the effects of parameters like cyclic stress ratio, frequency, plasticity index of soil and confining pressure on consolidation during cyclic loading. Rate of consolidation is found to increase with increase in cyclic stress ratio and confining pressure and decrease in frequency of loading. Further, the proposed analytical model agrees well with the published data which indicate that it may be used by the practising engineers for prediction of consolidation under long-term cyclic loading. 2019-01-01T00:00:00Z