http://dspace.dtu.ac.in:8080/jspui/handle/123456789/126 2026-04-28T05:26:14Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/18950 Title: SEISMIC ANALYSIS OF MASONRY STRUCTURE Authors: DEOL, VIDIT Abstract: From the beginning of construction history, masonry have been most widely used material Because of its light weight, great durability, fire resistance, thermal insulating characteristics, relatively simple method of construction and execution, and low cost, masonry has been the most extensively used material in construction history. Apart from possessing such features, masonry is thought to have several disadvantages, such as distinct directional (orthotropic) qualities. weak strength, mortar connections without proper thickness, low interface binding strength between brick and mortar, poor treatment and improper methods of installation, etc., Chourasia, A. et. al. (2017) [6] . Besides, having weak strength and weak seismic behaviour masonry is still used heavily in construction for structures all around the world notably for low rise buildings up to three floors, as well as antique and medieval structures. Masonry can be used in construction with or without reinforcement; however, providing reinforcement improves masonry's seismic performance. Confined masonry is a relatively new type of masonry that has been presented, where light-reinforced frame elements (tie beams and columns) are utilized to enclose a masonry wall, the system acts as a single unit under load, providing ductility and strong seismic properties. Confined masonry has been found to be superior to reinforced masonry in some cases. In this report a residentials G+3 building in, Delhi has been studied, building in its natural form is constructed of masonry single brick thick with 250 mm concrete slab. The building is further modelled in ETABS (2018) [12] software with masonry as thin shell element of 230 mm thick and concrete slab of 250 mm thickness and dead, live and seismic load is applied on this building. Building is further modified and modelled in software with a 1) lintel band and 2) with confining elements (confined masonry) and change is seismic behaviour and capacity is studied. 2021-08-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/18925 Title: SEISMIC RESPONSE OF REINFORCED CONCRETE FRAME RESTING ON HILL SLOPES Authors: VERMA, SAURAV KUMAR Abstract: The Constructions done in the hilly regions are more vulnerable seismically in contrast with the structures built in flat terrains. The structures constructed in hilly regions are usually irregular, these structures are irregular both in mass and stiffness. Constructions done on the sloping ground is different from usual structures since they're asymmetrical in both horizontal and vertical directions. Columns of the bottommost storey have a varying height because of inclining ground and are torsionally coupled, henceforth draw in a lot of shear forces, and without proper detailing building constructed on sloping ground is susceptible to moderate to heavy damage. In this analysis, the seismic response of three different building configurations i.e., Regular, Stepback, Stepback-Setback is evaluated. The structural analysis tool ETABS 2017 was used to perform seismic analysis utilising the linear static and dynamic methods. Buildings on a hill slope with various configurations are studied in two parts; first being: bare frame, soft storey, totally concrete blockwork infill, a soft storey with shear wall at corners, frame with composite columns at the bottommost storey and second part being: L-shear walls(LSW) at the corners, C shear-walls at core(CSW) and Reinforced concrete-filled steel tube column (RCFST) at corners and core in stepback, and stepback-setback configurations. The characteristic parameters such as base shear, forces in the columns at the ground floor, storey drift, maximum top storey displacement, time period, the bending moment in columns at every floor level and storey shear in structures will be determined and analysed for the different structures at the sloping ground. Finally, the reasonableness of various designs of slope structures would be proposed. 2021-09-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/18365 Title: RESPONCE VINDICATION OF EFFECTS OF CORNER CONFIGURATION AND INTERFERENCE ON TALL BUILDINGS UNDER WIND LOADS USING CFD MODELLING Authors: GAUR, NIKHIL Abstract: This study explores a recent application of the computational fluid dynamics technique “CFD” for wind analysis and its comparisons with the conventional wind tunnel experimentations. This study is centered on the wind response of square and corner cut-shaped building models and its optimization caused by the variation of the wind incidence angle. Extensive rigid model experiments of two building models of length scale 1:100 have been performed in the boundary layer wind tunnel. The numerical analysis has been carried out with the standard k-ε turbulence model to evaluate the force coefficients, base moments, power spectra, external surface pressure coefficients, and flow field characteristics of the models with variable wind angles of incidence. The comparisons between experimental results and CFD analysis suggest the computational approach’s viability in wind analysis of tall structures efficiently and accurately. A case study of aerodynamic mitigation by corner cut suggests minor modification techniques performance, efficiency, and limitations. Wind induced interference plays a vital role in the design of tall structures. However, the complex features of structure design and shape require a detailed wind tunnel/CFD (Computational Fluid Dynamics) study as codal provisions don’t suffice for such scattered parameters. iv The current study focuses on the effects of height ratio, orientation, and blockage configuration of interfering structure on interference effects. Interference factor (IF), transient pressure, and force spectra are used to account for the interference effects at major probe points to understand the dynamic wind response. To study these effects among complex arrangements, a numerical simulation for a CFD analysis on a corner configured principal building model and a single upstream interfering building model having identical geometry has been performed. The configuration included six kinds of heights ratio (Hr=Hprincipal/Hinterfering). Furthermore, force coefficients, base moments, and external surface pressure coefficients both in the along and across wind direction are determined and listed for wind incidence angle of attack of 0° to 90° at an interval of 15°. Interference effects among full, half, and no blockage conditions were investigated. The data is presented in terms of the interference factor relating wind load responses of the isolated principal building to interference configuration. The results indicate that in close proximity of structure, the shielding effect suppresses the interference effects on the principal building, but across wind responses have been investigated in close vicinity configurations too. This study also suggests the interfering model’s orientation contributes to great measures to the wind response under interference. 2020-08-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/18315 Title: SEISMIC PERFORMANCE OF STEEL BRACED FRAME STRUCTURES Authors: SINGH, ROHIT Abstract: The progress of steel usage has provided a significant growth in construction industry. It is well established that steel provides better ductility ,stability and strength to the structure. The structure should be good enough to withstand seismic loads as well as lateral loads. This study aims to determine that the steel braces is one of the best method to reduce seismic forces specifically knee bracing which gives most of the lateral stiffness and flexural yielding. In this context a 6 storey knee steel frame structure with a plan of 9 m *9 m is utilized. To test the results that the knee braced framed structure gives better results than the bared frame. A 6 storey knee braced steel structure has been analyzed using ETABS software based on IS 1893:2002 guidelines. Equivalent static analysis method used for calculating base shear and lateral force on each storey and compared with bare frame. ETABS software results are compared with manual results. 2020-10-01T00:00:00Z