Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item The limit of limits(School of Engineering and Technology, 2006) Babu Narayan, K.S.B.Throughout the history structural engineering has wrestled with the forces of nature and has accomplished the inspiring, daring and amazing feats of innovating structures of gigantic proportions. The tallest building on earth has crossed the 500m barrier and heights exceeding 800m are being ambitiously contemplated. Mind boggling spans for bridges are being suggested and possibilities are being investigated. At this most-happening juncture of time, this paper envisages to explore, with simple and familiar concepts, the limits of possibilities and the hurdles to be cleared to extend the limits. © 2006 by School of Engineering and Technology, Asian Institute of Technology.Item Application of Proper Orthogonal Decomposition in Concrete Performance Appraisal(Springer Science and Business Media Deutschland GmbH, 2021) Manoj, A.; Babu Narayan, K.S.B.Mould ability of concrete has made it the most versatile and popular material of construction. Workability, strength and durability of concrete are very important characteristics that depend on a large number of variables like cement and aggregate type, mix proportioning, method of mixing, conveying, placing and curing and environmental conditions of exposure like temperature, humidity, wind velocity and insolation. The degrees to which workability, strength and durability characteristics vary, and also interplay and conflicts make decision on consideration of independent variables that influence concrete performance, make the job of analysts very complex. Proper Orthogonal Decomposition (POD) is a tool that has great usage potential in reorganizing and rationalizing vast data to understand dependence, interdependence and independence of variables that affect the concrete characteristics. This paper presents the utility of Proper Orthogonal Decomposition in concrete performance appraisal. © 2021, Springer Nature Singapore Pte Ltd.Item Assessment of Pushover Response Parameters Using Response Surface Methodology(Springer Science and Business Media Deutschland GmbH, 2021) Panandikar, N.; Babu Narayan, K.S.B.Pushover analysis is a non-linear static method used for the seismic assessment of structures. The simplicity, efficiency in modelling and less computational time make this method popular. Lot of researchers has worked on conventional pushover analysis and after knowing deficiencies of the method have made efforts to improve it. From the literature, it is evident that actual experimental test results carried out so as to verify the analytically obtained pushover results are hardly available. Stress–strain models adopted for modelling of concrete and reinforcement greatly influences both the ultimate load and ultimate displacement for the structure under pushover loads. This paper focuses on assessment of pushover response parameters using response surface methodology (RSM). A three-storied RCC framed structure is tested and the experimental pushover results are available. Uncertain parameters considered include the concrete strength, steel strength, reinforcement cover and hinge location, which are randomly generated by performing stochastic analysis and their effect on responses, which include base shear and displacement is studied. Using Monte Carlo simulation in Sap-2000 design matrix is generated. Modelling and analysis of response parameters are carried out using RSM so as to obtain the characteristics of the pushover curve. The effect of material strength variation, hinge locations and hinge lengths, geometric modelling have been studied, incorporating confined model for concrete. The coefficients and equations that can be used to predict the responses are carried out by performing multiple regression analysis. The validation results demonstrated that the confined model is better than the unconfined. © 2021, Springer Nature Singapore Pte Ltd.Item The Need for Unsaturated Soil Mechanics: A Brief Review(Springer Science and Business Media Deutschland GmbH, 2021) Ujwala Shenoy, K.; Babu Narayan, K.S.B.; Sunil, B.M.Soils exhibit seasonal saturation and desiccation, often resulting in varying degrees of moisture content. In practice, soil is seldom fully saturated. When it is completely dry or wet, it behaves as a two-phase system. Otherwise, the moisture content within the interstices of soil vary, leading to partially saturated conditions. Unsaturated soil condition has significant influence on soil behaviour. This paper presents a brief review of the emergence of unsaturated soil mechanics and its applications. © 2021, Springer Nature Singapore Pte Ltd.Item Stability Analysis of Lift Shaft Tower with Guys for Wind Load(Springer Science and Business Media Deutschland GmbH, 2023) Shreekiran; Babu Narayan, K.S.B.Petroleum refinery produces coke and is one product that is enjoying huge clientele. Access to various levels of the coke-drum unit is provided by lifts and stairway. The steel tower accommodating the lift shaft and stairway is connected to the coke-drum structure proper at discrete locations. Vibration due to coke-drum operations is being transmitted to the lift/stairway shaft because of the connection, which is of concern for long-term strength, stability, and serviceability requirements. Analysis has revealed, and detachment of the shaft from coke-drum proper makes it inadequate for lateral loads. This paper presents the investigation on the possibility of employing guys to make it resistant against wind load. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.