In this work, the simplified forms of governing differential equations are employed to analyse the laminated composite plates subjected to buckling. Effect of orthotropic material via variation in the E1/E2 ratio on the buckling parameters is verified and corresponding results are provided. With the developments in the modern technology, composites have found a significant role in applications in aerospace industry. Under the compressive in-plane loads, the composites undergo buckling. Hence, it is crucial to observe and study the buckling characteristics of laminated composites with effect of material properties. We have obtained the results of the buckling loads of a laminated composite having a cross-ply lamination scheme of plates with simply supported and clamped boundary conditions. Effect of the orthotropic material on these parameters is studied via the present study.

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Steel construction is used more often these days as an alternative to the R.C.C. when light weight, high strength, large-span structures with a faster erection are required. Extensive studies have been done by researchers to study the seismic performance of reinforced concrete and steel structures, both in terms of elastic and inelastic behavior. Composite construction is also a recent advancement in the building industry with similar advantages. However, no emphasis has been given to the comparison between the inelastic behavior of steel and composite structures when subjected to lateral loads. This study compares the inelastic behavior of steel and a composite frame designed to have the same plastic moment capacity for structural members. The responses, such as the formation of hinges, story drifts, story displacements, lateral stiffness, ductility, maximum strength, energy dissipated, joint accelerations, and performance points, are compared with the aid of the building analysis and design software ETABS-18. For this, response spectrum analysis, pushover analysis and nonlinear direct integration time history analysis have been performed on both frames. For design and analysis, international codes such as IS 800-2007, IS 875 (Part I, II, IV), IS 1893-2002, AISC 360 (16 & 10) and FEMA 440 have been used. Part of this study also aims at comparing the response of these frames when subjected to near field and far field earthquakes. It can be concluded from the results that the post yield performance of the composite frame is superior to that of the steel frame when seismically excited.